Mahomed N, Harrington I, Kellam J, Maistrelli G, Hearn T, Vroemen J
Sunnybrooke Medical Center, Toronto, Ontario, Canada.
Clin Orthop Relat Res. 1994 Jul(304):280-8.
Nine pairs of human cadaveric femora were used to study the biomechanical characteristics of the Gamma nail and a standard telescoping screw plate implant (Ambi) to determine whether there were any mechanical advantages of one system over the other. Parameters studied included structural stiffness, strain distribution, and failure modes for intertrochanteric and subtrochanteric fractures. There was no significant difference in structural stiffness for stable intertrochanteric and subtrochanteric fractures. The Gamma Nail composites, however, were stiffer than the Ambi for unstable subtrochanteric fractures. Both implants effectively unloaded the proximal medial cortex. In each instance, failure of the Gamma nail composite occurred through the distal locking screws. The Gamma nail does not appear to offer any distinct biomechanical advantage over the sliding hip screw system in the treatment of stable and unstable intertrochanteric fractures, but it may play a role in the treatment of unstable subtrochanteric fractures.
使用九对人体尸体股骨来研究伽马钉和标准伸缩式钢板植入物（Ambi）的生物力学特性，以确定一个系统相对于另一个系统是否具有任何机械优势。所研究的参数包括转子间和转子下骨折的结构刚度、应变分布和失效模式。对于稳定的转子间和转子下骨折，结构刚度没有显著差异。然而，对于不稳定的转子下骨折，伽马钉复合材料比Ambi更硬。两种植入物均有效地减轻了近端内侧皮质的负荷。在每种情况下，伽马钉复合材料的失效均通过远端锁定螺钉发生。在治疗稳定和不稳定的转子间骨折方面，伽马钉似乎没有比滑动髋螺钉系统具有任何明显的生物力学优势，但它可能在治疗不稳定的转子下骨折中发挥作用。
