Postoperative outcomes of total knee arthroplasty compared to unicompartmental knee arthroplasty: A matched comparison.

ABSTRACT

BACKGROUND: The purpose of this study was to evaluate early postoperative outcomes in patients following UKA (unicompartmental knee arthroplasty) compared to a matched cohort of TKA (total knee arthroplasty) patients. METHODS: Patients who met radiographic criteria for a medial UKA who underwent either a TKA or UKA at a single institution were matched based on age, gender, and BMI. RESULTS: One hundredy and fifty UKA in 138 patients and 150 TKA in 148 patients were included in this retrospective analysis. Mean age was 62.6 ±â€¯9 years and 65.2 ±â€¯9 years in the UKA and TKA groups respectively (p = .01). Patients who underwent UKA had significantly less pain at two and six weeks postoperatively compared to TKA patients with mean Numeric Pain Rating Scale (NPRS) scores of 3.7 ±â€¯1.1 vs. 7.8 ±â€¯1.2, p < .001 and 2.6 ±â€¯1.3 vs. 4.6 ±â€¯1.6, p < .001 respectively. Knee Society Scores (KSS) were higher in the UKA group at six weeks and two years postoperative (86.5 ±â€¯2.8 vs. 81.4 ±â€¯3.6, p < .001 and 89.5 ±â€¯2.4 vs. 84.5 ±â€¯3.3, p < .001 respectively). Return to work was faster in the UKA group (mean 20.6 ±â€¯7.89 vs. 38.6 ±â€¯6.23 days, p < .001). The UKA group also had higher mean Forgotten Joint Scores of 90.5 ±â€¯3.6 vs. 79.5 ±â€¯9.5 (p < .001). CONCLUSIONS: Patients with primarily medial compartment OA who underwent UKA had less postoperative pain, earlier return to work, and higher KSS compared to a matched group who underwent TKA.