Evaluation for the causes of a femoral neck fracture in hip resurfacing arthroplasty –A finite element study

• Main Authors: Shou-Hao CHen, 陳首豪
• Other Authors: Wenlung Li
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/m8gw44

碩士 === 國立臺北科技大學 === 製造科技研究所 === 100 === With advancements in industrial technologies, resurfacing artificial hip has developed, unlike total hip in the past consumed by unnecessary human bone, the extent of surgery has become a small recovery faster by the medical trend, significant research effort has been devoted to total hip resurfacing arthroplasty and clinical trials have been performed in many countries. Thus, the technology is already mature. The increased use of total hip resurfacing arthroplasty is consistent with current trends in medical science. It provides patients with an alternative to total hip arthroplasty. However, clinical trials suggest there are still some issues with total hip resurfacing arthroplasty. Our study analyzes the factors that causes cause failures in the implants, resulting in aseptic loosening and femoral neck fractures. Total hip resurfacing arthroplasty technology is very important for biomechanics, and the implant angle is especially significant. Previous research studies suggest that the implant valgus angle is significant for the overall effectiveness of the total surface replacement artificial hip joint system. Previous studies on implant angles are limited to the 2-D plane, resulting in discrepancies compared to actual surgical conditions. This study also considers the importance of the anteversion angle of the femoral bone in total surface-replacement hip resurfacing arthroplasty. Based on the implant valgus angle, the best implant angle is obtained. Finite element analysis is performed on the location data for scientific verification. This analysis will serve as a reference for clinical surgeons during surgeries. The results of this study suggest that the valgus of an implant does not lead to increased risk of femoral neck fractures. Simulations showed the effect of stress concentration at the bottom of the implant. This may reduce the femoral stress shielding effect, causing failure of the hip replacement. Changes in the nature of different bone will affect the position of maximum stress. When cortical bone and cancellous bone is too large difference, would make the increase in femoral neck stress to fracture risk. This proves that it is possible to cause osteonecrosis will be decline young''s modulus of femoral neck fracture. The anteversion angle is associated with femoral neck section. Choose implant anteversion angle must be to know femoral neck section. In addition, if the valgus angle is greater than 15 degrees, the joint may fail during operation. Thus, we suggest that the suitable valgus angle for the implant is between 5 and 10 degrees.