A detection system for features of gait in knee cartilage degeneration

Abstract

A kind of detection system and method of knee cartilage degeneration gait graph feature, at least including rack, the surface of the rack is provided with belt conveyor, the upper surface of the rack is fixedly connected with support frame;Work position conversion mechanism, for triggering the switching of measured object from first work position to second work position;Detection acquisition subsystem: it further includes several markers and high-speed camera in image acquisition device, the image acquisition device is used to respectively collect tester in first work position, joint three-dimensional six degrees of freedom motion data in second work position, the three-dimensional six degrees of freedom motion data include flexion, eversion, internal rotation, forward displacement, internal displacement and upward displacement of joint in space;Controller: for extracting the tibia-femur kinematics data of test leg, at least including medial compartment KOA knee varus angle, lateral compartment KOA knee valgus angle in the knee cartilage degeneration gait graph feature point information, and is uniformly regressed as several data points, forms current motion situation curve information.

Description

Technical Field

[0001] This invention relates to the field of knee cartilage degeneration detection technology, specifically to a detection system and method for gait characteristics of knee cartilage degeneration. Background Technology

[0002] The most common site of degenerative changes in the knee joint is actually the cartilage of the knee joint. After this cartilage wears down, corresponding symptoms may occur, such as pain when going up and down stairs, difficulty squatting and standing up, and even pain when walking on flat ground.

[0003] The detection methods for knee cartilage degeneration are quantitative MRI and gait analysis. Quantitative MRI uses the same scanner technology in a different way, and each pixel in the image contains the measurement value of the relevant physical quantity of the tissue under study. Gait analysis is a special branch of biomechanics, which conducts kinematic observation and dynamic analysis of limb and joint activities during human walking, and provides a series of time, geometry, mechanical and other parameter values ​​and curves. Its clinical significance lies in the fact that quantitative MRI is too cumbersome and expensive.

[0004] The applicant, Univ Stanford University, disclosed in Canadian patent CA2354525 a method for assessing the condition of a joint and preventing damage, which describes how to detect knee cartilage degeneration. This involves obtaining three 3D MRI images of the cartilage, correlating the cartilage map with the joint's motion trajectory to assess the knee joint's motion trajectory after cartilage wear. Reference markers are used to describe the cartilage map, simulating the knee joint's motion. These markers are used to mark various relevant images, and the degree of knee cartilage degeneration is assessed based on changes in cartilage thickness. However, this patent proposal presents numerous assessment calculations, making the entire assessment very complex. It is not suitable for real-time monitoring of the examinee's condition, and the complex testing institutions and assessment algorithms hinder its widespread adoption in the industry. Summary of the Invention

[0005] The purpose of this invention is to provide a detection system and method for gait characteristics of knee cartilage degeneration, so as to solve the problem that quantitative MRI technology is too cumbersome and expensive as mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a detection system for gait characteristics of knee cartilage degeneration, comprising:

[0007] The machine body includes a frame, the surface of which is provided with a conveyor belt, and a support frame is fixedly connected to the upper surface of the frame;

[0008] The display mechanism includes a support plate connected to the surface of a support frame. A display screen is movably connected to the surface of the support plate. A wire is fixedly connected to the surface of the support plate. A rotary valve is fixedly connected to the surface of the display screen. A rotating ball is fixedly connected to the inner side of the support plate. The rotating ball and the rotary valve are plugged into each other. A connecting frame is fixedly connected to the outer surface of the support plate. An adjusting rod is threaded through the surface of the connecting frame. A stop plate is fixedly connected to the surface of the adjusting rod.

[0009] Preferably, the display screen is movably connected to the support plate via a rotary valve and a rotary ball, and the two ends of the wire are connected to the surfaces of the support plate and the frame.

[0010] Preferably, the surface of the rotary valve has a circular groove, and the size of the circular groove is larger than the size of the rotating ball. The connecting frame is in an "L" shape and acts on the surface of the support plate.

[0011] Preferably, the connecting frame is connected in three groups on the surface of the support plate, the adjusting rod is connected to the connecting frame accordingly, and the abutment plate is abutted and connected to the display screen through the adjusting rod.

[0012] Preferably, the surface of the support plate is provided with a connecting mechanism, the connecting mechanism includes a fixing block, the fixing block is fixedly connected to the surface of the support plate, the surface of the fixing block is provided with a groove, and a retaining ring is movably connected to the inner side of the groove. The outer surfaces of the support plate and the frame are provided with an adjustment component, and a ring plate is fixedly connected to the surface of the adjustment component.

