Table 4.

Acetabular linear osteolysis and maximum osteolysis width using radiographic analysis (frontal projections)

Variable	Charnley-DeLee Zone 1			Charnley-DeLee Zone 2			Charnley-DeLee Zone 3			Charnley-DeLee Zone 4			Charnley-DeLee Zone 5			Charnley-DeLee Zone 6
	PE	XLPE	p value	PE	XLPE	p value	PE	XLPE	p value	PE	XLPE	p value	PE	XLPE	p value	PE	XLPE	p value
Number of analyzable hips	27	25		27	25		27	25		19	18		16	17		20	18
Osteolysis (number of hips)			0.22†			0.02†			0.7†			0.3†			0.1†			0.3†
0%	4	10		20	13		6	3		8	13		13	17		7	5
0%–49%	8	4		1	9		12	10		4	3		1	0		5	8
50%–99%	9	6		2	1		4	6		3	1		0	0		3	4
100%	6	5		4	2		5	6		4	1		2	0		5	1
Maximum linear osteolysis width (mm)*	0.4 (0.3–0.5)	0.2 (0–0.5)	0.04‡	0 (0–0.3)	0 (0–0.3)	0.3‡	0.4 (0.3–0.9)	0.3 (0.2–0.8)	0.4‡	0.3 (0–1.0)	0 (0–0.2)	0.04‡	0 (0–0)	0 (0–0)	0.4‡	0.5 (0–1.1)	0.5 (0–0.7)	0.8‡

* Values are expressed as median, with 25 and 75 percentiles in parentheses; ^†exact test; ^‡Mann-Whitney U test; PE = polyethylene; XLPE = highly crosslinked polyethylene.