A method and system for dynamically monitoring wear and loosening of hip joint prosthesis

Abstract

The present invention relates to the field of prosthesis monitoring, specifically a method and system for dynamically monitoring wear and loosening of hip joint prosthesis, which collects and analyzes activity data of hip joint prosthesis in the human body, determines whether the hip joint prosthesis has an activity drift event, and identifies abnormal activity parts based on the activity reset characteristics of all parts in the hip joint prosthesis; collects and analyzes the contact action state data between the surface of the abnormal activity part and other adjacent parts, obtains the interaction characteristics between the two, and thereby determines the wear state information of the surface of the abnormal activity part; collects and analyzes the liquid dynamic data between the abnormal activity part and other adjacent parts, obtains the liquid movement characteristics between the two, and thereby estimates the loosening trend information of the abnormal activity part. The present invention obtains the dynamic changes of wear and loosening of the entire hip joint prosthesis by performing force and liquid dynamic detection and analysis on the hip joint prosthesis, and accurately identifies the abnormal use of the hip joint prosthesis.

Description

[Technical field]

[0001] The present invention relates to the field of prosthesis monitoring, and in particular to a method and system for dynamically monitoring wear and loosening of hip joint prosthesis. [Background technology]

[0002] Arthroplasty is the process of replacing joints in the human body that have lost their joint function or are necrotic with artificial joint prostheses. Arthroplasty can replace corresponding joint prostheses at different joint positions of the human body, such as the knee joint, wrist joint and hip joint. Among them, the hip joint prosthesis has a larger volume and a range of freedom of movement, which places higher requirements on the installation accuracy and stability of the hip joint prosthesis inside the human body. Improper implementation of arthroplasty and / or improper use for a long time can easily cause the hip joint prosthesis to become loose and / or worn, resulting in the hip joint prosthesis being unable to restore to the correct connection position relationship with adjacent human tissue structures during movement and / or increasing the relative movement friction between the hip joint prosthesis and adjacent human tissue structures, which will affect the normal activities of the human body.

[0003] The existing technology implants an ultrasonic sensor into the hip prosthesis during the joint replacement surgery, and uses the ultrasonic sensor to detect the change in the relative distance between the hip prosthesis and the adjacent human tissue structure, thereby determining whether the hip prosthesis is loose or worn. However, the detection range of the ultrasonic sensor in the human body is limited, and it can only detect the change in the relative distance between a single point on the hip prosthesis and the adjacent human tissue structure, and cannot fully characterize the dynamic changes in the wear and loosening of the hip prosthesis as a whole in the human body. Therefore, how to perform global real-time detection of the hip prosthesis after it is implanted in the human body to obtain the dynamic changes in the wear and loosening of the hip prosthesis is of great significance for identifying abnormal use of the hip prosthesis, accurately maintaining the hip prosthesis, and preventing human joint diseases. [Summary of the invention]

[0004] In order to continuously and comprehensively detect the hip joint prosthesis after it is implanted in the human body, obtain the dynamic changes of the wear and loosening of the hip joint prosthesis as a whole, accurately identify the abnormal use of the hip joint prosthesis, and provide a reliable basis for the subsequent maintenance of the hip joint prosthesis and the prevention of human joint diseases, the present invention provides a method for dynamic monitoring of the wear and loosening of the hip joint prosthesis, which comprises the following steps:

[0005] Collecting activity data of the hip joint prosthesis in the human body, analyzing the activity data, and determining whether the hip joint prosthesis has an activity drift event; when the hip joint prosthesis has an activity drift event, identifying abnormal activity parts based on activity reset characteristics of all parts in the hip joint prosthesis;

[0006] Collecting contact action state data between the surface of the abnormally active part and other adjacent parts, analyzing the contact action state data to obtain interaction characteristics between the abnormally active part and other adjacent parts during relative motion; determining wear state information of the surface of the abnormally active part based on the interaction characteristics;

[0007] Collect liquid dynamic data between the abnormally active part and other adjacent parts, analyze the liquid dynamic data, and obtain liquid movement characteristics between the abnormally active part and other adjacent parts; based on the liquid movement characteristics, estimate the loosening trend information of the abnormally active part.

[0008] Preferably, the collecting of activity data of the hip joint prosthesis in the human body, analyzing the activity data, and determining whether the hip joint prosthesis has an activity drift event are specifically:

[0009] Collecting the activity displacement data and activity posture angle data of all parts of the hip joint prosthesis in the human body, analyzing the activity displacement data, and obtaining the displacement change data of the parts in the non-main motion direction during a single continuous activity; based on the displacement change data, determining the displacement drift rate of the parts in the non-main motion direction during a single continuous activity;

[0010] A time evolution analysis is performed on the displacement drift rate of all parts in the non-main motion direction during multiple continuous activities to determine whether the hip joint prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction during multiple continuous activities; if so, it is determined that the hip joint prosthesis has an activity drift event; if not, it is determined that the hip joint prosthesis has not experienced an activity drift event.

[0011] Preferably, when the hip joint prosthesis has a drift event, based on the activity resetting characteristics of all parts in the hip joint prosthesis, the abnormal activity parts are identified, specifically:

[0012] When the hip joint prosthesis has an activity drift event, the activity posture angle data of the part is analyzed to obtain the posture angle difference characteristics of the part corresponding to the activity start time point and the activity end time point during a single reciprocating activity process, which is used as the activity reset characteristic of the part; based on the posture angle difference characteristics, it is determined whether the part is an abnormal activity part.

[0013] Preferably, the contact action state data between the surface of the abnormally active part and other adjacent parts are collected, and the contact action state data are analyzed to obtain the interaction characteristics between the abnormally active part and other adjacent parts during the relative movement between the abnormally active part and other adjacent parts; based on the interaction characteristics, the wear state information of the surface of the abnormally active part is determined, specifically:

[0014] Collecting data on the contact pressure applied to the surface of the abnormally active part by other adjacent parts; wherein the contact pressure applied to the surface of the abnormally active part by other adjacent parts includes data on the magnitude and direction of the pressure applied to the entire surface of the abnormally active part by other adjacent parts;

[0015] Based on the contact pressure action state data and the curvature distribution data of the surface of the abnormal activity part, the friction force characteristics of the surface of the abnormal activity part during the relative movement between the abnormal activity part and other adjacent parts are obtained, and used as the interaction characteristics; wherein the friction force characteristics include the distribution characteristics of the magnitude of the friction force on the surface of the abnormal activity part;

[0016] Based on the friction force characteristics of the surface of the abnormal activity part, the friction force mutation area on the surface of the abnormal activity part is determined; based on the friction force change gradient in the friction force mutation area, the wear range and wear degree of the surface of the abnormal activity part are estimated.

