How much of the superolateral femoral neck should be removed in intramedullary nail fixation for intertrochanteric fracture?

The objective of this study was to measure how much of the superolateral femoral neck should be removed to reduce the incidence of wedge effect. Simulating surgery: Computed Tomography images of 131 intertrochanteric fracture patients were included, three-dimensionally reconstructed, virtually reduced and implanted with Proximal Femoral Nail Antirotation blade-Ⅱ(PFNA-Ⅱ) nail. The antero-posterior length and media-lateral width of the intersection between superolateral femoral neck and PFNA-Ⅱ nail were measured. Retrospective study: The pre- and postoperative CT of 30 patients were collected. The average varus angle of the neck-shaft angle and the correlation between the angles and the difference in the actual and estimated width of the fragments removed were measured. Models of 108 patient were selected for analysis. The average antero-posterior length and media-lateral width were 14.46 mm (14.00-14.93 mm) and 9.33 mm (8.79-9.87 mm), respectively. The AO/OTA classification was not significantly associated with the outcome, but the gender was. In the retrospective study, the mean value of the varus angles was -4.58° (SE = 6.85°), and the difference of width was strongly positively correlated with the varus angle with a correlation coefficient of 0.698. Results obtained in this study can improve the understanding of this region and help surgeons to make appropriate preoperative planning to reduce the incidence of wedge effect. Retrospective study provided effective proof of the reliability of this study.

Comparison of different internal fixation models in ankle arthrodesis using 3D finite-element analysis.

BACKGROUND: The purpose of this study is to use three-dimensional finite-element analysis to better understand the biomechanical features of various internal fixators for ankle arthrodesis. METHODS: We used finite-element analysis to compare four different types of internal fixations in ankle arthrodesis: Group A had three crossed screws (Ø6.5 mm); Group B had two crossed screws (Ø6.5 mm) and an anterior plate (Ø2.7 mm); Group C only had an anterior anatomical plate (Ø3.5 mm); Group D had one anterior anatomical plate (Ø3.5 mm) and one posterior-lateral screw (Ø6.5 mm). We adopted Ansys 21.0 software to analyze and compare the four types in terms of the displacement of the arthrodesis surface and the stress peak and stress distribution of these models under intorsion, extorsion, dorsiflexion torque, and neutral vertical load. RESULTS: ① Displacement of the arthrodesis surface: In Group A, the maximum displacement was larger than Group D under neutral vertical load and dorsiflexion torque but less than it under intorsion and extorsion torque. In Group B, the maximum displacement against dorsiflexion, neutral vertical load, intorsion, and extorsion was less than that in the other three fixation models. In Group C, the maximum displacement against the above four loading patterns were significantly higher than that in another three fixation models. ② Stress peak and stress distribution: based on the stress distribution of the four models, the peak von Mises stress was concentrated in the central sections of the compression screws, plate joints, and bending parts of the plates. CONCLUSIONS: The fixation model consisting of two crossed screws and an anterior outperformed the other three fixation models in terms of biomedical advantages; thus, this model can be deemed a safe and reliable internal fixation approach for ankle arthrodesis.

[Short-term efficacy of digitally-assisted traditional Chinese medicine manual reduction combined with 3D printed splint in the treatment of AO type-A distal radius fractures].

