Updated in 3/2/2011 11:26:14 AM      Viewed: 748 times      (Journal Article)
The Journal of bone and joint surgeryAmerican volume.: 1031-7 (2004)

Backside wear of modular ultra-high molecular weight polyethylene tibial inserts

MA Conditt , SK Ismaily , JW Alexander , PC Noble
BACKGROUND: The capture mechanisms of modular tibial total knee components may allow relative micromotion between the insert and the base-plate, leading to wear at the nonarticulating (backside) surface. Although retrieved components often display laxity in the capture mechanism in the unloaded condition, the magnitude of the relative motion that actually occurs under physiologic conditions has not been determined. This study was performed to assess the impact of different modes of knee-loading on the relative micromotion between the insert and the base-plate and the relationship between the duration that the implant had been in situ and the severity of backside wear.