[0017] Preferably, the liquid dynamic data between the abnormally active part and other adjacent parts are collected, and the liquid dynamic data are analyzed to obtain the liquid movement characteristics between the abnormally active part and other adjacent parts; based on the liquid movement characteristics, the loosening trend information of the abnormally active part is estimated, specifically:

[0018] Collecting liquid pressure data and liquid flow rate data between the abnormally active part and other adjacent parts; performing time change analysis on the liquid pressure data and the liquid flow rate data to obtain the liquid pressure change characteristics and liquid flow rate change characteristics between the abnormally active part and other adjacent parts during any two adjacent hip joint prosthesis activities;

[0019] Based on the liquid pressure variation characteristics and the liquid flow velocity variation characteristics, the variation trend of the gap space range between the abnormal activity part and other adjacent parts is determined, so as to estimate the loose displacement size and direction variation trend of the abnormal activity part.

[0020] On the other hand, the present invention provides a dynamic monitoring system for wear and loosening of hip joint prosthesis, the system comprising the following modules:

[0021] An activity data collection and analysis module is used to collect activity data of the hip joint prosthesis in the human body, analyze the activity data, and determine whether an activity drift event occurs in the hip joint prosthesis;

[0022] An abnormal activity part identification module is used to identify the abnormal activity part based on the activity reset characteristics of all parts in the hip joint prosthesis when the hip joint prosthesis has an activity drift event;

[0023] A part interaction determination module is used to collect contact action state data between the surface of the abnormal activity part and other adjacent parts, analyze the contact action state data, and obtain the interaction characteristics between the abnormal activity part and other adjacent parts during the relative movement between the two parts;

[0024] A part wear state determination module, used for determining wear state information of the surface of the abnormal activity part based on the interaction characteristics;

[0025] A liquid movement characteristic determination module is used to collect liquid dynamic data between the abnormal activity site and other adjacent sites, analyze the liquid dynamic data, and obtain liquid movement characteristics between the abnormal activity site and other adjacent sites;

[0026] The loosening trend module is used to estimate the loosening trend information of the abnormally active part based on the fluid movement characteristics.

[0027] Preferably, the activity data collection and analysis module is used to collect activity data of the hip joint prosthesis in the human body, analyze the activity data, and determine whether the hip joint prosthesis has an activity drift event, specifically:

[0028] Collecting the activity displacement data and activity posture angle data of all parts of the hip joint prosthesis in the human body, analyzing the activity displacement data, and obtaining the displacement change data of the parts in the non-main motion direction during a single continuous activity; based on the displacement change data, determining the displacement drift rate of the parts in the non-main motion direction during a single continuous activity;

[0029] A time evolution analysis is performed on the displacement drift rate of all parts in the non-main motion direction during multiple continuous activities to determine whether the hip joint prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction during multiple continuous activities; if so, it is determined that the hip joint prosthesis has an activity drift event; if not, it is determined that the hip joint prosthesis has not experienced an activity drift event.

[0030] Preferably, the abnormal activity part identification module is used to identify the abnormal activity part based on the activity reset characteristics of all parts in the hip joint prosthesis when the hip joint prosthesis has an activity drift event, specifically:

[0031] When the hip joint prosthesis has an activity drift event, the activity posture angle data of the part is analyzed to obtain the posture angle difference characteristics of the part corresponding to the activity start time point and the activity end time point during a single reciprocating activity process, which is used as the activity reset characteristic of the part; based on the posture angle difference characteristics, it is determined whether the part is an abnormal activity part.

[0032] Preferably, the part interaction determination module is used to collect contact action state data between the surface of the abnormal activity part and other adjacent parts, analyze the contact action state data, and obtain the interaction characteristics between the abnormal activity part and other adjacent parts during the relative movement, specifically:

[0033] Collecting data on the contact pressure applied to the surface of the abnormally active part by other adjacent parts; wherein the contact pressure applied to the surface of the abnormally active part by other adjacent parts includes data on the magnitude and direction of the pressure applied to the entire surface of the abnormally active part by other adjacent parts;

[0034] Based on the contact pressure action state data and the curvature distribution data of the surface of the abnormal activity part, the friction force characteristics of the surface of the abnormal activity part during the relative movement between the abnormal activity part and other adjacent parts are obtained, and used as the interaction characteristics; wherein the friction force characteristics include the distribution characteristics of the magnitude of the friction force on the surface of the abnormal activity part;

[0035] The part wear state determination module is used to determine the wear state information of the surface of the abnormal activity part based on the interaction characteristics, specifically:

[0036] Based on the friction force characteristics of the surface of the abnormal activity part, the friction force mutation area on the surface of the abnormal activity part is determined; based on the friction force change gradient in the friction force mutation area, the wear range and wear degree of the surface of the abnormal activity part are estimated.

[0037] Preferably, the liquid movement characteristic determination module is used to collect liquid dynamic data between the abnormal activity site and other adjacent sites, analyze the liquid dynamic data, and obtain the liquid movement characteristics between the abnormal activity site and other adjacent sites, specifically:

[0038] Collecting liquid pressure data and liquid flow rate data between the abnormally active part and other adjacent parts; performing time change analysis on the liquid pressure data and the liquid flow rate data to obtain the liquid pressure change characteristics and liquid flow rate change characteristics between the abnormally active part and other adjacent parts during any two adjacent hip joint prosthesis activities;

[0039] The loosening trend module is used to estimate the loosening trend information of the abnormally active part based on the liquid movement characteristics, specifically:

[0040] Based on the liquid pressure variation characteristics and the liquid flow velocity variation characteristics, the variation trend of the gap space range between the abnormal activity part and other adjacent parts is determined, so as to estimate the loose displacement size and direction variation trend of the abnormal activity part.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The activity data of the hip prosthesis in the human body is collected and analyzed to determine whether the hip prosthesis has an activity drift event; when the hip prosthesis has an activity drift event, the abnormal activity part is identified based on the activity reduction characteristics of all parts in the hip prosthesis. The hip prosthesis mainly includes the femoral neck, femoral stem, ball head and acetabulum. When the hip prosthesis is replaced in the human body through joint replacement, all parts of the hip prosthesis will be installed in the human body and adjacent to other tissue structures in the human body. If there are errors in the implementation of joint replacement or the hip prosthesis is not used correctly after being installed in the human body, it will cause the hip prosthesis to shift and dislocate in the human body, which will not only affect the normal activity of the human body through the hip prosthesis, but also cause friction and wear between the hip prosthesis and other tissue structures, thereby causing wear and loosening of the hip prosthesis during subsequent use, seriously affecting the service life of the hip prosthesis. Once the hip prosthesis is displaced in the human body, it will inevitably make it impossible for the human body to perform precise and stable movements through the hip prosthesis. For example, unnecessary interference movements such as shaking and vibration will occur during the movement. And as the displacement and dislocation of the hip prosthesis in the human body accumulate over a long period of time, the amplitude and frequency of shaking and vibration during human activities will continue to increase. It can be seen that based on whether shaking and vibration and other phenomena occur when the human body performs activities involving the hip prosthesis, it can be judged whether the hip prosthesis is worn and / or loose in the human body.

[0043] Specifically, displacement sensors and triaxial acceleration sensors pre-set at different parts of the hip joint prosthesis can be used to detect the activity displacement data and activity posture angle data of each part in the human body, respectively, and the activity amplitude and angle of all parts in the hip joint prosthesis can be comprehensively and continuously detected. When the hip joint prosthesis does not have problems such as displacement and dislocation in the human body, the activity displacement data of each part only includes displacement data in a single main motion direction; when the hip joint prosthesis has problems such as displacement and dislocation in the human body, the activity displacement data of each part will simultaneously include displacement data in the main motion direction and the non-main motion direction, and the displacement of each part in the non-main motion direction directly forms the above-mentioned shaking vibration. From the activity displacement data of each part, the displacement change data of each part in the non-main motion direction during a single continuous activity is extracted, such as the displacement size and direction change data in the non-main motion direction, and the above displacement change data is analyzed in the time domain to determine the displacement drift rate of each part in the non-main motion direction during a single continuous activity. The displacement drift rate of a single part in the hip prosthesis in the non-main motion direction cannot truly and comprehensively reflect whether the entire hip prosthesis has an active drift event. Therefore, a time evolution analysis of the displacement drift rate of all parts in the hip prosthesis in the non-main motion direction during multiple continuous activities is performed to determine whether the entire hip prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction, thereby accurately judging whether the hip prosthesis has an active drift event, providing a basis for subsequent identification of abnormal active parts in the hip prosthesis.

[0044] When it is determined that the hip joint prosthesis has an activity drift event, it indicates that the hip joint prosthesis as a whole has been displaced in the human body. In view of the fact that the hip joint prosthesis includes parts such as the femoral neck, femoral stem, ball head and acetabulum, it is necessary to further determine the abnormal activity part. Specifically, when there is abnormal activity in a certain part of the hip joint prosthesis, the above-mentioned part will not be able to return to the original posture angle during a single reciprocating activity, that is, the posture angle of the above-mentioned part corresponding to the activity start time point and the activity end time point during a single reciprocating activity is not the same, that is to say, the above-mentioned part cannot be accurately reset to the original posture angle state. By analyzing the activity posture angle data of the part, the difference characteristics of the posture angle of the part corresponding to the activity start time point and the activity end time point during a single reciprocating activity are obtained, and all parts of the hip joint prosthesis can be screened one by one to see if there are abnormal activities, which is convenient for subsequent independent wear and loosening monitoring of each part.

[0045] The contact state data between the surface of the abnormally active part and other adjacent parts are collected, and the contact state data are analyzed to obtain the interaction characteristics between the abnormally active part and other adjacent parts during the relative movement; based on the interaction characteristics, the wear state information of the surface of the abnormally active part is determined. When there is abnormal activity in a part of the hip joint prosthesis, the above-mentioned part and other adjacent parts will not be able to maintain the original normal position relationship but will be dislocated. At this time, the above-mentioned part and other adjacent parts will not be able to maintain the original normal contact state. For example, the relative contact azimuth between other adjacent parts and the above-mentioned part changes, so that the size and direction of the contact pressure applied by other adjacent parts to the above-mentioned part also change accordingly, and then the friction force between other adjacent parts and the surface of the above-mentioned part also changes. When the friction force on the surface of the above-mentioned part exceeds the threshold range of the friction force that it can bear, the surface of the above-mentioned part will be worn, so that the shape of the surface of the above-mentioned part changes and it can no longer maintain benign contact with other adjacent parts, thereby hindering the activity of the hip joint prosthesis and shortening the service life of the hip joint prosthesis. The wear range and degree of the surface of the above-mentioned parts depend on the state of the friction force on the surface of the above-mentioned parts, and the increase in the wear range and the aggravation of the wear degree of the above-mentioned parts will in turn affect the state of the friction force on the surface of the above-mentioned parts. The two are mutually influential and have corresponding correlations. To this end, the pressure sensor pre-set on the surface of the internal part of the hip joint prosthesis can be used to detect the contact pressure state data with other adjacent parts, and combined with the curvature distribution data of the surface of the abnormal activity part, the friction force characteristics of the surface of the abnormal activity part can be determined, and based on the above-mentioned friction force characteristics, the wear range and degree of the surface of the abnormal activity part are estimated. Compared with the existing technology using ultrasonic detection, it can perform global wear state detection on the surface of the abnormal activity part, improve the accurate quantitative determination of the wear range and wear degree of the hip joint prosthesis, and provide a comprehensive and accurate basis for identifying the overall wear condition of the hip joint prosthesis.

