Posterior wall acetabular fracture fixation: A mechanical analysis of fixation methods

固定(群体遗传学) 刚度 医学 口腔正畸科 内固定 后柱 扶壁 生物力学 流离失所(心理学) 横截面 髋臼 结构工程 解剖 材料科学 复合材料 工程类 心理学 人口 环境卫生 心理治疗师
作者
Felicity Pease,AJ Ward,AJ Stevenson,J L Cunningham,O Sabri,M Acharya,T.J.S. Chesser
出处
期刊:Journal of orthopaedic surgery [SAGE Publishing]
卷期号:27 (3) 被引量:18
标识
DOI:10.1177/2309499019859838
摘要

Stable, anatomical fixation of acetabular fractures gives the best chance of successful outcome, while penetration of the acetabular articular surface with screws is associated with poor outcomes. Spring plates are an alternative to interfragmentary lag screws when penetration is a concern. A mechanical study comparing fracture stability and construct stiffness of three fixation methods for posterior wall acetabular fractures with transverse comminutions was performed. The three fixation methods tested were a posterior wall rim plate, a posterior wall buttress plate with separate lag screws and a posterior wall plate with two spring plates. Nine samples were tested, three for each fixation method. Two-dimensional motion analysis was used to measure fracture fragment displacement and construct stiffness. After two 6000 cycle-loading protocols, to a maximum 1.5 kN, the mean fracture displacement was 0.154 mm for the rim plate model, 0.326 mm for the buttress plate and 0.254 mm for the spring plate model. Mean maximum displacement was significantly less for the rim plate fixation than the buttress plate (p = 0.015) and spring plate fixation (p = 0.02). The rim plate was the stiffest construct 10,962 N/mm, followed by the spring plate model 5637 N/mm and the buttress plate model 4882 N/mm. Based on data obtained in this study, where possible a rim plate with interfragmentary lag screws should be used for isolated posterior wall fractures as this is the stiffest and most stable construct. When this method is not possible, spring plate fixation is a safe and a superior alternative to a posterior buttress plate method.
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