[0013] Preferably, the ring plate consists of two parts. One part of the ring plate is in the shape of a round rod, and the surface of the round rod ring plate is distributed with threads. The round rod ring plates are connected in two sets, and the threads distributed on the surface are in opposite directions. The other part of the ring plate is in the shape of a screw cylinder.

[0014] A method for detecting gait characteristics of knee cartilage degeneration:

[0015] S1: The patient to be tested stands on the rotating belt. The rotating belt is then started, and the patient begins to walk. The state of knee cartilage degeneration is analyzed based on the status displayed on the screen. When the viewing angle of the screen needs to be adjusted, the operator rotates the adjustment rod, causing the abutment to press against the screen. Under the rotation connection of the rotary valve and the rotary ball, the angle of action of the screen within the support plate is changed, improving the viewing effect of the screen.

[0016] S2: When installing and using the support plate, rotate the nut on the retaining ring to change the angle between the retaining rings. Then connect the retaining ring to the support frame, and rotate the nut on the retaining ring to support the fixing block, thus completing the connection of the support plate on the support frame. Under the action of the adjustment component and the ring plate, the ring plate provides angular support for the wire, improving the performance and lifespan of the wire.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention acquires data from multiple motion positions, such as three-dimensional six-degree-of-freedom motion data including but not limited to joint flexion and extension, varus / valgus, internal / external rotation, anterior-posterior displacement, lateral displacement, and superior-inferior displacement in space, or is divided into 3 degrees of freedom (DOF): horizontal plane rotation (internal / external rotation), sagittal plane rotation (flexion / extension), and coronal plane rotation (varus / valgus), and uniformly regresses them into several data points. After regressing the gait characteristics involving knee cartilage degeneration, a dynamic graph is formed, which can obtain a good detection method and evaluation experience.

[0019] This invention takes into account the possibility of deliberate movement by the tested object. Therefore, it specifically designs a first working position and a second working position for the tested object within the system. The first and second working positions correspond to the first and second motion states of the tested object acquired by this invention, respectively. Sagittal motion models and coronal motion models are also set for the first and second motion states, respectively. The data obtained from the sagittal and coronal motion model calculation units form the current continuous dynamic value of the tested object. This value is then compared with pre-set gait parameters for knee cartilage degeneration to obtain the corresponding evaluation result. Experimental data shows that this method has higher accuracy.

[0020] Furthermore, by connecting the support plate and the display screen, and then connecting the display screen and the rotary valve, and finally connecting the support plate and the rotating ball, the angle of the display screen within the support plate can be adjusted. By connecting the connecting frame and the support plate, and then connecting the adjusting rod and the abutment plate, the angle of the display screen on the support plate can be controlled, thus achieving a better viewing effect. The core of this viewing effect lies in the accuracy of obtaining the second motion state data of the object being measured, and minimizing the need for deliberate movement of the object being measured.

[0021] By connecting the fixing block and the retaining ring, and connecting the retaining ring and the support frame, the position of the support plate on the support frame is supported. With the connection of the adjusting component and the ring plate, the engagement between the ring plate and the wire achieves the effect of supporting the connection angle of the wire on the frame and the support plate, avoiding the wire from bending at the connection point for a long time, which would affect the performance and life of the wire. Attached Figure Description

[0022] Figure 1 This is a frontal perspective view of the structure of the present invention;

[0023] Figure 2A This is a diagram illustrating one way a digital probe can be used. Figure 2B An example diagram illustrating the acquisition of marker information to establish an adaptive three-dimensional coordinate system for the tibia and femur of the test subject when standing;

[0024] Figure 3 This is a rear-view perspective view of the structure of the present invention;

[0025] Figure 4 This is a partial exploded perspective view of the connection structure between the support plate and the display screen of the present invention;

[0026] Figure 5 For the present invention Figure 4 A three-dimensional structural diagram of the connecting frame;

[0027] Figure 6 For the present invention Figure 3 A magnified structural diagram of point A in the middle.