Objective To explore the short-term efficacy of digitally-assisted traditional Chinese medicine manual reduction combined with 3D printed splint in the treatment of AO type-A distal radius fractures, and explore the quantification of traditional Chinese medicine manual reduction and personalized improvement of splinting. Methods The clinical data of 50 patients with AO type-A distal radius fractures, who received treatment at the outpatient department of Cangzhou Integrated Traditional Chinese and Western Medicine Hospital in Hebei Province, were retrospective analyzed. The patient cohort included 22 females and 28 males, with ages ranging from 25 to 75 years old. Among them, 27 cases presented with distal radius fractures on the left side, and 24 cases on the right side. The patients were categorized into two groups: treatment group (n=25) and control group(n=25). There were 13 males and 12 females in the treatment group, with an average age of (56.2±5.5) years old. Treatment approach for this group involved several steps. Initially, Mimics Research software was used to conduct comprehensive analysis of complete CT data from the affected limb, resulting in the creation of a three-dimensional model. Subsequently, 3D models of the bones and skin contours, stored as STL format files, were imported into the Materialise Magics 23.0 software for model processing and repair. This facilitated the simulation of reduction and recording of displacement data, effectively generating a "digital prescription" to guide and quantify traditional Chinese medicine manipulation procedures. Finally, a personalized 3D printed splint was applied for fixation treatment. There were 15 males and 10 females in the control group, with an average age of (53.32±5.28) years old. These patients were treated with manualreduction combined with traditional splinting. The clinical efficacy of the two groups was assessed in terms of fracture reduction quality, fracture healing time, Gartland-Werley wrist joint score and X-ray parameters (palminclination angle, ulnar deviation angle, radius height) at 6 weeks post-operatively. Results The treatment group exhibited a shorter duration for achieving clinical healing compared to the control group (P<0.05). Six weeks post-operatively, the treatment group demonstrated higher wrist joint function scores, and a higher proportion of excellent and good outcomes than the control group(P<0.05). The treatment group was superior to the control group in terms of imaging parameters 6 weeks post-operatively (P<0.05). Conclusion By quantifying skin contours through digital simulation prescription reduction, a personalized 3D printed splint is developed to effectively stabilize fractures, enhancing localized fixation while ensuring greater adherence, stability, and comfort. This innovative approach offers personalized treatment for AO type-A distal radius fractures and presents a novel, precise treatment strategy for consideration.

Short-term efficacy of digitally-assisted traditional Chinese medicine manual reduction combined with 3D printed splint in the treatment of AO type-A distal radius fractures / 中国骨伤

Objective To explore the short-term efficacy of digitally-assisted traditional Chinese medicine manual reduction combined with 3D printed splint in the treatment of AO type-A distal radius fractures, and explore the quantification of traditional Chinese medicine manual reduction and personalized improvement of splinting. Methods The clinical data of 50 patients with AO type-A distal radius fractures, who received treatment at the outpatient department of Cangzhou Integrated Traditional Chinese and Western Medicine Hospital in Hebei Province, were retrospective analyzed. The patient cohort included 22 females and 28 males, with ages ranging from 25 to 75 years old. Among them, 27 cases presented with distal radius fractures on the left side, and 24 cases on the right side. The patients were categorized into two groups: treatment group (n=25) and control group(n=25). There were 13 males and 12 females in the treatment group, with an average age of (56.2±5.5) years old. Treatment approach for this group involved several steps. Initially, Mimics Research software was used to conduct comprehensive analysis of complete CT data from the affected limb, resulting in the creation of a three-dimensional model. Subsequently, 3D models of the bones and skin contours, stored as STL format files, were imported into the Materialise Magics 23.0 software for model processing and repair. This facilitated the simulation of reduction and recording of displacement data, effectively generating a "digital prescription" to guide and quantify traditional Chinese medicine manipulation procedures. Finally, a personalized 3D printed splint was applied for fixation treatment. There were 15 males and 10 females in the control group, with an average age of (53.32±5.28) years old. These patients were treated with manualreduction combined with traditional splinting. The clinical efficacy of the two groups was assessed in terms of fracture reduction quality, fracture healing time, Gartland-Werley wrist joint score and X-ray parameters (palminclination angle, ulnar deviation angle, radius height) at 6 weeks post-operatively. Results The treatment group exhibited a shorter duration for achieving clinical healing compared to the control group (P<0.05). Six weeks post-operatively, the treatment group demonstrated higher wrist joint function scores, and a higher proportion of excellent and good outcomes than the control group(P<0.05). The treatment group was superior to the control group in terms of imaging parameters 6 weeks post-operatively (P<0.05). Conclusion By quantifying skin contours through digital simulation prescription reduction, a personalized 3D printed splint is developed to effectively stabilize fractures, enhancing localized fixation while ensuring greater adherence, stability, and comfort. This innovative approach offers personalized treatment for AO type-A distal radius fractures and presents a novel, precise treatment strategy for consideration.

Distal Humerus Morphological Analysis of Chinese Individuals: A Statistical Shape Modeling Approach.

