BIOMECHANICAL STUDY ON PROXIMAL FEMORAL NAIL ANTIROTATION (PFNA) FOR INTERTROCHANTERIC FRACTURE
BIOMECHANICAL STUDY ON PROXIMAL FEMORAL NAIL ANTIROTATION (PFNA) FOR INTERTROCHANTERIC FRACTURE
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DOI：
10.1142/s0219519412005125
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发表时间：
2012-10
影响因子：
0.8
通讯作者：
Lizhen Wang;Feng Zhao;Jingyun Han;Chao Wang;Yubo Fan
中科院分区：
文献类型：
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作者：
Lizhen Wang;Feng Zhao;Jingyun Han;Chao Wang;Yubo Fan
股骨近端髓内钉防旋器（PFNA）是治疗股骨粗隆间骨折的典型内固定物。然而，髓内钉固定后股骨干再骨折的报告经常出现。本研究旨在探讨股骨近端骨折愈合过程中不同阶段的生物力学特征。分析了在步行和爬楼梯时股骨和PFNA的应力应变分布、沿着方向的总应变能密度（SED）。结果表明，PFNA固定后，锁定螺钉孔附近出现明显的应力集中，去除PFNA后，应力集中明显减小。爬楼梯导致锁定螺栓孔处的应变高于正常行走。结论：骨折愈合后不取出PFNA可能导致股骨干锁定螺钉附近骨折的风险较高。同时，愈合期间应避免爬楼梯。
The proximal femoral nail antirotation device (PFNA) is a typical implant to the treatment of intertrochanteric fractures. However, re-fracture of the femur shaft after nailing are usually been reported. The purpose of this study was to investigate the biomechanical features in the healed proximal femur at different stages in the healing process. Stress and strain distributions, total strain energy density (SED) along the femur and PFNA were analyzed in walking and stair climbing. Results showed remarkable stress concentration occurred near the locking bolt hole with retained PFNA, decreased after PFNA removal. Stair climbing resulted in higher strain at the locking bolt hole than normal walking. The conclusion can be drawn that non-removal of PFNA after healing may result in high fractural risk near locking bolt on femoral shaft. Meanwhile, stair climbing should be avoided during healing.