Method for determining special femoral prosthesis information based on mirror image reconstruction

Abstract

The invention relates to the technical field of clinical medicine and computers, in particular to a method for determining special femoral prosthesis information based on mirror image reconstruction. The method comprises the following steps: S1, scanning by CT equipment to obtain a hip femur CT image, acquiring scanning process data, processing to obtain a scanning quality evaluation value, and judging whether the CT image is qualified or not to obtain a standard hip femur CT image; s2, performing three-dimensional reconstruction according to the standard hip femur CT image, and collecting target femur feature data; s3, according to the target femur feature data, processing to obtain a bilateral femur form abnormity evaluation value, determining a mirror image reconstruction mode, and obtaining a femur prosthesis model through mirror image reconstruction; s4, collecting basic data of the femoral prosthesis, and processing the basic data to obtain a femoral prosthesis quality evaluation index; s5, whether the prosthesis can be installed or not is judged according to the femoral prosthesis quality evaluation index, and a basis is provided for judging whether the prosthesis can be installed or not by providing the special femoral prosthesis information determining method based on mirror image reconstruction.

Description

Technical Field

[0001] The invention relates to the fields of clinical medicine and computer technology, and in particular to a method for determining special femoral prosthesis information based on mirror image reconstruction. Background Art

[0002] Patients with developmental dysplasia of the hip (DDH) often have inconsistent development of the femurs on both sides, resulting in unequal lengths of the lower limbs, as well as different femoral anteversion and abduction angles, which greatly affect the patients' lives. In order to improve the patients' lives, total hip replacement is often required to reconstruct the patient's hip anatomical morphology. In order to meet the patients' daily needs as much as possible, the length and abduction of the lower limbs must be kept consistent during surgery, which is also the most important factor affecting patient satisfaction. Previous studies have shown that if the difference between the two sides of the patient is within 20 mm, most patients can adapt on their own. If there is a difference in the abduction angle, patients often complain of inconsistent abduction of the two feet.

[0003] For example, the invention patent with publication number: CN114601601A is a method for repairing the shape of mandibular defects across the midline, including the following steps: S1, three-dimensional reconstruction; S2, mirror repair processing, using the principle of symmetry to reduce the scope of the bone defect; S3, repair processing of the defect across the midline: based on the mathematical model of the mandibular surface established by previously using the machine learning method of the support vector machine to learn the shape of the lower edge of the mandibular surface, predict the missing part of the data, and obtain the repaired mandibular model; S4, design personalized mandibular implants; S5, manufacture personalized implants.

[0004] For example, the invention patent with announcement number: CN108433851B is a method for preparing a tumor-type prosthesis in the middle and upper part of the tibia. First, the healthy and affected tibiae are reconstructed through three-dimensional reconstruction technology, and the osteotomy range is determined according to the tumor location. The tibial prosthesis body is obtained by mirroring on the basis of the healthy tibiae. Then, the lateral steel plates and intramedullary nails for fixing the bones on both sides of the body are designed by computer-aided design at both ends of the body. Finally, the STL model is exported for 3D printing and post-processing.

[0005] However, in the process of implementing the technical solution of the invention in the embodiments of the invention, the present invention has found that the above technology has at least the following technical problems: the existing mirror reconstruction method often leads to inaccurate reconstruction information due to limited and low-quality image data, which in turn affects the construction of the prosthesis model. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a method for determining special femoral prosthesis information based on mirror image reconstruction, which can effectively solve the problems involved in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The first aspect of the present invention provides a method for determining special femoral prosthesis information based on mirror reconstruction, including: S1. A CT device scans to obtain a hip femoral CT image, collects scanning process data, obtains a scanning quality evaluation value after processing, determines whether the CT image is qualified according to the scanning quality evaluation value, and obtains a standard hip femoral CT image.

[0009] S2. Perform three-dimensional reconstruction based on the standard hip femur CT image and collect target femur feature data.

[0010] S3. Based on the target femoral feature data, bilateral femoral morphology abnormality assessment values ​​are obtained through processing, and a mirror reconstruction method is determined based on the bilateral femoral morphology abnormality assessment values, and a femoral prosthesis model is obtained through mirror reconstruction.

[0011] S4. A femoral prosthesis is manufactured according to the femoral prosthesis model, and basic data of the femoral prosthesis is collected, and a femoral prosthesis quality assessment index is obtained after processing.

[0012] S5. Determine whether the prosthesis can be installed based on the femoral prosthesis quality assessment index.

[0013] Optionally, the scanning quality evaluation value is obtained through processing, and the specific process is: the scanning process data includes: environmental interference data, scanning resolution and scanning thickness.

[0014] The environmental interference data includes the electromagnetic interference intensity and vibration frequency of each environmental monitoring point.

[0015] The critical electromagnetic interference intensity, rated vibration frequency, allowable deviation vibration frequency, critical scanning resolution and critical scanning thickness were extracted from the femoral prosthesis database.

[0016] According to the scanning process data, a scanning quality evaluation value is obtained through comprehensive processing. The scanning quality evaluation value is used to quantitatively evaluate the scanning quality of the CT device scanning the patient's hip femur, and provides a basis for evaluating the CT image quality.

[0017] Optionally, the judgment of whether the CT image is qualified is to obtain a standard hip femur CT image, and the specific process is: extracting a scanning quality assessment threshold from a femoral prosthesis database, comparing the scanning quality assessment value with the scanning quality assessment threshold, if the scanning quality assessment value is greater than or equal to the scanning quality assessment threshold, then the hip femur CT image is judged as a standard hip femur CT image; if the scanning quality assessment value is less than the scanning quality assessment threshold, then the hip femur CT image is judged as an unqualified hip femur CT image, and a warning feedback is performed to reacquire the hip femur CT image.

[0018] Optionally, the target femoral characteristic data specifically include: bilateral femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter.

