Polyethylene Subluxation: A Radiographic Sign of Locking Mechanism Failure After Modular Total Knee Arthroplasty

被引：7

作者：

Hepinstall, Matthew S. ^{[1
]}

Rodriguez, Jose A. ^{[1
]}

机构：

[1] Lenox Hill Hosp, Dept Orthoped Surg, New York, NY 10075 USA

来源：

JOURNAL OF ARTHROPLASTY | 2011年 / 26卷 / 01期

关键词：

total knee replacement; modularity; locking mechanism; backside wear; radiographic; evaluation; FOLLOW-UP; TIBIAL INSERTS; BACKSIDE WEAR; OSTEOLYSIS; DESIGN; COMPONENTS; REPLACEMENT; SYSTEM;

D O I：

10.1016/j.arth.2009.10.020

中图分类号：

R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学（修复外科学）];

学科分类号：

摘要：

Tibial insert locking mechanisms are intended to limit interface motion and "backside" wear in modular total knee arthroplasty (TKA). Nevertheless, anterior polyethylene subluxation is occasionally apparent on lateral radiographs after TKA, suggesting locking mechanism failure. We retrospectively identified 10 modular posterior-stabilized implants of a single design that were found to have failure of the locking mechanism at the time of revision surgery for osteolysis. Operative reports were reviewed for the presence of backside wear, and preoperative radiographs were inspected for polyethylene subluxation. All 10 implants demonstrated significant backside wear. Nine had anterior polyethylene subluxation evident on preoperative radiographs. Anterior polyethylene subluxation on the lateral radiograph is a subtle sign of failure of the locking mechanism in this modular posterior-stabilized TKA.

引用

页码：98 / 102

页数：5

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