Karol L A, Doane R M, Cornicelli S F, Zak P A, Haut R C, Manoli A
Department of Orthopaedic Surgery, Wayne State University School of Medicine, Detroit, Michigan.
J Pediatr Orthop. 1992 Nov-Dec;12(6):741-5. doi: 10.1097/01241398-199211000-00008.
Slipped capital femoral epiphyses (SCFE) were created in 10 pair of bovine femurs. Each pair was pinned with a single screw on one side and two screws contralaterally. The specimens were reloaded to failure. Double pin fixation yielded only a 33% increase in stiffness as compared with single pin fixation. Resistance to further slip was not proportional to screw number. The stiffness of neither double nor single screw fixation approximated that of the intact physis. Single screw fixation in slipped epiphyses is recommended because the small gains in stiffness with a second screw do not offset the risk of complications.
在10对牛股骨上制造了股骨头骨骺滑脱（SCFE）模型。每对股骨一侧用单枚螺钉固定，对侧用两枚螺钉固定。对标本重新加载直至破坏。与单枚螺钉固定相比，双枚螺钉固定的刚度仅增加了33%。防止进一步滑脱的阻力与螺钉数量不成正比。双枚螺钉固定和单枚螺钉固定的刚度均未接近完整骺板的刚度。建议在骨骺滑脱时采用单枚螺钉固定，因为增加一枚螺钉所带来的刚度微小增加并不能抵消并发症的风险。