[0046] Collect the liquid dynamic data between the abnormally active part and other adjacent parts, analyze the liquid dynamic data, and obtain the liquid movement characteristics between the abnormally active part and other adjacent parts; based on the liquid movement characteristics, estimate the loosening trend information of the abnormally active part. All parts and other adjacent parts in the hip joint prosthesis are filled with liquids such as tissue fluid, which play a buffering and lubricating role between different parts. When the abnormally active part in the hip joint prosthesis loosens, the gap space between the abnormally active part and other adjacent parts will become larger accordingly, and the tissue fluid flowing into the above-mentioned gap space will also increase, and the flow rate of the tissue fluid in the above-mentioned gap space will also increase. As the degree of loosening of the abnormally active part increases, the pressure and flow rate of the liquid in the above-mentioned gap space will also change. By collecting and analyzing the pressure and flow velocity data of the liquid in the above-mentioned gap space, the looseness of the abnormal activity part can be identified quickly and accurately; and the liquid is filled in the global range of the above-mentioned gap space, and by detecting the liquid pressure and flow velocity at different positions in the above-mentioned gap space, the looseness degree of different positions of the abnormal activity part can be distinguished and identified. Compared with the existing technology that uses ultrasonic detection to measure only the looseness state of a single position inside the hip joint prosthesis, the full-range detection of the liquid in the above-mentioned gap space can realize the identification of the looseness state of the entire hip joint prosthesis. Specifically, the liquid pressure sensor and liquid flow rate sensor pre-installed on the surface of the inner part of the hip joint prosthesis can detect the liquid pressure data and liquid fluid velocity data between it and other adjacent parts, so as to determine the liquid pressure change characteristics and liquid flow rate change characteristics between the abnormal activity part and other adjacent parts, and combine the relationship between the liquid pressure and flow rate between the abnormal activity part and other adjacent parts and the size of the gap space between the abnormal activity part and other adjacent parts to determine the change trend of the gap space range between the abnormal activity part and other adjacent parts, so as to estimate the loosening displacement size and direction change trend of the abnormal activity part, so as to realize the identification of the loosening state of the hip joint prosthesis as a whole.

Brief Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0048] Figure 1 The present invention provides a flowchart of a method for dynamically monitoring wear and loosening of a hip joint prosthesis.

[0049] Figure 2 It is a structural diagram of a hip joint prosthesis wear and loosening dynamic monitoring system provided by the present invention. [Specific implementation method]

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention rather than all structures are shown in the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0051] The terms "including" and "having" and any variations thereof in the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0052] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] See also Figure 1 As shown, the present invention provides a method for dynamically monitoring wear and loosening of hip joint prosthesis, the method comprising the following steps:

[0054] S100, collecting activity data of the hip joint prosthesis in the human body, analyzing the activity data, and determining whether an activity drift event occurs in the hip joint prosthesis; when an activity drift event occurs in the hip joint prosthesis, identifying abnormal activity parts based on activity resetting characteristics of all parts in the hip joint prosthesis.

[0055] Furthermore, the activity data of the hip joint prosthesis in the human body is collected and analyzed to determine whether the hip joint prosthesis has an activity drift event, specifically:

[0056] Collect the activity displacement data and activity posture angle data of all parts of the hip joint prosthesis in the human body, analyze the activity displacement data, and obtain the displacement change data of the parts in the non-main movement direction during a single continuous movement; based on the displacement change data, determine the displacement drift rate of the parts in the non-main movement direction during a single continuous movement;

[0057] The time evolution analysis of the displacement drift rate of all parts in the non-main motion direction during multiple continuous activities is performed to determine whether the hip prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction during multiple continuous activities; if so, it is judged that the hip prosthesis has an activity drift event; if not, it is judged that the hip prosthesis has not experienced an activity drift event.

[0058] Hip prosthesis mainly includes femoral neck, femoral stem, ball head and acetabulum. Hip replacement is to replace the original hip joint in the human body with a hip prosthesis. After the hip prosthesis is replaced in the human body, all parts of the hip prosthesis will be installed in the corresponding position in the human body and adjacent to other tissue structures in the human body (such as other bone structures). If there are errors in the surgical operation during the implementation of hip replacement or the hip prosthesis is not used correctly after being installed in the human body (for example, the hip prosthesis bears too much load during the activity), it will cause the hip prosthesis to shift and dislocate inside the human body. This shift and dislocation will continue to increase with the continuous activity of the hip prosthesis, causing the hip prosthesis to wear and / or loosen. It can be seen that the shift and dislocation of the parts in the hip prosthesis is a necessary stage for wear and / or loosening. Therefore, by identifying the parts of the hip prosthesis that are shifted and dislocated, it is convenient to identify the area where the hip prosthesis is worn and / or loosened in a targeted manner. Once any part of the hip prosthesis is displaced, it will inevitably make it impossible for the human body to perform precise and stable movements through the hip prosthesis. For example, unnecessary interference movements such as shaking and vibration will occur during the movement. And as the displacement and dislocation of the hip prosthesis in the human body accumulate over a long period of time, the amplitude and frequency of shaking and vibration during human activities will continue to increase. It can be seen that based on whether shaking and vibration will occur when the human body performs activities involving the hip prosthesis, the parts of the hip prosthesis that have been displaced can be preliminarily screened, and then the area range can be accurately limited for the subsequent identification of wear and loosening of the hip prosthesis.

[0059] In actual operation, all parts of the hip prosthesis are equipped with displacement sensors and triaxial acceleration sensors. These sensors will be implanted into the human body at the same time as the hip replacement surgery, and will synchronously detect the activity displacement data and activity posture data of each part in the human body during the activity of the hip prosthesis, and conduct comprehensive and continuous detection of the activity service and activity angle of all parts in the hip prosthesis during the activity. When the hip prosthesis does not have problems such as displacement and dislocation in the human body, the activity displacement data of each part only includes displacement data of a single main motion direction, wherein the above-mentioned single main motion direction refers to the motion direction corresponding to the motion performed by the part in cooperation with the activity of the hip prosthesis; when the hip prosthesis has problems such as displacement and dislocation in the human body, the activity displacement data of each part will include displacement data of the main motion direction and the non-main motion direction at the same time, wherein the displacement of each part in the non-main motion direction directly forms the above-mentioned shaking vibration, and the above-mentioned non-main motion direction has a certain angle with the above-mentioned main motion direction. From the activity displacement data of each part, the displacement change data of each part in the non-main movement direction during a single continuous activity, such as the change data of the displacement size and direction in the non-main movement direction, are extracted, and the time domain change analysis is performed on the above displacement change data to determine the displacement drift rate of each part in the non-main movement direction during a single continuous activity. The displacement drift rate refers to the displacement fluctuation change rate of each part in the non-main movement direction during a single continuous activity. The larger the displacement drift rate, the greater the shaking vibration amplitude of the corresponding part during a single continuous activity. The displacement drift rate of a single part in the hip prosthesis in the non-main motion direction cannot truly and comprehensively reflect whether the entire hip prosthesis has an active drift event. Therefore, a time evolution analysis of the displacement drift rate of all parts in the hip prosthesis in the non-main motion direction during multiple continuous activities is performed to determine whether the entire hip prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction, so as to accurately judge whether the hip prosthesis has an active drift event. Specifically, if the entire hip prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction, it is judged that the hip prosthesis has an active drift event; otherwise, it is judged that the hip prosthesis has not undergone an active drift event, which provides a basis for subsequent identification of abnormal active parts in the hip prosthesis.