[0028] In the diagram: 1. Frame; 11. Belt; 12. Support frame; 2. Support plate; 21. Display screen; 22. Wire; 23. Rotary valve; 24. Rotary ball; 25. Connecting frame; 26. Adjusting rod; 27. Support plate; 3. Fixing block; 31. Snap ring; 32. Adjusting assembly; 33. Ring plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Knee osteoarthritis (KOA) is a chronic arthritis characterized by cartilage deformation and loss, and bone regeneration at the joint margins and subchondral bone. It is the most common chronic degenerative joint disease among middle-aged and elderly people; the prevalence rate in people over 40 years of age is 23.5% in men and 32.8% in women, with a higher incidence in women and an increasing overall prevalence year by year. KOA can cause knee pain, limited joint movement, and partial loss of function. With the aging population and patients' increasing demands for quality of life, early detection and treatment of this disease are becoming increasingly important. The Recht grading system has five grades: Grade I – Intact articular cartilage, but reduced thickness, smooth surface; Grade II – Disappearance of cartilage layering, with localized low signal intensity, but the cartilage surface remains smooth; Grade III – Mild to moderate irregularity of the cartilage surface, with defects in the articular cartilage, but less than half the normal thickness; Grade IV – Severe defects in the cartilage surface, with defects exceeding half the normal thickness, but not completely detached; Grade V – Complete detachment of the cartilage, severe defects, exposure of subchondral bone, and possible changes in subchondral bone signal intensity. The Recht grading system emphasizes cartilage defects and neglects other pathological tissues in KOA, such as osteophytes, subchondral cysts, and subchondral bone marrow edema. Some studies have proposed a new MRI grading system for KOA based on the endoscopic Noyes grading system—the Park grading system—which has good inter-observer reliability (0.914–0.938) and intra-group reliability (0.829–0.840). This grading system classifies KOA on MRI into five grades: Grade 0 – No cartilage damage or very few osteophytes (<5mm); Grade I – Noyes Grade I cartilage damage with at least one of the following (osteophytes >5mm, BME >10mm, subchondral cyst >10mm); Grade II – Noyes Grade II with at least one of the following (osteophytes >5mm, BME >10mm, subchondral cyst >10mm); Grade III – Noyes Grade III cartilage damage with at least one of the following (osteophytes >5mm, BME >10mm, subchondral cyst >10mm); Grade IV – Noyes Grade III cartilage damage with a third-degree meniscus tear. The Park grading system classifies KOA based on the characteristics of the lesion tissue and can effectively and accurately diagnose KOA. However, the Park grading system is a recently proposed system, and its feasibility and effectiveness need to be tested over time.

[0031] This invention can obtain relevant kinematic parameters through a three-dimensional motion capture system, including the variation patterns of stride length, gait speed, cadence, stride width, stride length, foot deviation angle, and gait cycle. Currently, many scholars have used this system to study the kinematic characteristics of patients with different degrees of KOA. Studies have found that the basic characteristic of the gait of KOA patients is an "escape gait," namely, a decrease in gait speed, stride length, single-arm support phase of the affected limb, and cadence.

[0032] Bilateral KOA patients exhibit a tendency for the trunk to tilt to one side during walking, increasing stress on the medial knee joint and exacerbating wear and tear. Onley, Mattsson, and others have observed a progressive slowing of gait in KOA patients. Recent studies have investigated the differences in gait characteristics between medial and lateral compartment KOA, finding increased varus angle in medial compartment KOA and increased valgus angle in lateral compartment KOA. However, both types of KOA patients exhibit patellar tilt and disorder.

[0033] Therefore, the present invention provides a detection system for gait graph features of knee cartilage degeneration, comprising:

[0034] The machine body includes a frame, the surface of which is provided with a conveyor belt, and a support frame is fixedly connected to the upper surface of the frame;

[0035] The working position switching mechanism is used to switch between the first working position for the motion capture system to collect three-dimensional motion data of the joints of the test object under the first motion state and the second working position for the motion capture system to collect three-dimensional motion data of the joints of the test object under the second motion state.

[0036] The detection and acquisition subsystem further includes an image acquisition device including several markers and a high-speed camera. The image acquisition device is used to acquire three-dimensional six-degree-of-freedom motion data of the joints of the test subject in the first working position and the second working position, respectively. The three-dimensional six-degree-of-freedom motion data includes, but is not limited to, the joints’ flexion and extension, inversion and eversion, internal and external rotation, anterior and posterior displacement, internal and external displacement and vertical displacement in space.

[0037] Controller: Used to extract tibia-femoral kinematic data of the test leg, including at least the knee cartilage degeneration gait feature point information such as the medial compartment KOA varus angle and the lateral compartment KOA valgus angle, and uniformly regress them into several data points to form the current motion state curve.

