In vivo wear performance of highly cross-linked polyethylene vs. yttria stabilized zirconia and alumina stabilized zirconia at a mean seven-year follow-up

Table 3 Summary of maximum transformation rate and surface roughness of retrieved yttria stabilized zirconia heads

	N	Duration	Transformation rate	Surface roughness
		(years)	(%)	Ra (μm)
Hayaishi et al. [24]	1	1	13	0.01
Hernigou et al. [26]	3	8-11	30	0.05
Haraguchi et al. [27]	2	3, 6	37	0.12
Roy et al. [23]	7	0.04-11	49	0.03
Fernandez-Fairen et al. [8]	47	2-10	65	0.30
Santos et al. [28]	18	0.2-10	70	0.04
Present study	3	1.5-3	51	0.06