[0060] Furthermore, when a hip joint prosthesis drifts, the abnormal movement parts are identified based on the movement reduction characteristics of all parts in the hip joint prosthesis, specifically:

[0061] When a hip joint prosthesis drifts, the activity posture angle data of the part is analyzed to obtain the posture angle difference characteristics corresponding to the start time point and the end time point of the activity during a single reciprocating activity of the part, which is used as the activity resetting characteristic of the part; based on the posture angle difference characteristics, it is determined whether the part is an abnormal activity part.

[0062] When it is determined that the hip joint prosthesis has an activity drift event, it indicates that the hip joint prosthesis as a whole has been displaced in the human body. In view of the fact that the hip joint prosthesis includes parts such as the femoral neck, femoral stem, ball head and acetabulum, it is necessary to further determine the abnormal activity part. Specifically, when there is abnormal activity in a certain part of the hip joint prosthesis, the above-mentioned part will not be able to return to the original posture angle during a single reciprocating activity, that is, the posture angle of the above-mentioned part corresponding to the activity start time point and the activity end time point during a single reciprocating activity is not the same, that is to say, the above-mentioned part cannot be accurately reset to the original posture angle state. When there is abnormal activity in a certain part of the hip joint prosthesis due to displacement and dislocation, the above-mentioned part cannot return to the original posture angle state at the end of each activity during a single reciprocating activity (such as a single retraction and extension reciprocating activity process), thereby affecting the smoothness and flexibility of the overall activity of the hip joint prosthesis. To this end, by analyzing the activity posture angle data of the parts, the posture angle difference characteristics (i.e., posture angle difference value) of the parts during a single reciprocating activity corresponding to the start time point and the end time point of the activity are obtained, so that all parts in the hip joint prosthesis can be screened one by one to see if there are any abnormal activities. When the above posture angle difference value exceeds the preset angle difference threshold, it is determined that there is abnormal activity in the corresponding part; otherwise, it is determined that there is no abnormal activity in the corresponding part, which is convenient for subsequent independent wear and loosening monitoring of each part, and the overall wear and loosening of the hip joint prosthesis can be quickly and accurately determined.

[0063] S200, collecting contact action state data between the surface of the abnormal active part and other adjacent parts, analyzing the contact action state data, and obtaining interaction characteristics between the abnormal active part and other adjacent parts during relative movement; based on the interaction characteristics, determining wear state information of the surface of the abnormal active part.

[0064] Furthermore, the contact state data between the surface of the abnormal active part and other adjacent parts are collected, and the contact state data are analyzed to obtain the interaction characteristics between the abnormal active part and other adjacent parts during the relative motion between the two parts; based on the interaction characteristics, the wear state information of the surface of the abnormal active part is determined, specifically:

[0065] Collecting data on the contact pressure applied to the surface of the abnormally active part from other adjacent parts; wherein the contact pressure applied to the surface of the abnormally active part includes data on the magnitude and direction of the pressure applied to the entire surface of the abnormally active part from other adjacent parts;

[0066] Based on the contact pressure action state data and the curvature distribution data of the surface of the abnormally moving part, the friction force characteristics of the surface of the abnormally moving part during the relative movement between the abnormally moving part and other adjacent parts are obtained as the interaction characteristics; wherein the friction force characteristics include the distribution characteristics of the magnitude of the friction force on the surface of the abnormally moving part;

[0067] Based on the friction force characteristics of the surface of the abnormal activity part, the friction force mutation area on the surface of the abnormal activity part is determined; based on the friction force change gradient in the friction force mutation area, the wear range and wear degree of the surface of the abnormal activity part are estimated.

[0068] When there is abnormal movement of a part in the hip joint prosthesis, the above-mentioned part and other adjacent parts will not be able to maintain the original normal position relationship but will be dislocated. At this time, the above-mentioned part and other adjacent parts will not be able to maintain the original normal contact state. For example, the relative contact azimuth between other adjacent parts and the above-mentioned part changes, so that the size and direction of the contact pressure applied by other adjacent parts on the above-mentioned part also change accordingly, and then the friction force between other adjacent parts and the surface of the above-mentioned part also changes. When the friction force on the surface of the above-mentioned part exceeds the threshold range of the friction force that it can bear, the surface of the above-mentioned part will wear, so that the shape of the surface of the above-mentioned part changes and it can no longer maintain benign contact with other adjacent parts, thereby hindering the movement of the hip joint prosthesis and shortening the service life of the hip joint prosthesis. The wear range and degree of the surface of the above-mentioned part depend on the state of the friction force on the surface of the above-mentioned part, and the increase in the wear range and the increase in the degree of wear on the surface of the above-mentioned part will in turn affect the state of the friction force on the surface of the above-mentioned part. The two are mutually influential and have corresponding correlations. To this end, the contact pressure state data between the abnormal part and other adjacent parts can be detected by using a pressure sensor (such as a thin film pressure sensor) pre-set on the surface of the internal part of the hip joint prosthesis. When the contact pressure of the same magnitude and direction is applied to areas with different curvatures on the surface of the abnormal part, the friction forces on different areas are also different accordingly. In order to accurately determine the magnitude and direction of the friction force on different areas of the surface of the abnormal part, the friction force characteristics of the abnormal part are obtained based on the contact pressure state data and the curvature distribution data of the surface of the abnormal part. The friction force characteristics of the abnormal part surface during the relative movement between the abnormal part and other adjacent parts are obtained, thereby accurately determining the magnitude distribution of the friction force on the global range of the surface of the abnormal part.