OBJECTIVE: A detailed analysis of the morphology of distal humeral articulation can help in the creation of anatomic prostheses of hemiarthroplasty. This study used statistical shape modeling to evaluate the 3D morphology of the distal humerus in healthy Chinese individuals and to investigate the proper articular morphology differences. METHODS: A statistical shape model (SSM) of the distal humerus was created using CT scans of 106 survey-confirmed nonpathologic elbows. In addition, the articular components of each principal component (PC) were selected and fitted on the mean mode. The Euclidean point-to-mesh distance of articular modes was calculated as a measurement the proper change in the morphology of the articulation. RESULTS: The first seven PCs jointly accounted for 80.9% of the total variation (44.4%, 12.2%, 7.9%, 5.9%, 4.1%, 3.4% and 3%, respectively). In the mean model, the distance between the medial and lateral epicondyles was 57.4 mm, the width of the articulation was 42.1 mm, and the angle of the transepicondylar line (TEL) and C line was 4.8°. The articular surface differences of the first PC were significant (RMS: 1.43 mm in the -3 SD model and 2.38 mm in the +3 SD model), whereas under other conditions, the differences were not remarkable despite the maximum deformation not exceeding 1 mm. CONCLUSION: A novel method (SSM) was used to evaluate the 3D morphology of the distal humerus in healthy Chinese individuals and investigate the proper articular shape differences. We found the proper shape of articular surface basically transformed into one variation pattern which was relevant to the bone size, even though the morphology of distal humerus possessed complicated variation modes. The findings of this study can be helpful to design the next generation of elbow hemiarthroplasty in the future.

[Current status and progress of locking plate in the treatment of distal femoral comminuted fracture].

OBJECTIVE: To review the current status and progress of locking plate for the treatment of distal femoral comminuted fractures. METHODS: The related literature was extensively reviewed to summarize the current status and progress in the treatment of distal femoral comminuted fracture with locking plate from four aspects: the current treatment situation, the shortcomings of locking plate and countermeasures, the progress of locking technology, locking plate and digital orthopedic technology. RESULTS: Treatment of distal femoral comminuted fractures is challenging. Locking plates, the most commonly used fixation for distal femoral comminuted fractures, still face a high rate of treatment failure. Double plates can improve the mechanical stability of comminuted fractures, but specific quantitative criteria are still lacking for when to choose double plates for fixation. The far cortial locking screw has shown good application value in improving the micro-movement and promoting the growth of callus. The biphasic plating is a development of the traditional locking plate, but needs further clinical examination. As an auxiliary means, digital orthopedic technology shows a good application prospect. CONCLUSION: The inherent defect of locking plate is a factor that affects the prognosis of distal femoral comminuted fracture. The optimization of locking technology combined with digital orthopedic technology is expected to reduce the failure rate of treatment of distal femoral comminuted fracture.

[Progress in clinical application of 3D printed navigational template in orthopedic surgery].

Orthopedic 3D printed surgical navigational template is an instrument that is prepared by 3D reconstruction based on preoperative radiological data of the patient using computer-aided design (CAD) and 3D printing techniques. The 3D printed navigational template allows accurate intra-operative assessment of the relative spatial distance, angular relationship, direction and depth. The application of 3D printed navigational template technique in orthopedics surgeries achieves the conversion of preoperative planning from 2/3D graphics to 3D models, and provides a new method for individualized and precise treatment. Herein we review the evolution, clinical application, and basic classification of 3D printed navigation template technique, analyze its advantages and disadvantages, and discuss the current problems and the future development of this technique.

Three-dimensional finite element analysis of fibula implantation for China-Japan friendship hospital type osteonecrosis of femoral head / 中国组织工程研究

