Comparison of Clinical and Functional Outcomes in One vs Two Component Revision for Total Knee Arthroplasty.

PURPOSE Revisions of total knee arthroplasties (TKA) may require revision of one or both tibial and femoral components. Our purpose was to examine the clinical and functional outcomes in 1- vs 2-component TKA revisions. METHODS We identified 92 1-component ( tibial or femoral) revisions at a single center. Our inclusion criteria were isolated revision of the tibial or femoral components with minimum 2-year follow-up. The included cases were matched 1:2 with a control group of 2-component revisions (tibial and femoral) by age, body mass index (BMI), American Society of Anesthesiologists (ASA) score, and indication for revision. We collected demographics, complications, operative times, any subsequent re-revisions, and functional outcome scores. RESULTS The median follow-up time for the 1- and 2-component revision groups were 10 years (range, 3 to 17) and 8 years (range, 2 to 18), respectively. The most common complication after re-revision in both groups was stiffness at 9 of 92 (9.8%) and 9 of 170 (5.3%) in the 1- and 2-component groups, respectively (p=0.20). The overall complication prevalence in the 1- and 2- component revision groups was similar 20 of 92 (22%) and 35 of 170 (21%), respectively (p=0.87). Subsequent re-revisions for any indication were encountered in 12 of 92 (13.0%) of the 1-component and 18 of 170 (11%) in the 2-component groups (p=0.69). There was no statistical difference in survivorship or functional outcomes scores between the groups. CONCLUSIONS Our results sho wed that isolated revision of a single TKA component is an acceptable option, with comparable functional outcomes, complications, and survivorships when compared with both-component revision. As such, 1-component revision should be considered where appropriate.