[0069] In fact, the wear state of the surface of the abnormal part of the activity, such as the wear range and wear degree, is interrelated and mutually influenced with the magnitude of the friction force on the surface of the abnormal part of the activity. When the friction force on the surface of the abnormal part of the activity is greater, the erosion effect of these friction forces on the surface of the abnormal part of the activity is more obvious, and the wear of the surface of the abnormal part of the activity is aggravated; when the wear range and / or wear degree of the surface of the abnormal part of the activity is greater, the roughness of the surface of the abnormal part of the activity is greater, and the friction force applied to the surface of the abnormal part of the activity during the relative movement of the surface of the abnormal part of the activity with other adjacent parts is also greater. Based on the relationship between the wear range and wear degree of the surface of the abnormal part of the activity and the distribution of the magnitude of the friction force on the surface of the abnormal part of the activity, the surface space change of the friction force distribution characteristics obtained above on the surface of the abnormal part of the activity is identified, and the friction force mutation area on the surface of the abnormal part of the activity is determined, wherein the average friction force value in the above friction force mutation area is 2 times or more of the average friction force value of other surface areas, so that the above friction force mutation area is regarded as the area with greater wear on the surface of the abnormal part of the activity. Based on the friction force change gradient in the friction force mutation area, that is, the rate of change of the friction force per unit distance in different directions in the friction force mutation area, the wear range and degree of the surface of the abnormal activity part are estimated, wherein the greater the friction force change gradient, the greater the wear degree of the corresponding position. Compared with the existing technology using ultrasonic detection, it can perform global wear state detection on the surface of the abnormal activity part, improve the accurate quantitative determination of the wear range and degree of the hip prosthesis, and provide a comprehensive and accurate basis for identifying the overall wear condition of the hip prosthesis.

[0070] S300, collecting liquid dynamic data between the abnormally active part and other adjacent parts, analyzing the liquid dynamic data, obtaining liquid movement characteristics between the abnormally active part and other adjacent parts; based on the liquid movement characteristics, estimating loosening trend information of the abnormally active part.

[0071] Furthermore, the fluid dynamic data between the abnormally active part and other adjacent parts are collected, and the fluid dynamic data are analyzed to obtain the fluid movement characteristics between the abnormally active part and other adjacent parts; based on the fluid movement characteristics, the loosening trend information of the abnormally active part is estimated, specifically:

[0072] Collecting liquid pressure data and liquid flow velocity data between the abnormally active part and other adjacent parts; analyzing the time variation of the liquid pressure data and the liquid flow velocity data to obtain the liquid pressure variation characteristics and liquid flow velocity variation characteristics between the abnormally active part and other adjacent parts during any two adjacent hip joint prosthesis activities;

[0073] Based on the characteristics of liquid pressure change and liquid flow velocity change, the change trend of the gap space range between the abnormal activity part and other adjacent parts is determined, so as to estimate the loose displacement size and direction change trend of the abnormal activity part.

[0074] All parts of the hip joint prosthesis and other adjacent parts are filled with liquids such as tissue fluid, which play a buffering and lubricating role between different parts. When the abnormal activity part in the hip joint prosthesis is loose, the gap space between the abnormal activity part and other adjacent parts will become larger accordingly, the tissue fluid flowing into the above gap space will also increase, and the flow rate of the tissue fluid in the above gap space will also increase. As the degree of loosening of the abnormal activity part increases, the pressure and flow rate of the liquid in the above gap space will also change. By collecting and analyzing the pressure and flow rate data of the liquid in the above gap space, the loosening of the abnormal activity part can be quickly and accurately identified; and the liquid is filled in the global range of the above gap space, by detecting the liquid pressure and flow rate at different positions in the above gap space, the degree of loosening of different positions of the abnormal activity part can be distinguished and identified. Compared with the existing technology that can only measure the loosening state of a single position on the internal part of the hip joint prosthesis using ultrasonic detection, the full range detection of the liquid in the above gap space can realize the identification of the loosening state of the entire hip joint prosthesis.

[0075] Specifically, the liquid pressure sensor and the liquid flow rate sensor pre-installed on the surface of the inner part of the hip joint prosthesis can detect the liquid pressure data and the liquid fluid velocity data between it and other adjacent parts, so as to determine the liquid pressure change characteristics and the liquid flow rate change characteristics between the abnormal activity part and other adjacent parts, and combine the relationship between the liquid pressure and flow rate between the abnormal activity part and other adjacent parts and the size of the gap space between the abnormal activity part and other adjacent parts to determine the change trend of the gap space range between the abnormal activity part and other adjacent parts, so as to estimate the loosening displacement size and direction change trend of the abnormal activity part, so as to realize the identification of the loosening state of the hip joint prosthesis as a whole.

[0076] See also Figure 2 As shown, the present invention provides a dynamic monitoring system for hip joint prosthesis wear and loosening, which includes the following modules:

[0077] The activity data collection and analysis module is used to collect the activity data of the hip joint prosthesis in the human body, analyze the activity data, and determine whether the hip joint prosthesis has an activity drift event;

[0078] The abnormal activity part identification module is used to identify the abnormal activity part based on the activity reset characteristics of all parts in the hip joint prosthesis when the hip joint prosthesis has an activity drift event;

[0079] The part interaction determination module is used to collect the contact action state data between the surface of the abnormal activity part and other adjacent parts, analyze the contact action state data, and obtain the interaction characteristics between the abnormal activity part and other adjacent parts during the relative motion;

[0080] A part wear state determination module is used to determine the wear state information of the surface of the abnormal activity part based on the interaction characteristics;

[0081] A liquid movement characteristic determination module is used to collect liquid dynamic data between the abnormal activity site and other adjacent sites, analyze the liquid dynamic data, and obtain liquid movement characteristics between the abnormal activity site and other adjacent sites;

[0082] The loosening trend module of the parts is used to estimate the loosening trend information of the abnormally active parts based on the liquid movement characteristics.

[0083] Furthermore, the activity data collection and analysis module is used to collect activity data of the hip joint prosthesis in the human body, analyze the activity data, and determine whether the hip joint prosthesis has an activity drift event, specifically:

[0084] Collect the activity displacement data and activity posture angle data of all parts of the hip joint prosthesis in the human body, analyze the activity displacement data, and obtain the displacement change data of the parts in the non-main movement direction during a single continuous movement; based on the displacement change data, determine the displacement drift rate of the parts in the non-main movement direction during a single continuous movement;

[0085] The time evolution analysis of the displacement drift rate of all parts in the non-main motion direction during multiple continuous activities is performed to determine whether the hip prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction during multiple continuous activities; if so, it is judged that the hip prosthesis has an activity drift event; if not, it is judged that the hip prosthesis has not experienced an activity drift event.

