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

Posterior wall acetabular fracture fixation: A mechanical analysis of fixation methods. J Orthop Surg (Hong Kong). 2019 Sep-Dec;27(3):2309499019859838 Authors: Pease F, Ward AJ, Stevenson AJ, Cunningham JL, Sabri O, Acharya M, Chesser T Abstract 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...
Source: Journal of Orthopaedic Surgery - Category: Orthopaedics Authors: Tags: J Orthop Surg (Hong Kong) Source Type: research