Bone and Joint Institute

Title

The Effect of Subluxation of Articulating Antibiotic Spacers on Bone Defects and Degree of Constraint in Revision Knee Arthroplasty

Document Type

Article

Publication Date

1-1-2016

Journal

Journal of Arthroplasty

Volume

31

Issue

1

First Page

199

Last Page

203

URL with Digital Object Identifier

10.1016/j.arth.2015.07.009

Abstract

© 2016 Elsevier Inc. This study investigated whether subluxation of articulating antibiotic spacers is associated with the bone defects found and constraint required when re-implanting the knee arthroplasty components. Staged revisions for infections of primary total knee arthroplasties between 2004 and 2012 were examined. Radiographic sagittal and coronal subluxations of 72 knees were measured prior to second stage revision. Coronal subluxation was found to be associated with increased requirement for constrained knee systems (P<. 0.035). Sagittal subluxation was associated with greater tibia bone defects (P<. 0.037). Careful surgical technique and monitoring of articulating spacers should be done to avoid subluxation after stage 1 revision. If subluxation of the articulating spacer is present, constrained revision knee systems as well as augments should be available at time of re-implantation.

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