. 2012 Mar 17;36(8):1583–1588. doi: 10.1007/s00264-012-1525-6

Table 1.

Results

Stage	Mean Harris hip score		Radiographic progression	Stage of necrotic progression	Clinical failure	Conversion to THA
Stage	Pre-op	Post-op	Radiographic progression	Stage of necrotic progression	Clinical failure	Conversion to THA
I C (n = 3)	74	94*	–		–	–
II A (n = 7)	71	91*	1 (14.2 %) →	1 hip IIIA	–	–
II B (n = 11)	70	90*	2 (18.2 %) →	1hip IIIA	1 (9.0 %)	–
II B (n = 11)	70	90*	2 (18.2 %) →	1 hip IIIB	1 (9.0 %)	–
II C (n = 9)	67	89*	2 (22.2 %) →	1 hip IIIA	2 (22.2 %)	1 (11.1 %)
II C (n = 9)	67	89*	2 (22.2 %) →	1 hip IIIC	2 (22.2 %)	1 (11.1 %)
III A (n = 7)	62	79*	3 (42.8 %) →	1 hip IVA	2 (28.5 %)	2 (28.5 %)
III A (n = 7)	62	79*	3 (42.8 %) →	2 hips IVC	2 (28.5 %)	2 (28.5 %)
Total (n = 37)	68	86*	8 (21.6 %)		5 (13.5 %)	3 (8.1 %)

* p < 0.05