[0038] For example, a system typically includes a stereo infrared tracking device (Polaris Spectra; Northern Digital Inc., Waterloo, ON, Canada), at least two sets of markers, a digital probe, a high-speed optical camera, a two-way treadmill, and a controller (or computer). The testing procedure is as follows: (1) Guide the subject to adapt to walking on the treadmill for several minutes. (2) Secure at least two sets of markers to the middle of the subject's thighs and calves with bandages. Figure 2A ), Figure 2A The digital probes in the middle are used to identify bone landmarks. (3) In the initial state, the marking information is collected to establish an adaptive three-dimensional coordinate system of the tibia and femur of the test subject when standing. Figure 2B(4) Receive each subject walking on the treadmill for 15 seconds (about 15 gait cycles (GC), which allows the subject to choose the speed), and enable the system's high-speed optical camera to continuously collect kinematic data, for example, using a high-speed camera to record and identify gait cycles at the same time.

[0039] A motion database of three-dimensional, six-DOF knee joint motion in normal individuals is established. This database includes at least data on flat gait, uphill gait, and squatting / standing movements. Three-dimensional, six-DOF knee joint motion data of the test subject are collected during flat gait, uphill gait, and squatting / standing movements. A work position switching mechanism is implemented to address the issue that people are often tense or consciously trying to move on the walking mechanism, making it difficult to obtain accurate data. For example, by intentionally adjusting the display screen, the subject can unconsciously switch from a first motion state to a second motion state, resulting in more accurate data. The first and second motion states can include horizontal walking, incline walking, or walking while performing a dual task. Furthermore, the display screen can provide motion guidance, such as indicating when the test subject can switch from horizontal walking to incline walking, or providing corresponding guidance for alternating between horizontal and incline walking.

[0040] Furthermore, the first and second movement states each include a sagittal movement model and a coronal movement model, respectively. For example, in the first movement state, data from at least 15 gait cycles (GC) are collected. Each gait data set includes sagittal rotation (flexion / extension) data, as well as the flexion angle data and tibial translation data for the current gait. Figure 2B For example, by finding the sagittal reference point and the knee reference point for the current gait, the corresponding current flexion angle data and tibial posterior translation data can be calculated. Similarly, by finding the three-dimensional data values ​​of the tibial reference point in the previous gait and the three-dimensional data values ​​of the tibial reference point in the current gait, the tibial posterior translation data can be calculated. The sagittal rotation (flexion / extension) data of several gait cycles (e.g., 15), the flexion angle data of the current gait, and the tibial translation data are connected and saved as the current continuous values ​​of the sagittal motion model in the first motion state. Similarly, in the coronal motion model, the data from at least 15 gait cycles (GC) are collected, and the lateral tibial translation data and abduction angle data for each gait cycle are obtained and saved as the current continuous values ​​of the coronal motion model in the first motion state.

[0041] When the acquisition device acquires data from the transition from the first motion state to the second motion state, it also acquires data for at least 15 gait cycles (GC). Similarly, it obtains the current continuous values ​​of the sagittal motion model and the coronal motion model in the second motion state.

[0042] This invention can display the current continuous values ​​of the sagittal motion model in the first motion state / second motion state, and the current continuous values ​​of the coronal motion model in the first motion state / second motion state, respectively. Alternatively, after data denoising, the two sets of data can be averaged to display one set of current continuous values ​​for the sagittal motion model and the other set for the coronal motion model. Generally, viewing the data from the sagittal motion model clearly reveals the cartilage damage in the superior region. Viewing the data from the coronal model clearly reveals the distribution of cartilage damage in the lateral compartment near the tibia.

[0043] When continuous gait cycle information is collected, gait map features of knee cartilage degeneration can be generated, and after regression analysis, a dynamic map can be formed.

[0044] Furthermore, when certain data (such as flexion angle data and tibial translation data of the current gait, or lateral tibial translation data and abduction angle data) exceed certain thresholds pre-stored in the controller, abnormal detection information can be output.

[0045] From the perspective of the controller, the controller of the present invention further includes:

[0046] Model setting unit: The first motion state and the second motion state are respectively set as sagittal motion model and coronal motion model;

[0047] The sagittal motion model calculation unit is used to collect data from at least a number of gait cycles (GC) in the first motion state / second motion state, and obtain the corresponding sagittal rotation data, flexion angle data and tibial translation data for each gait data to form the connected sagittal motion values ​​of the sagittal motion model for the current number of gait cycles.