[0019] Optionally, the processing obtains the assessment value of bilateral femoral morphological abnormality, and the specific process is: extracting the reference standard femoral neck-shaft angle, the reference standard femoral anteversion angle, the reference standard femoral shaft curvature, the reference standard femoral head diameter, the allowable deviation femoral neck-shaft angle, the allowable deviation femoral anteversion angle, the allowable deviation femoral shaft curvature and the allowable deviation femoral head diameter from the femoral prosthesis database.

[0020] The bilateral femoral morphology abnormality assessment value includes a right femoral morphology abnormality assessment value and a left femoral morphology abnormality assessment value.

[0021] Based on the target femoral feature data, a comprehensive analysis is performed to obtain a bilateral femoral morphology abnormality assessment value, which is used to quantitatively assess the degree of abnormality of the bilateral femoral morphology of the hip, providing a basis for mirror image reconstruction.

[0022] Optionally, the mirror reconstruction method is determined according to the bilateral femoral morphology abnormality assessment values, and the specific process is: extracting the femoral morphology abnormality assessment interval values ​​from the femoral prosthesis database, and comparing the bilateral femoral morphology abnormality assessment values ​​with the femoral morphology abnormality assessment interval values ​​respectively.

[0023] If the femoral morphology abnormality assessment values ​​of both sides are within the femoral morphology abnormality assessment range, reconstruction will be performed based on the abduction angle and offset of the normal hip joint.

[0024] If the femoral morphology abnormality assessment values ​​on both sides are not within the femoral morphology abnormality assessment interval, the standard hip femoral CT image of the contralateral hip joint is used for three-dimensional reconstruction.

[0025] If only one side has a femoral morphology abnormality assessment value within the femoral morphology abnormality assessment interval, the corresponding side with the femoral morphology abnormality assessment value within the femoral morphology abnormality assessment interval is marked as the abnormal side, and the other side is marked as the normal side. When total hip replacement is performed on the abnormal side, three-dimensional reconstruction is performed using the standard hip femoral CT image of the normal side.

[0026] Optionally, the basic data of the femoral prosthesis specifically include: the femoral head diameter, femoral neck-shaft angle and anteversion angle of the prosthesis model, the femoral head diameter, femoral neck-shaft angle, anteversion angle of the prosthesis and the surface roughness of the prosthesis.

[0027] Optionally, the femoral prosthesis quality assessment index is obtained through processing, and the specific process is: extracting the reference standard prosthesis surface roughness and the allowable deviation prosthesis surface roughness from the femoral prosthesis database.

[0028] According to the basic data of the femoral prosthesis, the allowable deviation of the femoral neck-shaft angle, the allowable deviation of the femoral anteversion angle and the allowable deviation of the femoral head diameter, a femoral prosthesis quality assessment index is obtained through comprehensive processing. The femoral prosthesis quality assessment index is used to quantitatively assess the quality of the femoral prosthesis and provide a basis for judging whether the prosthesis can be installed.

[0029] Optionally, judging whether the prosthesis can be installed based on the femoral prosthesis quality assessment index includes: extracting a mapping set between an initial threshold value for femoral prosthesis quality assessment, a scan quality assessment value and a prosthetic femoral quality correction parameter from a femoral prosthesis database, and obtaining a prosthetic femoral quality correction parameter based on matching of the mapping set, and simply adding the initial threshold value for femoral prosthesis quality assessment and the prosthetic femoral quality correction parameter to obtain a femoral prosthesis quality assessment index threshold.

[0030] Optionally, judging whether the prosthesis can be installed based on the femoral prosthesis quality assessment index also includes: comparing the femoral prosthesis quality assessment index with a femoral prosthesis quality assessment index threshold; if the femoral prosthesis quality assessment index is higher than or equal to the femoral prosthesis quality assessment index threshold, judging that the prosthesis can be installed and installing the prosthesis; if the femoral prosthesis quality assessment index is lower than the femoral prosthesis quality assessment index threshold, judging that the prosthesis cannot be installed and analyzing the reasons.

[0031] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0032] (1) The present invention provides a method for determining special femoral prosthesis information based on mirror reconstruction, comprehensively analyzes the matching degree between the femoral head diameter, femoral neck-shaft angle and anteversion angle of the prosthesis and the prosthesis model, and provides a basis for judging whether the prosthesis can be installed. By improving the matching degree between the geometric shape of the prosthesis and the prosthesis model, the stress concentration between the prosthesis and the bone interface can be reduced, and the risk of prosthesis loosening and fracture can be reduced. At the same time, it is also beneficial to reduce the generation of wear particles and improve the fatigue life of the prosthesis.

[0033] (2) The present invention can reduce image artifacts and noise and improve image quality by monitoring and controlling environmental interference, such as electromagnetic interference and vibration, thereby helping to improve the stability and reliability of CT equipment. By optimizing scanning resolution and scanning thickness as well as environmental conditions, the accuracy of diagnosis can be improved. At the same time, appropriate scanning parameters can balance image quality and radiation dose, reducing unnecessary radiation exposure.

[0034] (3) The present invention can more accurately diagnose femoral morphological abnormalities and related pathological conditions by comprehensively analyzing the bilateral femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter. It helps doctors to formulate more accurate treatment plans and can also be used to monitor treatment effects and disease progression. It can also provide a basis for the reconstruction of prosthetic models, thereby helping to achieve personalized medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of 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.

[0036] Figure 1 It is a schematic diagram of the method flow of the present invention;

[0037] Figure 2 A schematic diagram of the use process of the large rotor and small rotor positioners involved in the embodiment of the present invention;

[0038] Figure 3 The figure is a schematic diagram of the use process of the medullary cavity locator involved in the embodiment of the present invention.

[0039] The accompanying drawings are described as follows:

[0040] 1. Greater trochanter and lesser trochanter locators; 2. Positioning needle A on the left; 2. Positioning needle B on the right; 3. Positioning ruler; 4. Measuring ruler C; 5. Rotation angle ruler; 6. Medullary cavity probe; 7. Measuring ruler D. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. 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.

