Fig. 1A–J.

Shown are: (A) a retrieved AMK polished cobalt-chrome tibial baseplate with a tongue-in-groove locking mechanism design; (B) the backside of a retrieved AMK polyethylene insert with grooves noted for the locking mechanism; (C) a retrieved Sigma polished cobalt-chrome tibial baseplate with full peripheral-rim capture locking mechanism design; (D) the backside of a retrieved Sigma polyethylene insert with peripheral recess and anterior bumper for the locking mechanism; (E) a retrieved Scorpio nonpolished cobalt-chrome tibial baseplate with a full peripheral-rim capture; (F) the backside of a retrieved Scorpio polyethylene insert with peripheral recess and anterior wire for the locking mechanism; (G) a retrieved Triathlon nonpolished cobalt-chrome tibial baseplate with a peripheral-rim capture and central antirotational island locking mechanism; (H) the backside of a retrieved Triathlon polyethylene insert with recess for peripheral capture, anterior wire, and central cutout for antirotational island; (I) a retrieved Genesis II polished titanium tibial baseplate with partial peripheral-rim capture and anterior constraint; and (J) the backside of a retrieved Genesis II polyethylene insert with recesses for peripheral-rim and anterior captures.