[0048] The coronal motion model calculation unit is used to collect data from at least a number of gait cycles (GC) in the first motion state / second motion state, and obtain the corresponding lateral tibial translation data and abduction angle data for each gait data to form the connected coronal motion values ​​of the coronal motion model for the current number of gait cycles.

[0049] The knee cartilage degeneration gait assessment unit is used to generate current continuous dynamic values ​​from the data obtained by the sagittal motion model calculation unit and the coronal motion model calculation unit. These values ​​are then compared with the pre-set knee cartilage degeneration gait parameters to obtain the corresponding assessment results.

[0050] Application examples

[0051] The detection and acquisition subsystem can utilize the existing Opt i_knee joint acquisition system to collect gait data on the athlete's knee movements on flat ground and basic athlete information. The portable motion analysis system can be specifically designed for tibia-femoral kinematic analysis. This is a miniaturized motion capture system; its portable host workstation contains an integrated binocular infrared camera (sampling frequency 60Hz) and a high-speed camera. The optical tracking system has an accuracy of 0.3mm RMS (Northern Digital Inc., Ontario, Canada), and also includes several reflective marker balls that can be worn directly at designated positions on the person. Subsequently, tibial-femoral kinematic data of the test leg is extracted, such as three-dimensional six-degree-of-freedom motion data including but not limited to joint flexion and extension, varus / valgus, internal and external rotation, anterior and posterior displacement, internal and external displacement, and superior and inferior displacement in space, or divided into 3 degrees of freedom (DOF): horizontal plane rotation (internal / external rotation), sagittal plane rotation (flexion / extension), and coronal plane rotation (varus / valgus), and uniformly regressed into several data points. After regressing the gait characteristics involving knee cartilage degeneration, a dynamic map is formed.

[0052] The workstation switching mechanism further includes:

[0053] The display mechanism includes a support plate connected to the surface of a support frame, a display screen movably connected to the surface of the support plate, wires fixedly connected to the surface of the support plate, a rotary valve fixedly connected to the surface of the display screen, a rotating ball fixedly connected to the inner side of the support plate, the rotating ball and the rotary valve being plugged into each other, a connecting frame fixedly connected to the outer surface of the support plate, an adjusting rod threadedly connected to the surface of the connecting frame, and a stop plate fixedly connected to the surface of the adjusting rod.

[0054] Controller: Used to further control the rotational connection between the adjusting rod and the connecting frame, thereby changing the position of the abutment on the display screen and achieving control and adjustment of the display screen's angle of action.

[0055] The following is only one example of a workstation switching mechanism.

[0056] Please see Figure 1-6 One embodiment provided by the present invention:

[0057] A system for detecting gait characteristics of knee cartilage degeneration, comprising:

[0058] The machine body includes a frame 1, a conveyor belt 11 is provided on the surface of the frame 1, and a support frame 12 is fixedly connected to the upper surface of the frame 1. With the connection between the frame 1 and the conveyor belt 11, the rotation of the conveyor belt 11 is controlled by the motor inside the frame 1. With the connection between the support frame 12 and the frame 1, the support effect for the patient on the conveyor belt 11 is achieved.

[0059] The display mechanism includes a support plate 2 connected to the surface of a support frame 12. A display screen 21 is movably connected to the surface of the support plate 2. A wire 22 is fixedly connected to the surface of the support plate 2. A rotary valve 23 is fixedly connected to the surface of the display screen 21. A rotating ball 24 is fixedly connected to the inner side of the support plate 2. The rotating ball 24 and the rotary valve 23 are connected by insertion. A connecting frame 25 is fixedly connected to the outer surface of the support plate 2. An adjusting rod 26 is threaded through the surface of the connecting frame 25. A stop plate 27 is fixedly connected to the surface of the adjusting rod 26. Through the connection between the support plate 2 and the display screen 21, the connection between the display screen 21 and the rotary valve 23, and the connection between the support plate 2 and the rotating ball 24, the angle of the display screen 21 on the support plate 2 can be adjusted. Through the connection between the connecting frame 25 and the adjusting rod 26, and the abutment connection between the stop plate 27 and the display screen 21, the angle of the display screen 21 on the support plate 2 can be adjusted.

