Conversion of a Surgically Arthrodesed Knee to a Total Knee Arthroplasty-Is it Worth it? A Meta-Analysis

Abstract

Background: Conversion of a surgically arthrodesed knee to total knee arthroplasty (TKA) is an option for a select group of patients who are not satisfied with their results. However, there is a paucity of literature on this topic. A systematic review of literature was performed to (1) describe the overall demographic characteristics; (2) evaluate the clinical outcomes; (3) determine the overall rate of complications; and (4) evaluate the overall satisfaction of patients who underwent conversion of an arthrodesed knee to TKA.

Methods: A comprehensive literature search was systematically performed to evaluate all studies included in the literature until July 2015. The specific search terms used were "fusion knee" and "arthrodesis knee," which revealed a total of 2206 studies. A review and selection of these abstracts were then performed based on inclusion and/or exclusion criteria; a total of 10 articles were used for final review.

Results: There were a total of 98 surgically arthrodesed knees that subsequently underwent TKA. Patients had a mean age of 55 years and were followed up for a mean of 5 years. Using a random effects model, there was an overall complication rate of 47%, an overall revision rate of 25%, and an overall failure rate of 11%. However, most patients were overall satisfied with the procedure.

Conclusion: Fusion takedown is a challenging procedure that should only be performed by experienced surgeons after extensive discussion with the patients. The clinical outcomes are good with overall patient satisfaction, but complication rates are high including risk of repeat fusion or amputation.

Keywords: arthroplasty; knee arthrodesis; knee fusion; revision knee arthroplasty; takedown.