Evans手术对跟骰关节压力影响的生物力学研究

Abstract

Abstract:

Objective To study the pressure change across the calcaneocuboid joint after lateral column lengthening (Evans) procedure and the best width of the lateral column distraction, for providing information and reference for Evans osteotomy. Methods Six fresh-frozen cadaveric specimens of foot were randomized into 7 experimental groups: intact, flatfoot deformity model, Evans osteotomy to extend the lateral columns of different widths (from 4mm to 12mm, in 2-mm increments). Vertical downward axial loads of 350N were applied to the specimens, the calcaneocuboid joint pressures were measured by the K-Scan joint analysis system and K-Scan6900# Sensor Model. Results Under loads of 350N, the calcaneocuboid joint peak pressure were: intact group: (9.21±1.60), flatfoot deformity model group: (24.90±2.45), LCL*4mm group: (21.68±2.21), LCL*6mm group: (15.95±2.59), LCL*8mm group: (11.04±1.15), LCL*10mm group: (15.20±2.35) and LCL*12mm group: (21.55±2.03) kg/cm2, respectively. The calcaneocuboid joint peak pressure was significantly higher in the flatfoot than intact group（P＜0.05); after the different Evans osteotomy, the pressure has been significantly reduced in LCL groups than the flatfoot (P <0.05)；there was no significant difference in the calcaneocuboid joint peak pressure between LCL*8mm group and intact group (P=0.143); the pressure in LCL*8mm group was relatively smaller than the other lateral column lengthening groups (P<0.05). Conclusions Lateral column lengthening by means of an Evans osteotomy within a certain extent will decreases the pressure across the calcaneocuboid joint on the flatfoot deformity. The pressure is minimal at the 8 mm width of the lateral column distraction, and we consider it near the normal state.

Key words: Evans osteotomy, Calcaneocuboid joint, Flatfoot, Biomechanics

CLC Number:

ZHANG Feng, JIA Jiang, SHU Guang-Rong, DIAO Hong-Mou, YANG Yun-Feng. Biomechanical effects on calcaneocuboid joint pressure after lateral column lengthening (Evans) procedure[J]. Chinese Journal Of Clinical Anatomy, 2012, 30(3): 337-341.

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Biomechanical effects on calcaneocuboid joint pressure after lateral column lengthening (Evans) procedure

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