[0086] Furthermore, the abnormal activity part identification module is used to identify the abnormal activity part based on the activity reset characteristics of all parts in the hip joint prosthesis when the hip joint prosthesis has an activity drift event, specifically:

[0087] When the hip joint prosthesis has an activity drift event, the activity posture angle data of the part is analyzed to obtain the posture angle difference characteristics of the part corresponding to the activity start time point and the activity end time point during a single reciprocating activity process, which is used as the activity reset feature of the part; based on the posture angle difference characteristics, it is determined whether the part is an abnormal activity part.

[0088] Furthermore, the part interaction determination module is used to collect the contact state data between the surface of the abnormal activity part and other adjacent parts, analyze the contact state data, and obtain the interaction characteristics between the abnormal activity part and other adjacent parts during the relative motion, specifically:

[0089] Collecting data on the contact pressure applied to the surface of the abnormally active part from other adjacent parts; wherein the contact pressure applied to the surface of the abnormally active part includes data on the magnitude and direction of the pressure applied to the entire surface of the abnormally active part from other adjacent parts;

[0090] Based on the contact pressure action state data and the curvature distribution data of the surface of the abnormally moving part, the friction force characteristics of the surface of the abnormally moving part during the relative movement between the abnormally moving part and other adjacent parts are obtained as the interaction characteristics; wherein the friction force characteristics include the distribution characteristics of the magnitude of the friction force on the surface of the abnormally moving part;

[0091] The wear state determination module is used to determine the wear state information of the surface of the abnormal activity part based on the interaction characteristics, specifically:

[0092] Based on the friction force characteristics of the surface of the abnormal activity part, the friction force mutation area on the surface of the abnormal activity part is determined; based on the friction force change gradient in the friction force mutation area, the wear range and wear degree of the surface of the abnormal activity part are estimated.

[0093] Furthermore, the liquid movement feature determination module is used to collect liquid dynamic data between the abnormal activity site and other adjacent sites, analyze the liquid dynamic data, and obtain the liquid movement features between the abnormal activity site and other adjacent sites, specifically:

[0094] Collecting liquid pressure data and liquid flow velocity data between the abnormally active part and other adjacent parts; analyzing the time variation of the liquid pressure data and the liquid flow velocity data to obtain the liquid pressure variation characteristics and liquid flow velocity variation characteristics between the abnormally active part and other adjacent parts during any two adjacent hip joint prosthesis activities;

[0095] The loosening trend module is used to estimate the loosening trend information of abnormally active parts based on the liquid movement characteristics, specifically:

[0096] Based on the characteristics of liquid pressure change and liquid flow velocity change, the change trend of the gap space range between the abnormal activity part and other adjacent parts is determined, so as to estimate the loose displacement size and direction change trend of the abnormal activity part.

[0097] The operation and effect of the hip joint prosthesis wear and loosening dynamic monitoring system of the present invention are corresponding to and consistent with the above-mentioned hip joint prosthesis wear and loosening dynamic monitoring method, and the hip joint prosthesis wear and loosening dynamic monitoring system will not be repeated here.

[0098] Through the description of the above implementation methods, technicians in this field can clearly understand that each implementation method can be implemented by adding a necessary general hardware platform, and of course can also be implemented by combining hardware and software. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a computer product, and the present invention can be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it, and other embodiments may also be used. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for dynamically monitoring wear and loosening of hip joint prosthesis, characterized in that: The method comprises the following steps: Collecting activity data of the hip joint prosthesis in the human body, analyzing the activity data, and determining whether the hip joint prosthesis has an activity drift event; when the hip joint prosthesis has an activity drift event, identifying abnormal activity parts based on activity reset characteristics of all parts in the hip joint prosthesis; Collecting contact action state data between the surface of the abnormally active part and other adjacent parts, analyzing the contact action state data to obtain interaction characteristics between the abnormally active part and other adjacent parts during relative motion; determining wear state information of the surface of the abnormally active part based on the interaction characteristics; Collect liquid dynamic data between the abnormally active part and other adjacent parts, analyze the liquid dynamic data, and obtain liquid movement characteristics between the abnormally active part and other adjacent parts; based on the liquid movement characteristics, estimate the loosening trend information of the abnormally active part.

2. The method according to claim 1, characterized in that The collecting of activity data of the hip joint prosthesis in the human body, analyzing the activity data, and determining whether the hip joint prosthesis has an activity drift event, specifically comprises: Collecting the activity displacement data and activity posture angle data of all parts of the hip joint prosthesis in the human body, analyzing the activity displacement data, and obtaining the displacement change data of the parts in the non-main motion direction during a single continuous activity; based on the displacement change data, determining the displacement drift rate of the parts in the non-main motion direction during a single continuous activity; A time evolution analysis is performed on the displacement drift rate of all parts in the non-main motion direction during multiple continuous activities to determine whether the hip joint prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction during multiple continuous activities; if so, it is determined that the hip joint prosthesis has an activity drift event; if not, it is determined that the hip joint prosthesis has not experienced an activity drift event.

3. The method according to claim 2, characterized in that When the hip joint prosthesis has a drift event, based on the activity reset characteristics of all parts in the hip joint prosthesis, the abnormal activity parts are identified, specifically: When the hip joint prosthesis has an activity drift event, the activity posture angle data of the part is analyzed to obtain the posture angle difference characteristics of the part corresponding to the activity start time point and the activity end time point during a single reciprocating activity process, which is used as the activity reset feature of the part; Based on the posture angle difference characteristics, determine whether the part is an abnormally active part.