[0060] Furthermore, the display screen 21 is movably connected to the support plate 2 via the rotary valve 23 and the rotating ball 24. The two ends of the wire 22 are connected to the surface of the support plate 2 and the frame 1. Through the connection between the display screen 21 and the rotary valve 23, the angle of the display screen 21 on the support plate 2 can be adjusted by the rotation of the rotary valve 23 and the rotating ball 24.

[0061] Furthermore, the surface of the rotary valve 23 is provided with a circular groove, and the size of the circular groove is larger than the size of the rotating ball 24. The connecting bracket 25 is in an "L" shape and acts on the surface of the support plate 2. Through the rotational connection of the rotary valve 23 and the rotating ball 24, the viewing angle of the display screen 21 can be adjusted.

[0062] Furthermore, the connecting frame 25 is connected in three groups on the surface of the support plate 2. The adjusting rod 26 is connected to the connecting frame 25. The abutment 27 is connected to the display screen 21 through the adjusting rod 26. Through the connection between the connecting frame 25 and the support plate 2, the position of the abutment 27 on the display screen 21 is changed under the rotational connection of the adjusting rod 26 and the connecting frame 25, so as to achieve the effect of controlling and adjusting the angle of the display screen 21.

[0063] Furthermore, the surface of the support plate 2 is provided with a connecting mechanism, which includes a fixing block 3. The fixing block 3 is fixedly connected to the surface of the support plate 2. The surface of the fixing block 3 is provided with a groove, and a retaining ring 31 is movably connected to the inner side of the groove. The outer surfaces of the support plate 2 and the frame 1 are provided with an adjusting component 32. The surface of the adjusting component 32 is fixedly connected with a ring plate 33. Through the connection of the fixing block 3 and the retaining ring 31, and under the connection of the fixing block 3 and the support plate 2, the retaining ring 31 and the support frame 12 are connected, thereby achieving the fixed support effect of the support plate 2 on the support frame 12.

[0064] Furthermore, the ring plate 33 consists of two parts. One part of the ring plate 33 is in the shape of a round rod, and the surface of the round rod ring plate 33 is distributed with threads. The round rod ring plate 33 is connected in two sets, and the threads distributed on the surface are in opposite directions. The other part of the ring plate 33 is in the shape of a screw cylinder. Through the connection between the ring plate 33 and the adjusting component 32, the connection angle of the wire 22 is supported by the abutting connection between the ring plate 33 and the wire 22.

[0065] A method for detecting gait characteristics of knee cartilage degeneration: It can obtain the current continuous values ​​of the sagittal motion model in the first / second motion state and the current continuous values ​​of the coronal motion model in the first / second motion state, respectively. Alternatively, after data denoising, the two sets of data can be averaged, and then one set of current continuous values ​​for the sagittal motion model and the other for the coronal motion model can be displayed. Generally, viewing the data from the sagittal motion model clearly reveals the cartilage damage in the superior region. Viewing the data from the coronal model clearly reveals the distribution of cartilage damage in the lateral compartment near the tibia.

[0066] When continuous gait cycle information is collected, gait characteristics of knee cartilage degeneration can be generated. After regression analysis, a dynamic image can be formed, which doctors can use to perform corresponding tests and medical judgments.

[0067] S1: The patient to be tested stands on the rotating belt 11. Then the rotating belt 11 is started so that the patient can start walking. During walking, the collected data can be displayed in real time on the display screen 21. The state of knee cartilage degeneration can be analyzed based on the state displayed on the display screen 21. When it is necessary to adjust the viewing angle of the display screen 21, the operator rotates the adjustment rod 26 so that the abutment plate 27 presses against the display screen 21. Under the rotation connection of the rotating valve 23 and the rotating ball 24, the angle of action of the display screen 21 in the support plate 2 is changed, thereby improving the viewing effect of the display screen 21.

