Jornal de Pesquisa Óssea
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Role of Anti-Rotation Screw In Intertrochanteric Curved Varus Osteotomy: A Finite Element Study

Wei-hua Feng, Hang-hang Zhang, Zheng-Kang

Whether the use of anti-rotation screw is controversial when a transtrochanteric Curved Varus Osteotomy (CVO) is performed fixed with Compression Hip Screw System (CHS) for the treatment of osteonecrosis of the femoral head. The Purpose of the study was to evaluate the role of anti-rotation screw in stress reduction of CHS after CVO fixation quantitively using a finite element method. CVO models with three configurations (15°, 20° and 25°) fixed by CHS with or without anti-rotation screw were established and simulated in initial post-operative stage and finish of bone-healing stage. The von Mises stress of implant was evaluated. High stress level and concentration of stress was present in non-antirotation screw models, and the significant reduction of stress was addressed in anti-rotation models in initial postoperative stage, especially for the large degree CVO model. Anti-rotation screw can reduce the stress level of implant effectively in initial postoperative stage of CVO. we recommended the anti-rotation screw should be a necessary when CVO above 20° is performed to avoid complications