4. The method according to claim 1, characterized in that: The step of collecting contact state data between the surface of the abnormally active part and other adjacent parts, analyzing the contact state data, and obtaining interaction characteristics between the abnormally active part and other adjacent parts during relative motion; and determining wear state information of the surface of the abnormally active part based on the interaction characteristics, is specifically: Collecting data on the contact pressure applied to the surface of the abnormally active part by other adjacent parts; wherein the contact pressure applied to the surface of the abnormally active part by other adjacent parts includes data on the magnitude and direction of the pressure applied to the entire surface of the abnormally active part by other adjacent parts; Based on the contact pressure action state data and the curvature distribution data of the surface of the abnormal activity part, the friction force characteristics of the surface of the abnormal activity part during the relative movement between the abnormal activity part and other adjacent parts are obtained, and used as the interaction characteristics; wherein the friction force characteristics include the distribution characteristics of the magnitude of the friction force on the surface of the abnormal activity part; Based on the friction force characteristics of the surface of the abnormal activity part, the friction force mutation area on the surface of the abnormal activity part is determined; based on the friction force change gradient in the friction force mutation area, the wear range and wear degree of the surface of the abnormal activity part are estimated.

5. The method according to claim 1, characterized in that The collecting of liquid dynamic data between the abnormally active part and other adjacent parts, analyzing the liquid dynamic data, obtaining liquid movement characteristics between the abnormally active part and other adjacent parts; estimating loosening trend information of the abnormally active part based on the liquid movement characteristics, specifically: Collecting liquid pressure data and liquid flow rate data between the abnormally active part and other adjacent parts; performing time change analysis on the liquid pressure data and the liquid flow rate data to obtain the liquid pressure change characteristics and liquid flow rate change characteristics between the abnormally active part and other adjacent parts during any two adjacent hip joint prosthesis activities; Based on the liquid pressure variation characteristics and the liquid flow velocity variation characteristics, the variation trend of the gap space range between the abnormal activity part and other adjacent parts is determined, so as to estimate the loose displacement size and direction variation trend of the abnormal activity part.

6. A dynamic monitoring system for hip joint prosthesis wear and loosening, characterized in that: The system includes the following modules: An activity data collection and analysis module is used to collect activity data of the hip joint prosthesis in the human body, analyze the activity data, and determine whether an activity drift event occurs in the hip joint prosthesis; An abnormal activity part identification module is used to identify the abnormal activity part based on the activity reset characteristics of all parts in the hip joint prosthesis when the hip joint prosthesis has an activity drift event; A part interaction determination module is used to collect contact action state data between the surface of the abnormal activity part and other adjacent parts, analyze the contact action state data, and obtain the interaction characteristics between the abnormal activity part and other adjacent parts during the relative movement between the two parts; A part wear state determination module, used for determining wear state information of the surface of the abnormal activity part based on the interaction characteristics; A liquid movement characteristic determination module is used to collect liquid dynamic data between the abnormal activity site and other adjacent sites, analyze the liquid dynamic data, and obtain liquid movement characteristics between the abnormal activity site and other adjacent sites; The loosening trend module is used to estimate the loosening trend information of the abnormally active part based on the fluid movement characteristics.

7. The system according to claim 6, characterized in that The activity data collection and analysis module is used to collect activity data of the hip joint prosthesis in the human body, analyze the activity data, and determine whether the hip joint prosthesis has an activity drift event, specifically: Collecting the activity displacement data and activity posture angle data of all parts of the hip joint prosthesis in the human body, analyzing the activity displacement data, and obtaining the displacement change data of the parts in the non-main motion direction during a single continuous activity; based on the displacement change data, determining the displacement drift rate of the parts in the non-main motion direction during a single continuous activity; A time evolution analysis is performed on the displacement drift rate of all parts in the non-main motion direction during multiple continuous activities to determine whether the hip joint prosthesis shows a trend of gradually increasing displacement drift in the non-main motion direction during multiple continuous activities; if so, it is determined that the hip joint prosthesis has an activity drift event; if not, it is determined that the hip joint prosthesis has not experienced an activity drift event.

8. The system according to claim 7, characterized in that The abnormal activity part identification module is used to identify the abnormal activity part based on the activity reset characteristics of all parts in the hip joint prosthesis when the hip joint prosthesis has an activity drift event, specifically: When the hip joint prosthesis has an activity drift event, the activity posture angle data of the part is analyzed to obtain the posture angle difference characteristics of the part corresponding to the activity start time point and the activity end time point during a single reciprocating activity process, which is used as the activity reset feature of the part; Based on the posture angle difference characteristics, determine whether the part is an abnormally active part.

9. The system according to claim 6, characterized in that The part interaction determination module is used to collect contact action state data between the surface of the abnormal activity part and other adjacent parts, analyze the contact action state data, and obtain the interaction characteristics between the abnormal activity part and other adjacent parts during the relative movement, specifically: Collecting data on the contact pressure applied to the surface of the abnormally active part by other adjacent parts; wherein the contact pressure applied to the surface of the abnormally active part by other adjacent parts includes data on the magnitude and direction of the pressure applied to the entire surface of the abnormally active part by other adjacent parts; Based on the contact pressure action state data and the curvature distribution data of the surface of the abnormal activity part, the friction force characteristics of the surface of the abnormal activity part during the relative movement between the abnormal activity part and other adjacent parts are obtained, and used as the interaction characteristics; wherein the friction force characteristics include the distribution characteristics of the magnitude of the friction force on the surface of the abnormal activity part; The part wear state determination module is used to determine the wear state information of the surface of the abnormal activity part based on the interaction characteristics, specifically: Based on the friction force characteristics of the surface of the abnormal activity part, the friction force mutation area on the surface of the abnormal activity part is determined; based on the friction force change gradient in the friction force mutation area, the wear range and wear degree of the surface of the abnormal activity part are estimated.

10. The system according to claim 6, characterized in that The liquid movement characteristic determination module is used to collect liquid dynamic data between the abnormal activity site and other adjacent sites, analyze the liquid dynamic data, and obtain the liquid movement characteristics between the abnormal activity site and other adjacent sites, specifically: Collecting liquid pressure data and liquid flow rate data between the abnormally active part and other adjacent parts; performing time change analysis on the liquid pressure data and the liquid flow rate data to obtain the liquid pressure change characteristics and liquid flow rate change characteristics between the abnormally active part and other adjacent parts during any two adjacent hip joint prosthesis activities; The loosening trend module is used to estimate the loosening trend information of the abnormally active part based on the liquid movement characteristics, specifically: Based on the liquid pressure variation characteristics and the liquid flow velocity variation characteristics, the variation trend of the gap space range between the abnormal activity part and other adjacent parts is determined, so as to estimate the loose displacement size and direction variation trend of the abnormal activity part.

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