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Application of three-dimensional finite element model in the developmental dysplasia of the hip complicated by femoral head necrosis |
SONG Zhigang |
Department of Radiology, Fushun Hospital of Traditional Chinese Medicine, Liaoning Province, Fushun 113000, China |
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Abstract Developmental dysplasia of the hip can lead to hip dysfunction and even osteonecrosis of the femoral head, traditional imaging examination can not predict and reflect the condition comprehensively and timely. The three-dimensional finite element model, using image data combined with finite element mechanics, can simulate the stress condition of the proximal femur in different scenes and build model so as to provide a scientific solution for the treatment. The modeling experiment of developmental dislocation of the hip shows that establishing abduction angle is 80°, femoral head on the surface stress increases obviously, acetabulum stress than bone tissue to yield maximum intensity of stress directly affects internal vascular blood flow of the femoral head, the femoral head is prone to necrosis and collapse, the abduction angle should not exceed 80° during treatment. Establishment of prediction model of osteonecrosis of the femoral head reveals when the angle limite central is over 25°, there would be stress concentration points at the edge of the acetabulum, cartilage compression, leading to osteonecrosis of the femoral head. Therefore, the correctional treatment should be based on the restoration of the angle limite central to radiological “normal” range. According to the clinical classification of patients in the “severe, moderate, mild” situation, the best correction angle limite central should follow the law from small to large, which can get a satisfactory therapeutic effect.
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