UKA yielded lower joint awareness, decreased pain, improved function compared with TKA
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Results showed patients who underwent unicompartmental knee arthroplasty for medial compartment osteoarthritis had lower joint awareness, decreased pain, improved function and higher satisfaction compared with total knee arthroplasty.
Researchers analyzed two matched cohorts of patients with medial compartment OA who underwent either UKA or TKA between 2014 and 2015 at a single institution. The UKA cohort consisted of 127 UKAs in 120 patients (mean age of 69 years), while the TKA cohort consisted of 118 TKAs in 116 patients (mean age of 71 years). Outcomes were assessed at minimum 5-year follow-up and included Forgotten Joint Score, Knee Society Score (KSS), numeric pain rating scale (NPRS) score, survivorship free from all-cause revision and satisfaction.
Overall, the UKA cohort had a significantly higher mean Forgotten Joint score compared with in the TKA cohort (87 vs. 59).
“This is important because lower joint awareness generally leads to increased satisfaction and quality of life,” the researchers wrote in the study.
Mean KSS was higher in the UKA cohort compared with the TKA cohort (88 vs. 75) and mean NPRS score was lower in the UKA cohort compared with the TKA cohort (0.8 vs. 1.9). At 5 years, the UKA cohort had a survivorship of 99% and a satisfaction score of 37.2 (out of a possible maximum score of 40), while the TKA cohort had a survivorship of 96% and a satisfaction score of 32.5.
“UKA should be considered in patients who have isolated medial compartment OA and these results will help surgeons counsel their patients when deciding between these two options,” the researchers concluded.
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