OBJECTIVE: To compare the strength of locking vs. non-locking plate fixation in comminuted talar neck fractures.
METHODS: Seven pairs of cadaveric tali were randomised to locking or non-locking plate fixation. A standardised model of talar neck fracture with medial comminution was created, and fixation performed. The fixed specimens were mounted onto a motorised testing device, and an axial load applied.
RESULTS: Peak load to failure, deformation at failure, work done to achieve failure, and stiffness of the constructs were measured. No statistically significant difference was found between locking and non-locking constructs for all parameters.
CONCLUSIONS: Both constructs provide similar strength to failure in talar neck fracture fixations. Mean peak load to failure did not exceed the theoretical maximum forces generated of 1.1 kN when weight-bearing. We would advocate caution with early mobilisation in both fixations.
目的:比较锁定与锁定的强度非锁定钢板内固定治疗距骨颈粉碎性骨折.
方法:将7对尸体距骨随机分为锁定或非锁定钢板固定。建立了内侧粉碎距骨颈骨折的标准化模型,并进行了固定。将固定的样品安装到电动测试装置上,和施加的轴向载荷。
结果:故障峰值负荷,破坏时的变形,为失败而做的工作,并测量结构的刚度。对于所有参数,在锁定和非锁定构建体之间没有发现统计学上的显著差异。
结论:两种结构对距骨颈骨折固定失败提供了相似的强度。平均破坏峰值载荷不超过负重时产生的理论最大力1.1kN。我们主张谨慎行事,尽早动员这两种关注。