ArticleArchives of orthopaedic and trauma surgery2026
Lateral unicompartmental knee arthroplasty through a medial parapatellar approach: surgical technique and mid-term results in 108 patients.
Article in Archives of orthopaedic and trauma surgery, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionLateral unicompartmental knee arthroplasty (L-UKA) is typically performed through a lateral parapatellar approach. Few studies of L-UKA performed through a medial approach are published. We aimed to present surgical tips, and mid-term clinical results and survivorships of L-UKA performed through a medial approach.
methodsWe retrospectively reviewed single-centre single-surgeon data from L-UKA using medial parapatellar approach between 2016 and 2023. Patients with follow-up < 12 months were excluded. Primary endpoint was implant survivorship (time from index surgery to revision or last follow-up). Secondary endpoints included the rates of patients achieving Patient Acceptable Symptom State (PASS) thresholds: ≥ 67.5 for Knee Society Score-Knee (KSS-K) and ≥ 70.5 for Knee Society Score-Function (KSS-F). Survival analysis was used for implant survivorship. Logistic regression was performed for factors potentially associated with failure to achieve the PASS thresholds. Significance was set at P < 0.05.
resultsAmong 110 patients initially identified, two died before 12-month follow-up and were excluded from clinical outcome analysis, leaving 108 patients for functional assessment at a mean 47.6 months ± 24.5 of follow-up (range 12–96.7 months). No complications were reported during hospitalization. There were four failures (3.7%) overall: two cases (1.8%) of OA progression, one (0.9%) of aseptic loosening, and one case (0.9%) of periprosthetic fracture of the medial condyle requiring revision surgery. All 110 patients were included in survival analysis, with the 2 patients who died before 12 months included as censored data at time of death. The overall 7-year survivorship was 97.2% (95% CI 94.2–100%), declining to 92.1% at 84 months when the last revision occurred. PASS thresholds were achieved by 99.0% patients for KSS-Knee and by 86.1% for the KSS-F. Patient age was a significant predictor of failure to achieve functional PASS thresholds (OR = 1.3 per year, 95% CI 1.0–1.6, p = 0.036).
conclusionsL-UKA performed through a medial parapatellar approach yielded excellent clinical outcomes and survivorship at mid-term follow-up. LEVEL OF EVIDENCE: IV (retrospective case series).
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