BACKGROUND: It is reported that the hip-conserving effect of osteonecrosis of femoral head is closely related to the retention of lateral column. The classification of China-Japan Friendship Hospital is based on the three-column structure, and the prediction accuracy of femoral head collapse is high. OBJECTIVE: To establish a three-dimensional finite element model for China-Japan Friendship Hospital classification of femoral head necrosis, and to analyze the mechanical changes of fibula implantation in each classification by finite element method, and to explore the significance of lateral column retention in hip preservation, so as to provide a basis for precise prediction of collapse of the classification. METHODS: Three groups of 11 kinds of three-dimensional finite element models of normal femoral head, China-Japan Friendship Hospital type femoral head necrosis (type M, type C, type L1, type L2, type L3) and fibula implantation were established. The finite element analysis was carried out by ANSYS software. The maximum stress, maximum displacement and load transfer mode of proximal femur were observed in each group. RESULTS AND CONCLUSION: (1) In the necrosis group, the strain was the largest, and the displacement was different due to the different types of necrosis. The displacement changes were as follows: Type M < type C < type L1 = type L2 < type L3. The displacement recovery of fibula implantation group was lower than that of the normal group, and the displacement recovery was different due to the different necrosis types. The displacement changes were as follows: Type M < type C < type L1 < type L2 < type L3. The reduction range of the displacement of the repaired necrotic femoral head gradually decreased from the lateral column to the medial column, which was lower than the maximum displacement of the normal femoral head. (2) The peak value of the stress nephogram of the loading area of the femoral head after necrosis was higher than that of the normal group. The peak value of necrotic type M was nearly normal. The peak value of necrotic type C was 74.5% higher than that of the normal group, and the peak value of necrotic type L was more than 100% higher than that of the normal group. The peak value of necrotic type M after operation was not only 14.2% lower than that before operation, but also was lower than that of the normal group. The peak value of necrotic type C after operation was 5.3% lower than that before operation, but higher than that of normal group. The peak value of necrosis type L after operation was lower than that before operation, but significantly higher than the normal level. (3) The load transfer in the normal femoral head was continuous. The conduction path was from the lateral column of the femoral head to the femoral moment. In the necrosis group, the internal load transfer of types M and C femoral head was continuous, and the conduction of type M was basically consistent with normal. The stress of type C conduction to femoral moment was reduced. The load transfer of L1, L2 and L3 type femoral head was interrupted. The stress changed in cliff type, and was unable to transmit to femoral moment, resulting in stress concentration in load area of the femoral head. A certain effective load transfer mode was reconstructed in the femoral head of the fibula implantation group, and the stress concentration at the femoral moment occurred in all types of conduction. Part of the load was transferred to the femoral moment through fibula, and the normal load transfer mode was partially restored. (4) China-Japan Friendship Hospital type fibula placement can prevent the collapse of the femoral head to a certain extent. The location and size of the necrosis area are very important. The closer the necrosis is to the lateral column, the easier it is to collapse and the more difficult it is to repair. The retention of the lateral column is an important factor for accurate prediction of the collapse of the femoral head.

Effect of meniscus injury on the biomechanical properties of knee joint under gait cycle / 中国组织工程研究

BACKGROUND: The biomechanical characteristics of knee meniscus have been studied extensively at home and abroad, but most of them focus on the knee flexion motion. The finite element analysis of biomechanics of knee joint meniscus under the complete gait cycle is not yet perfect. OBJECTIVE: To understand the mechanism of biomechanical changes after meniscus injury in the complete gait cycle by comparing the lateral meniscus tear model with the healthy meniscus model. METHODS: Based on the CT scan data of healthy adult knee joints, a finite element model of healthy knee joint including tibia, meniscus and articular cartilage was established. The lateral meniscus tear of knee joint was constructed based on the healthy model. The biomechanical mechanism of lateral meniscus tear in the knee during complete gait cycle was explored and compared with the healthy knee model. RESULTS AND CONCLUSION: (1) The instantaneous stress variation of the tibia cartilage during the complete gait cycle was consistent in both models. The tibial cartilage stress at each instant in the meniscus tear model was higher than that of the healthy meniscus model. The maximum stress values of tibia cartilage in the meniscus tear model and the healthy meniscus model was 30 and 20.5 MPa. (2) The instantaneous stress variation of the meniscus during the complete gait cycle was consistent in both models. The meniscus stress at each instant in the meniscus tear model was higher than that of the healthy meniscus model. The maximum stress values of meniscus in the meniscus tear model and the healthy meniscus model was 69.8 and 41.3 MPa. (3) In the first 60% of the gait cycle, the maximum stress distribution of the tibia cartilage in the meniscus tear model was much larger than that in the healthy model, and as the gait cycle grew, the contact range gradually spread to the outer edge of the cartilage. After 60% of the gait cycle, the stress on the tibia cartilage was small, and the distribution range of the maximum stress was also small. (4) The stress distribution of the healthy medial meniscus was basically the same in the two models, while the maximum stress distribution of the torn outer meniscus was wider than that of the healthy medial meniscus. A more severe stress concentration phenomenon occurred around the crack, and with the gait cycle, the stress concentration area gradually shifted toward the crack near the anterior corner of the meniscus. (5) These results suggest that the meniscus is an important load-bearing component in human knee joint. From the perspective of biomechanics, the hazard of the meniscus injury on the human knee joint can be observed more intuitively.

