Table 1.

TKA implant models

TKA model	Tibial baseplate design	Tibial baseplate composition	Tibial baseplate roughness (Ra)	Locking mechanism design
AMK® (DePuy, Warsaw, IN, USA)	Polished	Cobalt-chrome	< 0.10 µm	Anterior tongue-in-groove with central locking pin
Sigma® (DePuy, Warsaw, IN, USA)	Polished	Cobalt-chrome	< 0.35 µm	Full peripheral capture
Scorpio® (Stryker, Mahwah, NJ, USA)	Nonpolished	Cobalt-chrome	< 2 µm	Complete peripheral rim capture with three anterior barbs for insert wire
Triathlon® (Stryker, Mahwah, NJ, USA)	Nonpolished	Cobalt-chrome	< 4 µm	Complete peripheral rim capture with central antirotational island and three anterior barbs for insert wire
Genesis® II (Smith & Nephew, Memphis, TN, USA)	Polished	Titanium	< 0.08 µm	Partial peripheral capture with posterior lipped edge and anterior constraint