Divergent Dynamics: Unicompartmental Knee Arthroplasty Enables Greater Propulsive Joint Moments Compared To Total Knee Arthroplasty

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Key Points

This trial aims to assess the impact of unicompartmental and total knee arthroplasty on functional joint mechanics and patient outcomes.
Randomized controlled trial comparing UKA and TKA in 38 patients with data from 28 patients analyzed.
Instrumented gait analysis was performed pre-surgery and one year post-surgery.
Patients completed PROMs such as the Oxford Knee Score and WOMAC at multiple time points.
UKA patients had larger increases in sagittal hip (0.11 Nm/kgheight, P=0.003) and knee moments (0.05, P=0.010) compared to TKA patients.
UKA patients showed smaller changes in coronal knee moments (-0.12, P=0.001) than TKA patients.
Both UKA and TKA groups reported significant improvements in PROMs scores (P<0.001) across follow-up periods.

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Randomized trial shows UKA patients have better propulsive mechanics than TKA patients, indicating crucial implications for surgical choice.

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Kuntze et al. (2026) studied this question.

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