Table 5.

Followup and associated dislocation rates according to the couple of fraction and head size

Publication	Bearing couples	Size (mm)	Mean length of followup	Number of THAs	Percent dislocations (number of dislocations)
Berry et al. [2]	Metal-on-polyethylene	22	25 years	693	7 (49)
Berry et al. [3]	Metal-one-polyethylene	22	10 years	8691	3.8 (334)
		28		8797	4.3 (381)
		32		3559	2.7 (97)
Peters et al. [29]	Metal-on-polyethylene	28	52 months	160	2.5 (4)
		38	28 months	136	0
Cuckler et al. [10]	Metal-on-metal	28	5.3 years	78	2.6 (2)
		38	1.1 years	616	0
Peters et al. [29]	Metal-on-metal	38	36 months	370	0.3 (1)
		40–56		99	1.0 (1)
Amstutz et al. [1]	Metal-on-metal	36–54	3.5 years	400	0.8 (3)
Colwell et al. [8]	Ceramic-on-ceramic	28	35 months	158	1.9 (3)
		32		1154	1.3 (15)
		36		323	0
Current study	AL/PE	32	32 years	126	12.6 (15)
Current study	AL/AL	32	29 years	126	1.6 (2)

Number and percentage of dislocations are approximated from data in the articles; AL/PE = alumina-on-polyethylene; AL/AL = alumina-on-alumina.