Impact of severe varus deformity on the outcome of mobile-bearing unicompartmental knee arthroplasty: a comparison of patients with varus deformity of less than and more than 15 degrees using matched-pair analysis - Summary - MDSpire
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Impact of severe varus deformity on the outcome of mobile-bearing unicompartmental knee arthroplasty: a comparison of patients with varus deformity of less than and more than 15 degrees using matched-pair analysis
To compare the outcomes of unicompartmental knee arthroplasty (UKA) in patients with large preoperative varus deformities (> 15 degrees) to those with lesser deformities (< 15 degrees).
Approach:
Study Design: Retrospective matched-pair analysis of patients who underwent UKA from January 2016 to December 2020.
Patient Selection: Patients with preoperative varus Hip knee ankle angle (HKA) > 15º were matched for age and gender with those having HKA < 15º.
Surgical Technique: Oxford phase 3 UKA implants were used, following a quadriceps-sparing approach without soft tissue releases.
Outcome Measures: Preoperative and postoperative functional scores (OKS, VAS, WOMAC, FJS) and radiographic evaluations were conducted.
Key Findings:
Patients with HKA > 15° had poorer functional outcomes compared to those with HKA < 15°.
Postoperative residual varus was associated with poorer functional outcomes.
No revisions or reoperations were noted at the last follow-up.
Interpretation:
Limitations:
Retrospective design may introduce selection bias.
Small sample size may limit generalizability of findings.
No soft tissue releases were performed, which may affect outcomes.
Conclusion:
UKA for severe varus deformities (> 15°) results in poorer functional outcomes compared to lesser deformities.