Progress in clinical application of 3D printed navigational template in orthopedic surgery / 南方医科大学学报

Orthopedic 3D printed surgical navigational template is an instrument that is prepared by 3D reconstruction based on preoperative radiological data of the patient using computer-aided design (CAD) and 3D printing techniques. The 3D printed navigational template allows accurate intra-operative assessment of the relative spatial distance, angular relationship, direction and depth. The application of 3D printed navigational template technique in orthopedics surgeries achieves the conversion of preoperative planning from 2/3D graphics to 3D models, and provides a new method for individualized and precise treatment. Herein we review the evolution, clinical application, and basic classification of 3D printed navigation template technique, analyze its advantages and disadvantages, and discuss the current problems and the future development of this technique.

Mechanical simulation analysis of static finite element models of the femur with different material assignments / 中国组织工程研究

BACKGROUND: Different bone materials have different properties. Therefore, to simplify the model and improve the analysis efficiency in biomechanical analysis, many scholars have adopted different assignment methods to the bone model in the biomechanical simulation research. The distribution of material properties will have a great influence on the results of biomechanical analysis. OBJECTIVE: Three kinds of finite element models of the femur were established by different material attribute assignment methods, and the finite element simulation analysis was carried out to explore the influence of different material assignment methods on the biomechanical simulation analysis of femur finite element. METHODS: Volunteer femur CT scanning data were collected and imported into Mimics medical image processing software in DICOM format to reconstruct the femur model. Three different material attributes were assigned to the models, including uniform material assignment, skin cancellous bone assignment and gray scale assignment. The models were imported into finite element analysis Abaqus 6.14 software to set the same load and boundary conditions for stress and displacement analysis. RESULTS AND CONCLUSION: (1) The stress values of the three kinds of models differed slightly and were all in a reasonable range. (2) Whereas, the maximum stress of homogeneous assigned model and the model assigned according to cortical-cancellous bone assembly model mainly distributed in the diaphysis region, while the maximum stress distributed in the femoral neck region for the gray value assigned model. (3) The displacement value of cortical-cancellous bone assigned model was essentially in agreement with the gray value assigned model. The homogeneous assigned femoral model possessed the minimum displacement value and the value was about 40% different from the other two models. (4) The grayscale method can better reflect the biomechanical characteristics of human femur, so as to more accurately simulate the real biomechanical characteristics of real femur, which also provides an important theoretical basis for the finite element simulation modeling of orthopedic biomechanics.

Artificial Intelligence, Machine Learning, Deep Learning, and Cognitive Computing: What Do These Terms Mean and How Will They Impact Health Care?

This article was presented at the 2017 annual meeting of the American Association of Hip and Knee Surgeons to introduce the members gathered as the audience to the concepts behind artificial intelligence (AI) and the applications that AI can have in the world of health care today. We discuss the origin of AI, progress to machine learning, and then discuss how the limits of machine learning lead data scientists to develop artificial neural networks and deep learning algorithms through biomimicry. We will place all these technologies in the context of practical clinical examples and show how AI can act as a tool to support and amplify human cognitive functions for physicians delivering care to increasingly complex patients. The aim of this article is to provide the reader with a basic understanding of the fundamentals of AI. Its purpose is to demystify this technology for practicing surgeons so they can better understand how and where to apply it.

Three-dimensional finite element model of the new artificial lumbar disc replacement / 中国组织工程研究

BACKGROUND:As lumbar spine biomechanics research is unceasingly thorough and the constant development of related fusion and dynamic fixation device, the spine fusion technique which is represented by artificial disc replacement is a new choice to the spine surgeons. Therefore, it is particularly important to design reasonable artificial intervertebral disc. OBJECTIVE:To establish the finite element model of the new artificial disc replacement of the lumbar motion segment for further biomechanical study. METHODS:The L3-4 thin-section CT images of a healthy male volunteer was selected, combined with human anatomy data and applied the reverse engineering technology to rebuild the lumbar spine model with medical image software Mimics and tool software Geomagic Studio. The three-dimensional model of the silicone artificial disc was converted into a finite element model through software ANSYS12.0. RESULTS AND CONCLUSION:Through CT scanning, digital image processing and computer-aided design, the three-dimensional model of the lumbar motion segment and the finite element model of artificial disc replacement were successful y established. The finite element model contained 691 085 units and 1 008 913 nodes which could be applied constraint and load and could be used for spinal biomechanics and the further research of the new artificial intervertebral disc.