[0042] Reference Figure 1 As shown, the first aspect of the present invention provides a method for determining special femoral prosthesis information based on mirror reconstruction, including: S1. A CT device scans to obtain a hip femoral CT image, collects scanning process data, obtains a scanning quality evaluation value after processing, determines whether the CT image is qualified according to the scanning quality evaluation value, and obtains a standard hip femoral CT image.

[0043] Specifically, the scanning quality evaluation value is obtained through processing, and the specific process is as follows: the scanning process data includes: environmental interference data, scanning resolution and scanning thickness.

[0044] The environmental interference data includes the electromagnetic interference intensity and vibration frequency of each environmental monitoring point.

[0045] It should be explained that the scanning resolution in this embodiment specifically refers to the density resolution, and the density resolution refers to the minimum difference between two materials of different densities that the CT scanning device can distinguish. Scanning thickness refers to the thickness of each cross-section during CT scanning, and thin-layer scanning can provide more detailed image information. The scanning resolution and scanning thickness can be obtained through the operating interface of the CT scanning device. The environmental monitoring points are deployed on the surface of the CT equipment, and an electromagnetic field strength meter or an electromagnetic interference tester can be used to measure the electromagnetic interference intensity of each environmental monitoring point. A vibration sensor or an accelerometer can be used to measure the vibration frequency of each environmental monitoring point.

[0046] It should be explained that the thinner the scan thickness, the higher the resolution of the image, because thin layers can provide more detailed image information. Conversely, the thicker the scan thickness, the lower the resolution and more image details are lost. Electromagnetic interference may affect the electronic components of the CT scanner, causing artifacts or noise in the image, thereby reducing image quality. Vibration may cause the CT scanner to shake during the scan, resulting in blurred images or inaccurate scan positioning.

[0047] It needs to be explained that the electromagnetic interference intensity far higher than the critical value may cause the noise of the scanning signal to increase, thereby reducing the scanning resolution. For example, electromagnetic interference may cause the signal received by the sensor to be distorted, making it impossible to accurately capture subtle structural information. Vibrations far higher than the rated vibration frequency will cause the mechanical part of the scanning device to be displaced, thereby affecting the positioning accuracy during scanning. This will cause the scanned image to appear blurry or ghosting, thereby reducing the scanning resolution. At the same time, the electromagnetic interference intensity far higher than the critical value may affect the signal transmission and reception of the scanning device, thereby affecting the accuracy of the scanning thickness. For example, in a high electromagnetic interference environment, the scanning device may not be able to accurately penetrate thicker materials, resulting in incomplete or distorted scanning results. Vibrations far higher than the rated vibration frequency will affect the stability of the scanning device, thereby affecting the measurement of the scanning thickness. For example, vibrations may cause the probe position of the scanning device to change, making the scanning thickness data inaccurate.

[0048] The critical electromagnetic interference intensity, rated vibration frequency, allowable deviation vibration frequency, critical scanning resolution and critical scanning thickness were extracted from the femoral prosthesis database.

[0049] According to the scanning process data, a scanning quality evaluation value is obtained through comprehensive processing. The scanning quality evaluation value is used to quantitatively evaluate the scanning quality of the CT device scanning the patient's hip femur, and provides a basis for evaluating the CT image quality.

[0050] In a specific embodiment, the numerical expression of the scanning quality evaluation value is:

[0051]

[0052] Wherein, δSM represents the scan quality assessment value, e represents the natural constant, FB represents the scan resolution, HD represents the scan thickness, i represents the number of each environmental monitoring point, i = 1, 2, 3, ..., s, s represents the total number of environmental monitoring points, DG i represents the electromagnetic interference intensity of the i-th environmental monitoring point, ZP i represents the vibration frequency of the ith environmental monitoring point, Indicates the critical electromagnetic interference intensity, ZP 0 represents the rated vibration frequency, ΔZP represents the allowable deviation vibration frequency, represents the critical scanning resolution, represents the critical scanning thickness, θ 1 Indicates the scan quality correction factor corresponding to the preset scan resolution, θ 2 Indicates the scan quality correction factor corresponding to the preset scan thickness, θ 3 Indicates the scanning quality correction factor corresponding to the preset electromagnetic interference intensity, θ 4 Indicates the scanning quality correction factor corresponding to the preset vibration frequency.

[0053] It needs to be explained that when the electromagnetic interference intensity is stronger, the absolute difference between the vibration frequency and the rated vibration frequency is larger, the scanning resolution is smaller, and the scanning thickness is larger, the corresponding scanning quality assessment value is smaller, indicating that the scanning quality of the CT device scanning the patient's hip femur is worse.

[0054] It should be explained that, in this embodiment, θ 1 Indicates the scan quality correction factor corresponding to the preset scan resolution, θ 2 Indicates the scan quality correction factor corresponding to the preset scan thickness, θ 3 Indicates the scanning quality correction factor corresponding to the preset electromagnetic interference intensity, θ 4Represents the scanning quality correction factor corresponding to the preset vibration frequency. The values ​​of these correction factors respectively represent the degree of influence of the device scanning resolution, device scanning thickness, electromagnetic interference intensity and vibration frequency unit value on the scanning quality of the CT device. When used, these correction factors can be directly obtained from the femoral prosthesis database. The values ​​of these correction factors are preset in the femoral prosthesis database. For example, the device scanning resolution, device scanning thickness, electromagnetic interference intensity and vibration frequency form a mapping set with the correction factors preset in the femoral prosthesis database respectively. The real-time device scanning resolution, device scanning thickness, electromagnetic interference intensity and vibration frequency of the environmental monitoring point are input into the mapping set to obtain the corresponding scanning quality correction factor. These mapping relationships can be one-to-one or many-to-one. The value range of all correction factors is between 0 and 1, indicating the degree from no influence to maximum influence.

[0055] It should be explained that this embodiment can reduce image artifacts and noise and improve image quality by monitoring and controlling environmental interference, such as electromagnetic interference and vibration, thereby helping to improve the stability and reliability of CT equipment. It can also improve the accuracy of diagnosis by optimizing scanning resolution and scanning thickness as well as environmental conditions. At the same time, appropriate scanning parameters can balance image quality and radiation dose and reduce unnecessary radiation exposure.

