Table 2.

Breakdown of the bearing combinations in the National Joint Registry (NJR) from 2003–2013

		Matched	Mix & match
Hard-on-soft	Monobloc or modular stem metal head on monobloc poly cup modular cup with poly liner	519,993	79,672 approx. (13.3%)
	Ceramic head on poly cup	27,909	7,894 approx. (22.0%)
Hard-on-hard	Ceramic-on-ceramic	83,295	3,861 approx. (4.4%)
	Metal-on-metal (include. standard head size & resurfacing)	29,206	4,138 approx. (12.4%)
Approximate totals (some data were not ‘clean’ enough to use)		660,403 87.4%	95,565 (12.6 %)

Source: Courtesy of Keith Tucker.