Finite element analysis of degenerative scoliosis biomechanics / 中国组织工程研究

BACKGROUND:Spine is relatively complex in structure, shape, material properties, and load bearing. The traditional biomechanical method cannot solve these problems. OBJECTIVE:To investigate the stress distribution of intervertebral disc, zygapophysial joints and vertebral body of degenerative scoliosis, and to provide accordance to the biomechanical mechanism of degenerative scoliosis occurrence and development. METHODS:Based on the successive CT images of spinal column from T12 to superior segment of S1 of degenerative scoliosis patients, the special material properties were attributed to the model to form the integrated and effective three-dimensional finite element model of degenerative scoliosis. The model was loaded on the anteflexion, extension, left lateral bending, right lateral bending, left rotation and right rotation conditons. Then the spinal activity and the stress distribution of intervertebral disc, vertebral body and articular cartilage of zygapophysial joints were calculated and analyzed. RESULTS AND CONCLUSION:The spinal activities of degenerative scoliosis finite element model were less than those of common lumbar spine. The stress distribution of intervertebral disc was inclined to the verge of it and the greatest stress was appeared on the extension motion. The apex of scoliosis was the place of stress concentration and the obvious stress concentration of articular cartilage of zygapophysial joints was appeared on the rotation motion, then fol owed by the extension motion, especial y that of articular cartilage of zygapophysial joints on the apex of scoliosis. Stress concentration is easily appeared on the apex of scoliosis, and the extension and rotation motion can aggravate the development of degenerative scoliosis.

Construction and identification of humerus three-dimensional finite element model in children / 中国组织工程研究

BACKGROUND:Mechanical experiment of finite element numerical simulation is the effective method to research the biomechanical structure of human body. OBJECTIVE:To establish the three-dimensional finite element model of a normal 6-year-old child’s humerus. METHODS:CT images of a 6-year-old child volunteer were imported to the Mimics 10.01 software. The threshold segmentation method was used to rebuild the humerus three-dimensional model. The surface optimization treatment and surface patches dicision were performed on the surface of the model with Geomagic Studio 12.0 software. Then the mesh generation was completed in the software TrueGrid. Final y, the material properties were set and the finite element model was completed. The boundary conditions and constrains were exerted to simulate the three-point-bending test of humeurs. After the simulation, the results were outputted. RESULTS AND CONCLUSION:The humerus finite element model included 3 024 nodes and 18 758 nodes-hexahedron elements. The 0.01 m/s and 3 m/s dynamic loads were loaded respectively, then the central humerus fracture occurred and the load-displacement curve was close to the cadaver test results. The simulation results show that the simulation results of children humerus finite element model are close to the cadaver’s test, and the finite element simulation method can simulate the physical properties of the human skeleton very wel .

Precise mechanical analysis on the femoral three-dimensional finite element model constructed based on DICOM data / 中国组织工程研究

BACKGROUND:The finite element model has been developed from two-dimensional model to three-dimensional model, from linear model to nonlinear model. As the advantage of this method in the analysis of mechanical characteristics of the irregular objects, the finite element model has been widely used in the research of orthopedic biomechanics, especial y in the research of hip joint. OBJECTIVE:To analyze the stress state of human femur with finite element analysis method and to investigate a method that can rapidly construct femoral finite element model and precisely analyze the biomechanics. METHODS:Normal male femur was used as specimen for CT scan to obtain cross-sectional images of femur in each slice. Three-dimensional reconstruction was performed with DICOM data and MIMICS software, then the femoral three-dimensional finite element model was established with the finite element analysis ABQUS 6.8 software, and the stress distribution of the model was analyzed under loading condition. RESULTS AND CONCLUSION:Based on DICOM data, three-dimensional finite element model of femur was constructed more quickly and precisely. The models were divided into 38 636 nodes and 201 422 units. The model included the parts of cortical and cancel ous bone. The biomechanical test results were accorded with the previous results, so the model could objectively reflect the real femur shape and biomechanical behavior with high precision. The Mimics software provided a simpler and effective method for the construction of femur model and improved the efficiency of modeling, and the three-dimensional finite element model based on DICOM data was accurate in shape and can be used for the normal research on biomechanical behavior of femur. The stress distribution analyzed with ABQUS 6.8 software is consistent with the clinical observation.