[0056] Among them, whether the CT image is qualified is judged to obtain a standard hip femur CT image. The specific process is: extracting a scanning quality assessment threshold from the femoral prosthesis database, comparing the scanning quality assessment value with the scanning quality assessment threshold, if the scanning quality assessment value is greater than or equal to the scanning quality assessment threshold, then the hip femur CT image is judged as a standard hip femur CT image; if the scanning quality assessment value is less than the scanning quality assessment threshold, then the hip femur CT image is judged as an unqualified hip femur CT image, and a warning feedback is performed to re-acquire the hip femur CT image.

[0057] In a specific embodiment, the process of performing early warning feedback is as follows: the system automatically generates an early warning report, which contains detailed information of unqualified CT images, such as patient information, scanning time, evaluation results, etc., and notifies relevant personnel such as radiologists, technicians, and attending physicians through the hospital's information system or email. The early warning report should include the following: basic patient information and case number, number and scanning time of unqualified CT images, comparison results of scan quality assessment value and assessment threshold, specific reasons for failure (such as insufficient contrast, motion artifacts, low resolution, etc.), and recommended follow-up operations.

[0058] S2. Perform three-dimensional reconstruction based on the standard hip femur CT image and collect target femur feature data.

[0059] Specifically, the target femoral characteristic data include: bilateral femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter.

[0060] It should be explained that the femoral neck-shaft angle in the present embodiment refers to the angle formed between the long axis of the femoral neck and the longitudinal axis of the femoral shaft. The femoral neck-shaft angle of a normal adult is approximately between 125° and 130°. The size of the neck-shaft angle affects the biomechanics of the knee and hip joints. Too large an angle may cause hip valgus, while too small an angle may cause varus. The femoral anteversion angle refers to the angle between the long axis of the femoral neck and the projection line of the femoral intercondylar line (i.e., the line between the two condyles of the distal femur) on the horizontal plane. The normal anteversion angle is approximately between 15° and 20°. The size of the anteversion angle affects the alignment and gait of the lower limbs. Too large an anteversion angle may cause an inward-femoral gait, while too small an anteversion angle may cause an outward-femoral gait. The curvature of the femoral shaft refers to the degree of curvature of the femoral shaft, which may be a forward bend, a backward bend, an inward bend or an outward bend. Under normal circumstances, the femoral shaft should be relatively straight without obvious curvature. Femoral head diameter refers to the diameter of the largest cross-section of the femoral head. The femoral head diameter of an adult is usually between 42 and 52 mm. Femoral head diameter is one of the important parameters for selecting hip replacement prostheses, which affects the fit of the prosthesis and the stability of the hip joint.

[0061] S3. Based on the target femoral feature data, bilateral femoral morphology abnormality assessment values ​​are obtained through processing, and a mirror reconstruction method is determined based on the bilateral femoral morphology abnormality assessment values, and a femoral prosthesis model is obtained through mirror reconstruction.

[0062] Specifically, the evaluation values ​​of bilateral femoral morphological abnormalities are obtained by processing, and the specific process is: extracting the reference standard femoral neck-shaft angle, the reference standard femoral anteversion angle, the reference standard femoral shaft curvature, the reference standard femoral head diameter, the allowable deviation femoral neck-shaft angle, the allowable deviation femoral anteversion angle, the allowable deviation femoral shaft curvature and the allowable deviation femoral head diameter from the femoral prosthesis database.

[0063] The bilateral femoral morphology abnormality assessment value includes a right femoral morphology abnormality assessment value and a left femoral morphology abnormality assessment value.

[0064] Based on the target femoral feature data, a comprehensive analysis is performed to obtain a bilateral femoral morphology abnormality assessment value, which is used to quantitatively assess the degree of abnormality of the bilateral femoral morphology of the hip, providing a basis for mirror image reconstruction.

[0065] In a specific embodiment, the numerical expression of the bilateral femoral morphology abnormality evaluation value is:

[0066]

[0067] In the formula, Indicates the evaluation value of right femoral morphology abnormality. Indicates the left femoral morphology abnormality assessment value, τDY R represents the right femoral neck-shaft angle, τWD R represents the right femoral anteversion angle, τWQ R Indicates the curvature of the right femoral shaft, τZJ R Indicates the diameter of the right femoral head, τDY L represents the left femoral neck-shaft angle, τWD L represents the left femoral anteversion angle, τWQ L Indicates the curvature of the left femoral shaft, τZJ L Indicates the diameter of the left femoral head, τDY 0 Indicates the reference standard femoral neck-shaft angle, τWD 0 represents the reference standard femoral anteversion angle, τWQ 0 Indicates the reference standard femoral shaft curvature, τZJ 0 represents the reference standard femoral head diameter, ΔτDY represents the allowable deviation of the femoral neck-shaft angle, ΔτWD represents the allowable deviation of the femoral anteversion angle, ΔτWQ represents the allowable deviation of the femoral shaft curvature, ΔτZJ represents the allowable deviation of the femoral head diameter, and ρ 1 Represents the influence factor of femoral morphological abnormality corresponding to the preset femoral neck-shaft angle, ρ 2 Indicates the influence factor of femoral morphology abnormality corresponding to the preset femoral anteversion angle, ρ 3 Indicates the influence factor of femoral morphological abnormality corresponding to the preset femoral shaft curvature, ρ 4 Indicates the influencing factor of femoral morphological abnormality corresponding to the preset femoral head diameter.

[0068] It should be explained that when the absolute difference between the bilateral femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter and the reference standard femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter is greater, the corresponding bilateral femoral morphology abnormality assessment value is greater, indicating that the degree of abnormality of the bilateral femoral morphology of the hip is greater.

