Fig. 1.

Thirty-nine retrieved bearings were examined. Twenty-six bearings were direct compression molded (DCM) and 13 bearings were non-DCM. Of the DCM bearings, there were 19 retrieved from nonmodular (Non-Mod) cobalt-chromium baseplates. Seven DCM bearings were retrieved from modular titanium tibial baseplates (Modular). Of the Non-Mod DCM bearings, nine were from Vanguard (V) and were all cruciate retaining (CR). Ten Non-Mod DCM bearings were from Maxim articulations (M). Of these, two were CR and eight were posterior stabilized (PS). Of the modular baseplate DCM bearings, one was M-PS, one V posterior stabilized-constrained (PSC), and five M-PSC. All 13 non-DCM bearings were retrieved from modular baseplates. Of these, there were three M-CR, eight M-PS, and two M-PSC.