Musgrave D S, Glisson R R, Graham R D, Guilak F, Vail T P
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA.
J Arthroplasty. 1997 Sep;12(6):657-69. doi: 10.1016/s0883-5403(97)90139-x.
The photoelastic method was used to assess the effects on femoral cortical strain of total hip arthroplasty cementless femoral prostheses containing distal coronal slots. Eight cadaveric femurs were tested, although three were eliminated secondary to fractures. Loaded and unloaded cortical strains were determined at 72 points on the implanted femoral cortex and compared with the values obtained in the intact femur. Three different prostheses were sequentially implanted, in a random order, into each femur. The prostheses consisted of a standard solid stem, an identical stem with a coronal slot in its distal one fourth, and an identical stem with a coronal slot in its distal one half. The slotted stems did not enhance axial load transfer to the proximal medial femur but did result in increased proximal medial assembly strains and statistically significant (P < .05) decreased anterior and posterior assembly strains. The increased proximal medial assembly strains are hypothesized to enhance proximal medial femoral loading, while the decreased anterior and posterior assembly strains may minimize operative implantation fractures.
采用光弹性方法评估含远端冠状槽的非骨水泥型全髋关节置换股骨假体对股骨皮质应变的影响。对8具尸体股骨进行了测试，不过有3具因骨折而被排除。在植入的股骨皮质上的72个点测定加载和卸载时的皮质应变，并与完整股骨获得的值进行比较。将三种不同的假体以随机顺序依次植入每根股骨。假体包括一个标准实心柄、一个在其四分之一远端有冠状槽的相同柄，以及一个在其一半远端有冠状槽的相同柄。开槽柄并没有增强轴向载荷向股骨近端内侧的传递，但确实导致近端内侧组件应变增加，且前侧和后侧组件应变有统计学意义的降低（P < .05）。近端内侧组件应变增加被推测会增强股骨近端内侧的负荷，而前侧和后侧组件应变降低可能会使手术植入骨折的风险降至最低。