[0068] S2: When installing and using the support plate 2, rotate the nut on the retaining ring 31 to change the angle between the retaining rings 31. Then connect the retaining ring 31 to the support frame 12, and then rotate the nut on the retaining ring 31 to support the fixing block 3, thus completing the connection of the support plate 2 on the support frame 12. Under the action of the adjusting component 32 and the ring plate 33, the ring plate 33 provides angular support for the wire 22, improving the performance and lifespan of the wire 22.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A system for detecting gait characteristics of knee cartilage degeneration, characterized in that, include: The machine body includes a frame, the surface of which is provided with a conveyor belt, and a support frame is fixedly connected to the upper surface of the frame; The workstation switching mechanism is used to trigger the switching of the tested object from the first workstation to the second workstation; The detection and acquisition subsystem further includes an image acquisition device including several markers and a high-speed camera. The image acquisition device is used to acquire three-dimensional six-degree-of-freedom motion data of the joints of the test subject in the first working position and the second working position, respectively. The three-dimensional six-degree-of-freedom motion data includes the joints’ flexion and extension, inversion and eversion, internal and external rotation, anterior and posterior displacement, internal and external displacement and vertical displacement in space. Controller: Used to extract tibia-femoral kinematic data of the test leg, including at least the knee cartilage degeneration gait feature point information such as the medial compartment KOA varus angle and the lateral compartment KOA valgus angle, and uniformly regress it into several data points to form the current motion state curve information; The workstation switching mechanism further includes: The display mechanism includes a support plate connected to the surface of a support frame, a display screen movably connected to the surface of the support plate, wires fixedly connected to the surface of the support plate, a rotary valve fixedly connected to the surface of the display screen, a rotating ball fixedly connected to the inner side of the support plate, the rotating ball and the rotary valve being plugged into each other, a connecting frame fixedly connected to the outer surface of the support plate, an adjusting rod threadedly connected to the surface of the connecting frame, and a stop plate fixedly connected to the surface of the adjusting rod. Controller: Used to further control the rotational connection between the adjusting rod and the connecting frame, thereby changing the position of the abutment on the display screen and controlling and adjusting the angle of the display screen. The controller further includes: Model setting unit: The first motion state and the second motion state are respectively set as sagittal motion model and coronal motion model; The sagittal motion model calculation unit is used to collect data from at least a number of gait cycles in the first motion state / second motion state, and to obtain the corresponding sagittal rotation data, flexion angle data and tibial translation data for each gait data to form the connected sagittal motion values ​​of the sagittal motion model for the current number of gait cycles. The coronal motion model calculation unit is used to collect data from at least a number of gait cycles in the first motion state / second motion state, and obtain the corresponding lateral tibial translation data and abduction angle data for each gait data to form the connected coronal motion values ​​of the coronal motion model for the current number of gait cycles. The knee cartilage degeneration gait assessment unit is used to generate current continuous dynamic values ​​from the data obtained by the sagittal motion model calculation unit and the coronal motion model calculation unit, and compare them with the pre-set knee cartilage degeneration gait parameters to obtain the corresponding assessment results. The surface of the support plate is provided with a connecting mechanism, which includes a fixing block. The fixing block is fixedly connected to the surface of the support plate. The surface of the fixing block has a groove, and a retaining ring is movably connected to the inner side of the groove. The outer surfaces of the support plate and the frame are provided with an adjustment assembly. The surface of the adjustment assembly is fixedly connected with a ring plate. The ring plate consists of two parts. One part of the ring plate is in the shape of a round rod, and the surface of the round rod-shaped ring plate is distributed with threads. The round rod-shaped ring plate is connected in two sets, and the threads distributed on the surface are in opposite directions. The other part of the ring plate is in the shape of a screw cylinder.

2. The detection system for gait characteristics of knee cartilage degeneration according to claim 1, characterized in that: The display screen is movably connected to the support plate via a rotary valve and a rotary ball, and the two ends of the wire are connected to the surfaces of the support plate and the frame.

3. The detection system for gait characteristics of knee cartilage degeneration according to claim 1, characterized in that: The surface of the rotary valve has a circular groove, the size of which is larger than the size of the rotating ball, and the connecting frame is L-shaped and acts on the surface of the support plate.

4. The detection system for gait characteristics of knee cartilage degeneration according to claim 1, characterized in that: The controller also includes: acquiring tibia-femur kinematic data of the extracted test leg, divided into at least 3 degrees of freedom: horizontal plane rotation, sagittal plane rotation, and coronal plane rotation, and uniformly regressing it into several data points; Pearson correlation coefficient r was used for similarity analysis. The significance level of the correlation coefficient was obtained by calculating the p-value. The root mean square deviation (RMSD) was used to compare the deviation of the motion trajectory. These data points are used to obtain the varus angle parameters of the medial compartment KOA and the valgus angle parameters of the lateral compartment KOA, and to obtain the corresponding dynamic trajectory information.

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