Patient-specific unicompartmental knee resurfacing arthroplasty: use of a novel interference lock to reduce tibial insert micromotion and backside wear.

Micromotion has long been associated with wear of polyethylene tibial inserts, potentially causing failure of unicompartmental knee replacement systems. One cause of micromotion is the locking mechanism between the undersurface of the polyethylene and the tibial tray. The objective of this study was to investigate the use of new novel lock designs for reducing the micromotion associated with a patient specific tibial implant.