[0069] It should be explained that, in this embodiment, 1 Represents the influence factor of femoral morphological abnormality corresponding to the preset femoral neck-shaft angle, ρ 2 Indicates the influence factor of femoral morphology abnormality corresponding to the preset femoral anteversion angle, ρ 3 Indicates the influence factor of femoral morphological abnormality corresponding to the preset femoral shaft curvature, ρ 4The influencing factors of femoral morphology abnormality corresponding to the preset femoral head diameter are represented. The values ​​of these influencing factors respectively represent the influence degree of femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter unit values ​​on femoral morphology abnormality. When used, these influencing factors can be directly obtained from the femoral prosthesis database. The values ​​of these influencing factors are preset in the femoral prosthesis database. For example, the femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter form a mapping set with the influencing factors preset in the femoral prosthesis database respectively. The real-time femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter are input into the mapping set to obtain the corresponding femoral morphology abnormality influencing factors. These mapping relationships can be one-to-one or many-to-one. The value range of all influencing factors is between 0 and 1, indicating the degree from no influence to maximum influence.

[0070] It should be explained that the femoral neck-shaft angle and anteversion angle jointly determine the force line and stability of the femur when bearing weight. The proper coordination of the neck-shaft angle and anteversion angle helps maintain normal joint function and reduce joint wear. There are large individual differences in the curvature of the femoral shaft and the diameter of the femoral head. These anatomical variations may affect the measurement results of the neck-shaft angle and anteversion angle. If the curvature of the femoral shaft is large, the measured values ​​of the neck-shaft angle and anteversion angle may change, thereby affecting the biomechanical properties of the hip joint. In hip joint diseases or artificial joint replacement surgery, the measurement of these parameters is crucial for the formulation of surgical planning. Abnormal femoral neck-shaft angle or anteversion angle may lead to joint instability or poor postoperative function.

[0071] It should be explained that by comprehensively analyzing the bilateral femoral neck-shaft angle, femoral anteversion, femoral shaft curvature and femoral head diameter, the abnormal femoral morphology and related pathological conditions can be diagnosed more accurately. It helps doctors to formulate more precise treatment plans, including surgical correction plans. It can also be used to monitor the treatment effect and the progression of the disease. It can also provide a basis for the reconstruction of the prosthesis model, thus helping to achieve personalized medicine and customize the treatment plan according to the patient's specific anatomical conditions.

[0072] Among them, the mirror reconstruction method is determined according to the bilateral femoral morphology abnormality assessment values. The specific process is: extracting the femoral morphology abnormality assessment interval values ​​from the femoral prosthesis database, and comparing the bilateral femoral morphology abnormality assessment values ​​with the femoral morphology abnormality assessment interval values ​​respectively.

[0073] If the femoral morphology abnormality assessment values ​​of both sides are within the femoral morphology abnormality assessment range, reconstruction will be performed based on the abduction angle and offset of the normal hip joint.

[0074] If the femoral morphology abnormality assessment values ​​on both sides are not within the femoral morphology abnormality assessment interval, the standard hip femoral CT image of the contralateral hip joint is used for three-dimensional reconstruction.

[0075] If only one side has a femoral morphology abnormality assessment value within the femoral morphology abnormality assessment interval, the corresponding side with the femoral morphology abnormality assessment value within the femoral morphology abnormality assessment interval is marked as the abnormal side, and the other side is marked as the normal side. When total hip replacement is performed on the abnormal side, three-dimensional reconstruction is performed using the standard hip femoral CT image of the normal side.

[0076] It should be explained that if the left femoral morphology abnormality assessment value is within the femoral morphology abnormality assessment interval value and the right femoral morphology abnormality assessment value is not within the femoral morphology abnormality assessment interval value, the CT image of the right hip joint is used as a mirror image for reconstruction.

[0077] If the right femoral morphology abnormality assessment value is within the femoral morphology abnormality assessment interval value and the left femoral morphology abnormality assessment value is not within the femoral morphology abnormality assessment interval value, the CT image of the left hip joint is used as a mirror image for reconstruction.

[0078] It should be added that if the patient has already completed total hip replacement on one side during the first surgery, the postoperative CT images of the replaced side will be used for 3D reconstruction. The position and anatomical relationship of the prosthesis on the replaced side will be used as a mirror image to plan the contralateral surgery.

[0079] It should be added that this can be achieved by utilizing advanced CT equipment, such as the 40-row 3D reconstruction CT machine and the Siemens intelligent 16CT SOMATOM Scope, which are usually equipped with software systems that have a variety of 3D reconstruction algorithms and tools.

[0080] In a specific embodiment, the mirror reconstruction steps are as follows: 1. Randomly select 10 points on the femoral head contour obtained by three-dimensional reconstruction, marked as points N1 to N10, requiring that the 10 points are distributed on the surface of the femoral head, and use a sphere to fit the femoral head contour so that the sum of the vertical distances from the selected 10 points to the surface of the sphere is the shortest. The center of the sphere is defined as the rotation center O.

[0081] 2. Mark the highest point of the greater rotor as point B, the highest point of the smaller rotor as point C, and the midpoint of the BC line as point M.

[0082] 3. Label the anatomical axis of the femur as E.

[0083] 4. Measure the distance from point O to point M and mark it as distance F.

[0084] 5. The vertical distance from measuring point O to the femoral anatomical axis E is marked as distance G.

[0085] S4. A femoral prosthesis is manufactured according to the femoral prosthesis model, and basic data of the femoral prosthesis is collected, and a femoral prosthesis quality assessment index is obtained after processing.

[0086] Specifically, the basic data of the femoral prosthesis include: the femoral head diameter, femoral neck-shaft angle and anteversion angle of the prosthesis model, the femoral head diameter, femoral neck-shaft angle, anteversion angle of the prosthesis and the surface roughness of the prosthesis.

[0087] It should be explained that the surface roughness in this embodiment refers to the microscopic unevenness of the surface of the prosthesis. The roughness within the reference standard range can promote the combination of bone tissue and the prosthesis.

