Table 1: Studies of Wear Rates of Alumina-on-Polyethylene Bearing Total Hip Arthroplasty

Study	No. of Hips	Follow-Up Duration (Year)	Acetabular Bearing	Diameter (mm)	Linear Wear Rates (mm/Year)	Range Linear WearRates	Wear Measurement
Zichner et al. [16]		5	UHMWPE			0.1-0.2	Buchhorn
Sugano et al. [29]	57	11.1	UHMWPE	28	0.10	0-0.31	Computerized
Wroblewski et al. [21]	19	6.4	XLP	22.225	0.06	0.024-0.32	Collins
Livingston et al. [22]	7	14-16	Hylamer	28	0.33		Livermoore
Sychterz et al. [23]	9	10-19	UHMWPE	32	0.16		Computerized
Sychterz et al. [18]	81	7	UHMWPE	32	0.09		Computerized
Oonish et al. [5]	12		100Mrad PE	28	0.05	SD 0.03	Livermoore
	111		UHMWPE	28	0.1	SD 0.007	Livermoore
Hasegawa et al. [24]	44	13	UHMWPE	28	0.1		Livermoore
Haraguchi et al. [20]	101	14	UHMWPE	28	0.15	0.04-.034	Computerized (Sugano)
Urban et al. [12]	18	18.2	UHMWPE	32	0.034	0.00016-0.077	Livermoore
Tanaka et al. [30]	67	13.6	UHMWPE	28		0.036-0.365	Computerized
	41	10.8	UHMWPE	26		0.005-0.199	(Sychterz)
	48	9.2	UHMWPE	22		0.007-0.342
Hernigou and Bahrami [13]	56	10.8	UHMWPE	32	0.071	0.041-0.101	Magnifier (Devane)
Kim et al. [15]	101	9.2	UHMWPE	28	0.07	0.01-0.27	Livermoore
Kim et al. [14]	67	7	UHMWPE	28	0.07	0.01-0.23	Dorr and Wan
Wroblewski et al. [25]	11	17	XLP	22.225	0.019	0-0.026	Collins
Liang et al. [26]	46	6.7	UHMWPE	22	0.078	0.02-0.27	Computerized (Sychterz)
Kim et al. [27]	30	11.3	UHMWPE	28	0.1	0.09-0.12	Computerized
Lewis et al. [28]	26	8.1	UHMWPE	28	0.11		Dorr and Wan
Kim et al. [44]	100	5.6	HXLPE	28	0.06	0-0.08	Computerized