The effect of the necrotic area on the biomechanics of the femoral head - a finite element study.

摘要: Femoral head collapse is the key to progress of osteonecrosis femoral (ONFH), but causes are not completely clear. The better understanding will guide treatment strategy for ONFH patients. purpose this study was evaluate biomechanical influence necrosis area on by finite element analysis. CT and MRI data from hip joint a healthy volunteer were collected establish (FE) model normal hip. Subsequently, five categories FE models established using computer software according China-Japan Friendship Hospital (CJFH) classification ONFH. CJFH system includes types based size location lesions in (type M, C, L1, L2, L3) stage indices each analyzed method, including displacement, peak von Mises stress index simulated necrotic as well lateral pillar contact acetabular. (1) displacement increments areas type L3 3.75 μm, 8.24 μm, 8.47 μm, 18.42 μm, 20.44 μm respectively; decrements 1.50 MPa, 3.74 MPa, 3.73 MPa, 4.91 MPa, 4.92 MPa 0.04, 0.08, 0.27, 0.27 respectively. (2) significantly different (P < 0.001) increased sequence follows: 1.93 ± 0.15 μm, 5.74 ± 0.92 μm, 5.84 ± 1.42 μm, 14.50 ± 3.00 μm, 16.43 ± 3.05 μm. also 0.52 ± 0.30 MPa, 0.55 ± 0.12 MPa, 0.67 ± 0.33 MPa, 4.17 ± 0.59 MPa, 4.19 ± 0.60 MPa. (3) L2 markedly higher than those L1 (P < 0.001). heads L1. Different result varied impact collapse.