Segal Lee S, Jacobson Justin A, Saunders Marnie M
Department of Orthopaedics and Rehabilitation, The Pennsylvania State University College of Medicine, The Milton S. Hershey Medical Center, Hershey, USA.
J Pediatr Orthop. 2006 Jul-Aug;26(4):479-85. doi: 10.1097/01.bpo.0000226285.46943.ea.
Slipped capital femoral epiphyses (SCFE) were created in 24 pairs of immature bovine femurs. In 17 pairs of femurs, the slip was left nonreduced (one-third diameter of physis), and in 7 pairs, the slip was reduced. Stabilization of the slips was with either 1 or 2 threaded 6.5-mm screws in a compression mode. The specimens were subjected to shear or torsional loading forces to failure, with the goal of trying to reproduce clinical conditions of in situ screw fixation for acute or unstable SCFE. In the nonreduced model, double-screw fixation was 312% stiffer than single-screw fixation under torsional loading. In the reduced model, double-screw fixation was 137% stiffer than single-screw fixation under torsional loading. The increased rotational stability of double-screw fixation under torsional loading conditions may justify its use in in situ stabilization of acute or unstable SCFE.
在24对未成熟牛股骨上制造了股骨头骨骺滑脱（SCFE）。在17对股骨中，滑脱未复位（骺板直径的三分之一），在7对股骨中，滑脱进行了复位。滑脱的稳定通过以加压模式使用1枚或2枚6.5毫米带螺纹螺钉实现。对标本施加剪切或扭转加载力直至破坏，目的是试图重现急性或不稳定型SCFE原位螺钉固定的临床情况。在未复位模型中，在扭转加载下，双螺钉固定比单螺钉固定刚度高312%。在复位模型中，在扭转加载下，双螺钉固定比单螺钉固定刚度高137%。双螺钉固定在扭转加载条件下增加的旋转稳定性可能证明其可用于急性或不稳定型SCFE的原位稳定。
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