[0088] It is important to explain that surface roughness can be measured directly using non-contact white light interferometry.

[0089] Furthermore, a femoral prosthesis quality evaluation index is obtained through processing, and the specific process is: the reference standard prosthesis surface roughness and the allowable deviation prosthesis surface roughness are extracted from the femoral prosthesis database.

[0090] According to the basic data of the femoral prosthesis, the allowable deviation of the femoral neck-shaft angle, the allowable deviation of the femoral anteversion angle and the allowable deviation of the femoral head diameter, a femoral prosthesis quality assessment index is obtained through comprehensive processing. The femoral prosthesis quality assessment index is used to quantitatively assess the quality of the femoral prosthesis and provide a basis for judging whether the prosthesis can be installed.

[0091] In a specific embodiment, the numerical expression of the femoral prosthesis quality evaluation index is:

[0092]

[0093] Where, δJT represents the femoral prosthesis quality assessment index, τJZJ 0 represents the femoral head diameter of the prosthesis model, τJDY 0 represents the femoral neck-shaft angle of the prosthesis model, τJWD 0 represents the femoral anteversion angle of the prosthesis model, τJZJ represents the femoral head diameter of the prosthesis, τJDY represents the femoral neck-shaft angle of the prosthesis, τJWD represents the femoral anteversion angle of the prosthesis, τJCU represents the surface roughness of the prosthesis, ΔτDY represents the allowable deviation of the femoral neck-shaft angle, ΔτWD represents the allowable deviation of the femoral anteversion angle, ΔτZJ represents the allowable deviation of the femoral head diameter, τJCU 0 represents the reference standard prosthesis surface roughness, ΔτJCU represents the allowable deviation prosthesis surface roughness, μ 1 Indicates the femoral prosthesis quality influencing characteristic factor corresponding to the preset prosthesis femoral neck-shaft angle, μ 2 Indicates the femoral prosthesis quality influencing characteristic factor corresponding to the preset prosthetic femoral anteversion angle, μ 3 Indicates the femoral prosthesis quality influencing characteristic factor corresponding to the preset prosthetic femoral head diameter, μ 4 It represents the characteristic factor affecting the quality of the femoral prosthesis corresponding to the preset prosthesis surface roughness.

[0094] It should be explained that when the absolute difference between the femoral neck-shaft angle, femoral anteversion angle and femoral head diameter of the prosthesis and the femoral neck-shaft angle, femoral anteversion angle and femoral head diameter of the prosthesis model is greater, and the absolute difference between the prosthesis surface roughness and the reference standard prosthesis surface roughness is greater, the corresponding femoral prosthesis quality assessment index is smaller, indicating that the quality of the femoral prosthesis is worse.

[0095] It should be explained that in this embodiment, μ 1 Indicates the femoral prosthesis quality influencing characteristic factor corresponding to the preset prosthesis femoral neck-shaft angle, μ 2 Indicates the femoral prosthesis quality influencing characteristic factor corresponding to the preset prosthetic femoral anteversion angle, μ 3 Indicates the femoral prosthesis quality influencing characteristic factor corresponding to the preset prosthetic femoral head diameter, μ 4 It represents the femoral prosthesis quality influencing characteristic factors corresponding to the preset prosthesis surface roughness. The values ​​of these influencing characteristic factors respectively represent the influence degree of the prosthesis femoral neck-shaft angle, prosthesis femoral anteversion angle, prosthesis femoral head diameter and prosthesis surface roughness unit value on the femoral prosthesis quality. When used, these influencing characteristic factors can be directly obtained from the femoral prosthesis database. The values ​​of these influencing characteristic factors are preset in the femoral prosthesis database. For example, the prosthesis femoral neck-shaft angle, prosthesis femoral anteversion angle, prosthesis femoral head diameter and prosthesis surface roughness form a mapping set with the influencing characteristic factors preset in the femoral prosthesis database respectively. The real-time prosthesis femoral neck-shaft angle, prosthesis femoral anteversion angle, prosthesis femoral head diameter and prosthesis surface roughness are input into the mapping set to obtain the corresponding femoral prosthesis quality influencing characteristic factors. These mapping relationships can be one-to-one or many-to-one. The value range of all influencing characteristic factors is between 0 and 1, indicating the degree from no influence to maximum influence.

[0096] It should be explained that the degree of matching between the femoral head diameter of the prosthesis and the femoral head diameter of the prosthesis model directly affects the success of hip replacement surgery. Appropriate diameter can ensure the adaptability of the prosthesis to the acetabulum, reduce the risk of postoperative dislocation, and improve the stability of the joint. The matching of the neck-shaft angle of the prosthesis with the neck-shaft angle of the prosthesis model helps to maintain the normal force line, reduce the tension on the surrounding soft tissue, and reduce the risk of postoperative complications. The matching of the anteversion angle of the prosthesis with the anteversion angle of the prosthesis model helps to restore normal gait and alignment, and reduce the discomfort and gait abnormality of patients after surgery. The surface roughness of the prosthesis within the standard range can promote the ingrowth of bone tissue and enhance the fixation effect of the prosthesis. The surface roughness of the prosthesis mainly affects the combination of the prosthesis and bone tissue. Although the surface roughness itself does not directly affect the femoral head diameter, neck-shaft angle and anteversion angle, the appropriate surface roughness can improve the long-term stability of the prosthesis, thereby indirectly supporting the effectiveness of other parameters. For example, good bone integration can reduce the micro-motion of the prosthesis, thereby reducing the risk of wear and loosening caused by improper mechanical alignment.

[0097] It should be explained that the femoral head diameter, femoral neck-shaft angle, anteversion angle and surface roughness of the prosthesis can affect the force distribution of the joint. By improving the matching degree between the prosthesis geometry and the prosthesis model, the stress concentration between the prosthesis and the bone interface can be reduced, and the risk of prosthesis loosening and fracture can be reduced. The matching degree between the prosthesis geometry and the prosthesis model can directly affect the initial stability and long-term fixation effect of the prosthesis. Good matching can reduce the micro-motion of the prosthesis during movement, which is conducive to reducing the generation of wear particles and improving the fatigue life of the prosthesis. At the same time, by optimizing the surface roughness of the prosthesis, the wear between the prosthesis and the acetabulum can be reduced, further extending the service life of the prosthesis.

