Table 3.

Outcome in patients undergoing drilling

Patient	Affected bone	ARCO stage at drilling	Time from diagnosis and drilling	Years to ARCO stage 4
1	Femoral head	1	1 week	1.5
2	Femoral head	2	10 months	2
3	Proximal tibia	2	4 months	2
4	Femoral head	2	3 months	2
5	Humeral head	1	14 months	No progression
6	Humeral heads	2, 2	8 months	4, 4
7	Femoral head	2	1 month	1
8	Femoral head	1	11 months	1
9	Femoral head	1	18 months	3
10	Femoral head	1	2 months	No progression
11	Femoral head	1	2 weeks	0.5