Greater knee flexion and patient-reported function after unicompartmental knee arthroplasty than after total knee arthroplasty: a propensity score-matched study.

Kohei Nishitani, Shinichi Kuriyama, Yugo Morita, Sayako Sakai, Shinichiro Nakamura, Shuichi Matsuda

Abstract readComparative Study

In one paragraph

Article in International orthopaedics, 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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6 authors.

Kohei NishitaniDepartment of Orthopaedic Surgery, Kyoto University, Kyoto, Japan. nkohei@kuhp.kyoto-u.ac.jp.

Shinichi KuriyamaDepartment of Orthopaedic Surgery, Kyoto University, Kyoto, Japan.

Yugo MoritaDepartment of Orthopaedic Surgery, Kyoto University, Kyoto, Japan.

Sayako SakaiDepartment of Orthopaedic Surgery, Kyoto University, Kyoto, Japan.

Shinichiro NakamuraDepartment of Orthopaedic Surgery, Kyoto University, Kyoto, Japan.

Shuichi MatsudaDepartment of Orthopaedic Surgery, Kyoto University, Kyoto, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe purpose of this study was to compare knee range of motion and 2011 Knee Society Score (2011KSS) after unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA) in background-matched cohort.

methodsUKA and TKA for medial knee osteoarthritis were included, and preoperative patient backgrounds, knee alignment, osteoarthritis severity, knee range of motion, 2011KSS symptoms, satisfaction and functional activities were matched using a propensity score. Knee range of motion and 2011KSS were evaluated two year postoperatively.

resultsAmong 116 UKAs and 656 TKAs, 98 each arthroplasty were matched (mean 75 years). UKA showed greater knee flexion (mean: 136.6° vs 122.4°, p < 0.001) and 2011KSS functional activities (median: 78 vs 68, p = 0.04) at 2-year. There were no differences in knee extension or other 2011KSS domains.

conclusionUKA showed greater knee flexion and subjective functional score than TKA. UKA may be beneficial for populations with high flexion demands.

Indexed as

Arthroplasty, Replacement, KneeKnee JointOsteoarthritis, KneeRange of Motion, ArticularAgedAged, 80 and overFemaleHumansMaleMiddle AgedPatient Reported Outcome MeasuresPatient SatisfactionPropensity ScoreRecovery of FunctionTreatment OutcomeMuscle strengthOsteoarthritisPatient reported outcome measuresRange of motionTotal knee arthroplastyUnicompartmental knee arthroplasty

Identifiers

PMID42162414

DOI10.1007/s00264-026-06861-9

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.