Covey D C, Saha S, Lipka J M, Albright J A
Department of Orthopaedic Surgery, Louisiana State University School of Medicine, Shreveport 71130-3932.
Clin Orthop Relat Res. 1990 Mar(252):246-51.
The torsional and compressive biomechanical characteristics of slotted and nonslotted interlocking nails in distal femoral shaft fractures were evaluated. Slotted (Grosse-Kempf) and nonslotted (Russell-Taylor) locked nail systems were implanted in anatomic specimen femora, which were then tested in torsion and axial compression. For torsional studies, each femur was transversely sectioned distal to the isthmus; for axial loading, a distal 3-cm section of bone was removed. The mean peak torsional stiffness of the femora fixed with nonslotted nails was 0.955 Nm per degree, which was significantly greater than that (0.300 Nm per degree) for the femora fixed with the slotted nails. However, when loaded to failure in compression, the nonslotted nail group failed at a mean load of 2490 N compared with 3050 N for the group fixed with the slotted devices. These results could be due in part to the lesser rigidity of the slotted nail, which may have facilitated greater load sharing with bone and increased resistance to compression failure.
对股骨远端骨折中开槽和不开槽交锁髓内钉的扭转和压缩生物力学特性进行了评估。将开槽（Grosse-Kempf）和不开槽（Russell-Taylor）锁定髓内钉系统植入解剖学标本股骨中，然后对其进行扭转和轴向压缩测试。对于扭转研究，每根股骨在峡部远端进行横向切片；对于轴向加载，去除远端3厘米的骨段。用不开槽髓内钉固定的股骨的平均峰值扭转刚度为每度0.955牛米，显著高于用开槽髓内钉固定的股骨（每度0.300牛米）。然而，在压缩至失效时，不开槽髓内钉组的平均失效载荷为2490牛，而开槽装置固定组为3050牛。这些结果可能部分归因于开槽髓内钉的刚度较小，这可能有助于与骨分担更大的载荷并增加对压缩失效的抵抗力。
