Fig. 1

Elimination of medial abrasion phenomenon. a Before wound closure, the medial plica (*) was identified in the medial gutter. b The synovial fold of the distal part of the medial plica (*) was found to have originated from the tendon sheath of the pes anserinus (P). c After the medial plica was completely removed, the prosthesis was clearly visible. d Various degrees of wear and fibrillation could be found along the margin of the medial plica, which was always hypertrophied and sometimes became cord-like (*); a small branch of the skeletal muscle originating from the genu articularis (G) was found in all knees