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Institute for Locomotion, Department of Orthopedic Surgery, Aix-Marseille University, Marseille, France Correspondence to: Jean-Noel A. Argenson. Institute for Locomotion, Hopital Sainte-Marguerite, Department of Orthopedic Surgery, 270 Boulevard Sainte-Marguerite, 13009 Marseille, France. Email: jean-noel.argenson@ap-hm.fr. Provenance: This is an invited article commissioned by the Academic Editor Dr. Ziming Chen (Centre for Orthopaedic Translational Research, Medical School, University of Western Australia, Nedlands, Australia). Comment on: Beard DJ, Davies LJ, Cook JA, et al. The clinical and cost-effectiveness of total versus partial knee replacement in patients with medial compartment osteoarthritis (TOPKAT): 5-year outcomes of a randomised controlled trial. Lancet 2019;394:746-56.

Medial femorotibial osteoarthritis of the knee: total or partial knee replacement?