1F12 Estimation of the joint force by model calculations and finite element analysis of acetabular shelf artroplasty

The acetabular dysplasia is pathological condition that acetabulum is incomplete growth compared to healthy people. In everyday life movement of the hip joint is indispensable and life while always felt the pain and discomfort is significant failure. Further, by that operation to protect the hip by pain, which can cause a secondary disability. A variety of treatments exist for acetabular dysplasia. The acetabular shelf arthroplasty is also one of them. It is a surgery to increase the load area transplanted with autologous bone. It has feature that is excellent in improving postoperative pain. In this study, we constructed a novel three-dimensional trunk musculoskeletal model using data from computed tomography (CT) and magnetic resonance imaging (MRI). Using it was estimated joint force of the hip of a subject. And subjected to acetabular shelf arthroplasty in a patient with acetabular dysplasia, create a 3D model from CT images of postoperative preoperative, subjected to mechanical evaluation by using the finite element method. As a result, the variance of the stress in the hip joint surface has been confirmed. It can be said that the acetabular shelf arthroplasty is an effective means for acetabular dysplasia.