Effect of total hip arthroplasty on proximal femoral remodeling
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Q66

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    Abstract:

    Objective Aiming at the problems of prosthesis loosening and dislocation after total hip arthroplasty in the medium and long term, the Wolff bone remodeling theory was used to analyze the influence of total hip arthroplasty on the process of proximal femoral bone remodeling. Methods According to the control equation of bone remodeling, the program of bone remodeling was written in Python language. Preoperative femur model and postoperative femur and prosthesis finite element model were established respectively in ABAQUS software. Results The comparison of stress and density distribution showed that the stress in the proximal femur continued to decrease after the prosthesis was implanted, and the stress site was transferred from the femoral head to the prosthesis, resulting in obvious stress shielding phenomenon. The bone loss in the stress shielding area is serious. The femoral shaft cortical bone thinned and the stress shielding was relieved. The medial side of the bottom of the prosthesis was compressed, and the stress was significantly higher than that of the lateral side, where the bone was unevenly distributed. Conclusions After total hip arthroplasty, the proximal medial side of femur appears obvious stress shielding, leading to bone loss and prosthesis loosening. The difference in stress levels on both sides of the bottom of the prosthesis resulted in uneven bone distribution, which resulted in the discordance between the prosthesis and the femur, resulting in postoperative pain in the middle part of the thigh.

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History
  • Received:November 29,2020
  • Revised:March 21,2021
  • Adopted:March 24,2021
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