[0098] S5. Determine whether the prosthesis can be installed based on the femoral prosthesis quality assessment index.

[0099] Specifically, the femoral prosthesis quality assessment index is used to determine whether the prosthesis can be installed, including: extracting a mapping set between an initial threshold value for femoral prosthesis quality assessment, a scanning quality assessment value and a prosthetic femoral quality correction parameter from a femoral prosthesis database, and obtaining a prosthetic femoral quality correction parameter according to the mapping set matching. The mapping relationship is a one-to-one relationship, that is, the scanning quality assessment value has and only has a unique corresponding prosthetic femoral quality correction parameter. The initial threshold value for femoral prosthesis quality assessment and the prosthetic femoral quality correction parameter are simply added to obtain a femoral prosthesis quality assessment index threshold.

[0100] Among them, judging whether the prosthesis can be installed according to the femoral prosthesis quality assessment index also includes: comparing the femoral prosthesis quality assessment index with the femoral prosthesis quality assessment index threshold; if the femoral prosthesis quality assessment index is higher than or equal to the femoral prosthesis quality assessment index threshold, judging that the prosthesis can be installed and installing the prosthesis; if the femoral prosthesis quality assessment index is lower than the femoral prosthesis quality assessment index threshold, judging that the prosthesis cannot be installed and analyzing the reasons.

[0101] In a specific embodiment, the steps of analyzing the reason why the prosthesis cannot be installed are: S1. The system notifies relevant personnel to evaluate the patient's anatomical structure, including: checking whether the medullary cavity morphology of the femur is suitable for the implantation of the prosthesis, evaluating whether the anteversion angle and neck-shaft angle of the femoral neck meet the design requirements of the prosthesis, and checking whether there is insufficient bone mass, osteoporosis or other bone lesions.

[0102] S2. The system notifies relevant personnel to check the prosthesis design, including: confirming whether the design and size of the prosthesis are suitable for the patient's anatomical structure, and checking whether the fixation mechanism of the prosthesis (such as bone cement fixation, press-fit fixation or hydroxyapatite coating) is suitable for the patient's condition.

[0103] S3. Relevant personnel take appropriate solutions based on the analysis results.

[0104] In a specific embodiment, the femoral prosthesis database is used to store relevant data in the process of quality assessment of the femoral prosthesis, including the initial threshold of femoral prosthesis quality assessment, the mapping set between the scan quality assessment value and the femoral quality correction parameter of the prosthesis, etc. The data extracted from the femoral prosthesis database in the above embodiment can be collected from the case reports of hospitals and clinics. Or the performance data of the prosthesis and the feedback of the patient can be collected through patient follow-up. The imaging data of the femoral prosthesis can also be obtained by X-ray imaging, and a more detailed three-dimensional image of the prosthesis and the surrounding bone tissue can be provided by computer tomography. Magnetic resonance imaging can also be used to evaluate the soft tissue and the bone marrow around the prosthesis. The design parameters of the prosthesis, including size, material, mechanical properties, etc., can be obtained from the prosthesis manufacturer. Strength and durability data can also be obtained by performing mechanical tests such as tension, compression, and bending on the prosthesis in the laboratory. Or CAD software can be used to simulate the behavior of the prosthesis in the body to obtain its adaptability and mechanical distribution data.

[0105] Reference Figure 2 and Figure 3 As shown, the second aspect of the present invention provides a device for determining special femoral prosthesis information based on mirror image reconstruction, comprising: a greater trochanter, a lesser trochanter locator and a medullary cavity locator;

[0106] The greater rotor and smaller rotor positioners include: positioning needle A, positioning needle B, positioning ruler, measuring ruler C and rotation angle ruler;

[0107] The medullary cavity locator includes: a medullary cavity probe and a measuring ruler D.

[0108] In a specific embodiment, the steps for placing the femoral prosthesis are as follows: 1. Insert positioning pin A into point B, and positioning pin B into point C. Move the positioning ruler so that the corresponding readings of positioning pins A and B are consistent. The positioning ruler is symmetrical with the measuring ruler C. The measuring ruler C can be pulled out of the hole. At this time, the measuring ruler is located at the midpoint of positioning pins A and B. Move the measuring ruler C to make the reading ① equal to the distance F.

[0109] 2. Insert the medullary cavity probe into the femoral medullary cavity. The measuring ruler D is perpendicular to the medullary cavity probe and can be moved up and down. The reading ③ is equal to the distance G.

[0110] 3. Rotate the angle ruler and move the measuring ruler D up and down at the same time, so that the end of the measuring ruler C intersects with the end of the measuring ruler D at a point marked as point H. Point H is the femoral rotation center to be reconstructed.

[0111] 4. Record the angle ruler reading at this time and mark it as reading ②.

[0112] 5. Remove the medullary cavity probe, pull out the measuring ruler C from the hole, drive the femoral prosthesis into the femur, insert the measuring ruler C back, turn the angle ruler so that the reading is reading ②, and the reading of measuring ruler C is reading ①. The end of measuring ruler C is the rotation center of the femur.

[0113] Observe whether the position of the prosthesis is in compliance. If so, the femoral head prosthesis can be installed. If not, further adjustments are required.

[0114] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for determining special femoral prosthesis information based on mirror image reconstruction, characterized in that: include: S1. The CT device scans and obtains a hip femur CT image, collects scanning process data, obtains a scanning quality evaluation value after processing, determines whether the CT image is qualified according to the scanning quality evaluation value, and obtains a standard hip femur CT image; S2. Perform three-dimensional reconstruction based on standard hip femur CT images and collect target femur feature data; S3. According to the target femoral feature data, the bilateral femoral morphology abnormality assessment values ​​are obtained through processing, and the mirror image reconstruction method is determined according to the bilateral femoral morphology abnormality assessment values, and the femoral prosthesis model is obtained through mirror image reconstruction; S4. manufacturing a femoral prosthesis according to the femoral prosthesis model, collecting basic data of the femoral prosthesis, and obtaining a femoral prosthesis quality assessment index after processing; S5. Determine whether the prosthesis can be installed based on the femoral prosthesis quality assessment index.

2. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 1, characterized in that: The scanning quality evaluation value is obtained through processing, and the specific process is as follows: The scanning process data includes: environmental interference data, scanning resolution and scanning thickness; The environmental interference data includes the electromagnetic interference intensity and vibration frequency of each environmental monitoring point; The critical electromagnetic interference intensity, rated vibration frequency, allowable deviation vibration frequency, critical scanning resolution and critical scanning thickness were extracted from the femoral prosthesis database; According to the scanning process data, a scanning quality evaluation value is obtained through comprehensive processing. The scanning quality evaluation value is used to quantitatively evaluate the scanning quality of the CT device scanning the patient's hip femur, and provides a basis for evaluating the CT image quality.

3. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 2, characterized in that: The specific process of judging whether the CT image is qualified and obtaining a standard hip femur CT image is as follows: A scanning quality assessment threshold is extracted from the femoral prosthesis database, and the scanning quality assessment value is compared with the scanning quality assessment threshold. If the scanning quality assessment value is greater than or equal to the scanning quality assessment threshold, the hip femoral CT image is judged as a standard hip femoral CT image. If the scanning quality assessment value is less than the scanning quality assessment threshold, the hip femoral CT image is judged as an unqualified hip femoral CT image, and an early warning feedback is performed to reacquire the hip femoral CT image.

4. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 1, characterized in that: The target femoral characteristic data specifically include: bilateral femoral neck-shaft angle, femoral anteversion angle, femoral shaft curvature and femoral head diameter.

5. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 4, characterized in that: The processing obtains the bilateral femoral morphology abnormality assessment value, and the specific process is: The reference standard femoral neck-shaft angle, the reference standard femoral anteversion angle, the reference standard femoral shaft curvature, the reference standard femoral head diameter, the allowable deviation femoral neck-shaft angle, the allowable deviation femoral anteversion angle, the allowable deviation femoral shaft curvature and the allowable deviation femoral head diameter were extracted from the femoral prosthesis database; The bilateral femoral morphology abnormality assessment value includes a right femoral morphology abnormality assessment value and a left femoral morphology abnormality assessment value; Based on the target femoral feature data, a comprehensive analysis is performed to obtain a bilateral femoral morphology abnormality assessment value, which is used to quantitatively assess the degree of abnormality of the bilateral femoral morphology of the hip, providing a basis for mirror image reconstruction.

6. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 5, characterized in that: The mirror image reconstruction method is determined according to the evaluation value of bilateral femoral morphology abnormality, and the specific process is: Extract the femoral morphology abnormality assessment interval value from the femoral prosthesis database, and compare the bilateral femoral morphology abnormality assessment values ​​with the femoral morphology abnormality assessment interval value respectively; If the femoral morphology abnormality assessment values ​​on both sides are within the femoral morphology abnormality assessment interval, reconstruction will be performed based on the abduction angle and offset of the normal hip joint; If the femoral morphology abnormality assessment values ​​on both sides were not within the femoral morphology abnormality assessment interval, the standard hip femoral CT image of the contralateral hip joint was used for three-dimensional reconstruction; If only one side has a femoral morphology abnormality assessment value within the femoral morphology abnormality assessment interval, the corresponding side with the femoral morphology abnormality assessment value within the femoral morphology abnormality assessment interval is marked as the abnormal side, and the other side is marked as the normal side. When total hip replacement is performed on the abnormal side, three-dimensional reconstruction is performed using the standard hip femoral CT image of the normal side.

7. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 1, characterized in that: The basic data of the femoral prosthesis specifically include: the femoral head diameter, femoral neck-shaft angle and anteversion angle of the prosthesis model, the femoral head diameter, femoral neck-shaft angle, anteversion angle of the prosthesis and the surface roughness of the prosthesis.

8. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 1, characterized in that: The femoral prosthesis quality assessment index is obtained through processing, and the specific process is: The reference standard prosthesis surface roughness and the allowable deviation prosthesis surface roughness are extracted from the femoral prosthesis database; According to the basic data of the femoral prosthesis, the allowable deviation of the femoral neck-shaft angle, the allowable deviation of the femoral anteversion angle and the allowable deviation of the femoral head diameter, a femoral prosthesis quality assessment index is obtained through comprehensive processing. The femoral prosthesis quality assessment index is used to quantitatively assess the quality of the femoral prosthesis and provide a basis for judging whether the prosthesis can be installed.

9. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 1, characterized in that: The method of judging whether the prosthesis can be installed according to the femoral prosthesis quality assessment index includes: A mapping set between the initial threshold of femoral prosthesis quality assessment, the scanning quality assessment value and the prosthetic femoral quality correction parameter is extracted from the femoral prosthesis database, and the prosthetic femoral quality correction parameter is obtained according to the matching of the mapping set. The initial threshold of femoral prosthesis quality assessment and the prosthetic femoral quality correction parameter are simply added to obtain the femoral prosthesis quality assessment index threshold.

10. The method for determining special femoral prosthesis information based on mirror image reconstruction according to claim 9, characterized in that: The step of judging whether the prosthesis can be installed according to the femoral prosthesis quality evaluation index further includes: The femoral prosthesis quality assessment index is compared with the femoral prosthesis quality assessment index threshold. If the femoral prosthesis quality assessment index is higher than or equal to the femoral prosthesis quality assessment index threshold, it is judged that the prosthesis can be installed and the prosthesis is installed. If the femoral prosthesis quality assessment index is lower than the femoral prosthesis quality assessment index threshold, it is judged that the prosthesis cannot be installed and the reasons are analyzed.

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