Table 2.

Backside wear measurement results

Measured variable	Flat (posterior lipped insert)	Curved	p value
Backside median linear wear rate (mm/year)	0.0063 (range, 0–0.085)	0.05 (range, 0.00003–0.14)	< 0.001
Backside median volumetric rate (mm3/year)	14.2 (range, 0–282.8)	117 (range, 2.1–312)	< 0.001