Author/Authors :
MA, Jian-Xiong Biomechanics Labs of Orthopaedic Institute - Tianjin Hospital, China , MA, Jian-Xiong Tianjin Medical University General Hospital - Department of Biomechanics Labs of Orthopaedic, China , WANG, Jie Tianjin Medical University General Hospital - Department of Biomechanics Labs of Orthopaedic, China , WANG, Jie Biomechanics Labs of Orthopaedic Institute - Tianjin Hospital, China , XU, Wei-Guo Biomechanics Labs of Orthopaedic Institute - Tianjin Hospital, China , YU, Jing-Tao Tianjin Medical University General Hospital - Department of Biomechanics Labs of Orthopaedic, China , YANG, Yang Biomechanics Labs of Orthopaedic Institute - Tianjin Hospital, China , MA, Xin-Long Biomechanics Labs of Orthopaedic Institute - Tianjin Hospital, China , MA, Xin-Long Tianjin Medical University General Hospital - Department of Biomechanics Labs of Orthopaedic, China
Abstract :
Objective: Reverse obliquity intertrochanteric fractures are a challenge for orthopedic surgeons. The optimal internal fixation for repairing this type of unstable intertrochanteric fractures remains controversial. This study aimed to compare the biomechanical properties in axial load and cyclical axial load of proximal femoral nail antirotation (PFNA) and proximal femoral locking compression plate (PFLCP) for fixation of reverse obliquity intertrochanteric fractures. Methods: Sixteen embalmed cadaver femurs were sawed to simulate reverse obliquity intertrochanteric fracture and instrumented with PFNA or PFLCP. Axial loads and axial cyclic loads were applied to the femoral head by an Instron tester. If the implant-femur constructs did not fail, axial failure load was added to the remaining implant-femur constructs. Results: Mean axial stiffness for PFNA was 21.10% greater than that of PFLCP. Cyclic axial loading caused significantly less (p=0.022) mean irreversible deformation in PFNA (3.43 mm) than in PFLCP (4.34 mm). Significantly less (p=0.002) mean total deformation was detected in PFNA (6.16 mm) than in PFLCP (8.67 mm). Conclusion: For fixing reverse obliquity intertrochanteric fractures, PFNA is superior to PFLCP under axial load.
Keywords :
Biomechanical testing , proximal femoral nail antirotation , proximal femoral locking compression plate , reverse obliquity intertrochanteric fractures.
