Acar Baver, Kose Ozkan, Kati Yusuf Alper, Egerci Omer Faruk, Turan Adil, Yuksel Halil Yalcın
Antalya Education and Research Hospital, Department of Orthopaedics and Traumatology, Antalya 07100, Turkey.
Antalya Education and Research Hospital, Department of Orthopaedics and Traumatology, Antalya 07100, Turkey.
Orthop Traumatol Surg Res. 2018 Nov;104(7):1107-1113. doi: 10.1016/j.otsr.2018.07.013. Epub 2018 Sep 1.
PURPOSE: Scaphoid waist fractures may be fixed through volar or dorsal screw fixation. However, there is no consensus on which surgical fixation method should be performed. The purpose of this study was to compare volar versus dorsal screw fixation of scaphoid waist fractures under physiological loading conditions utilizing finite element analysis. METHODS: A transverse scaphoid waist fracture (Herbert type B2) model was fixed with a headless cannulated compression screw using either a volar or dorsal approach. Displacement and rotation of the fragments and stress analysis on the scaphoid bone and screw were analyzed in the models using 3-D finite element analysis in three different wrist positions; total extension (TE), neutral (N) and total flexion (TF). RESULTS: Displacement of the fracture gap in volar fixation in all planes (x, y, z) was less than in dorsal fixation in the TF and N positions. Furthermore, rotational stability was stronger in volar fixation in all planes and wrist positions. von Mises stress values were concentrated on the proximal fragment in all wrist positions. CONCLUSIONS: Although both volar and dorsal fixation techniques can be preferred in Herbert type B2 fractures, results of this finite element analysis suggest that centrally placed volar compression screw fixation may be biomechanically advantageous over dorsal screw fixation. LEVEL OF EVIDENCE: I.
目的:舟状骨腰部骨折可通过掌侧或背侧螺钉固定。然而,对于应采用哪种手术固定方法尚无共识。本研究的目的是利用有限元分析比较在生理负荷条件下舟状骨腰部骨折的掌侧与背侧螺钉固定。 方法:采用掌侧或背侧入路,用无头空心加压螺钉固定横行舟状骨腰部骨折(Herbert B2型)模型。在三种不同的腕部位置(完全伸展(TE)、中立位(N)和完全屈曲(TF))使用三维有限元分析对模型中的骨折块位移和旋转以及舟状骨和螺钉的应力进行分析。 结果:在TF位和N位,掌侧固定时骨折间隙在所有平面(x、y、z)的位移均小于背侧固定。此外,在所有平面和腕部位置,掌侧固定的旋转稳定性更强。在所有腕部位置,von Mises应力值集中在近端骨折块上。 结论:虽然在Herbert B2型骨折中掌侧和背侧固定技术均可采用,但本有限元分析结果表明,中央放置的掌侧加压螺钉固定在生物力学上可能优于背侧螺钉固定。 证据水平:I级。
Orthop Traumatol Surg Res. 2018-11
Orthop Traumatol Surg Res. 2017-12-15
Acta Orthop Traumatol Turc. 2012
Bioengineering (Basel). 2025-7-22
Indian J Orthop. 2024-4-28
J Hand Surg Eur Vol. 2023-5