نوع مقاله : گزارش مورد
نویسندگان
گروه مکانیک/گروه پژوهشی ارتوپدی بیومکانیک، دانشکده مهندسی، دانشگاه بیرجند، بیرجند، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Background and Aims In patients with developmental dysplasia of the hip, shelf acetabuloplasty is a common surgical procedure aimed at improving the coverage of the acetabulum over the femoral head. So far, shelf acetabuloplasty has not been performed using preoperative planning, aiming to optimize morphological and biomechanical parameters and evaluate the design with finite element analysis. This study aims to conduct a finite element analysis of the hip joint before and after shelf acetabuloplasty, contingent upon optimizing biomechanical and morphological parameters during preoperative planning. In these patients, inadequate coverage can lead to stress concentration in the articular cartilage due to reduced weight-bearing area, resulting in osteoarthritis.
Methods The case study is a patient with challenging right hip dysplasia whose preoperative planning was performed in a 3-D environment to optimize the morphological and biomechanical parameters of the patient’s hip joint. The joint force was calculated after extracting 3-D models, aligning the pelvis in the functional coordinate system, and registering the femur on the patient’s standing radiograph. Then, the stress distribution on the articular surface of the acetabulum before and after surgery was investigated, considering soft tissue and using the finite element method.
Results Finite element analysis indicated that the maximum von Mises stress on the acetabular articular surface decreased from 4.86 MPa preoperatively to 3.17 MPa postoperatively, representing a reduction of 34.77%. Additionally, the contact pressure on the acetabular cartilage was reduced from 5.94 MPa preoperatively to 3.77 MPa postoperatively, equivalent to a decrease of 36.53%.
Conclusion The results showed that preoperative planning, aimed at improving morphological and biomechanical parameters, can postoperatively reduce stress in the articular surfaces and contact pressure in the acetabular cartilage.
کلیدواژهها [English]
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