Table 3.

Details of 18 patients who required revision surgery.

Patient number	Side	Gender	Ossific nucleus	ON*	Followup (years)	Age at index surgery (months)	Failed abduction harness	Index procedure	Adductor release	Surgeon	Outcome after index procedure	Revision operation	Total number of revision operations
1	R	F	Present	0	10.68	5.00	Yes	OR	Yes	B	Subluxation	IO	1
2	R	F	Present	4	5.12	7.33	Yes	CR	Yes	A	Subluxation	OR, IO	1
3	L	F	Present	2	13.25	6.15	No	OR	Yes	C	Subluxation	OR	1
4	L	F	Absent	2	6.33	11.24	Yes	OR	Yes	B	Subluxation	OR, VDRO	2
5	L	F	Absent	0	5.52	6.90	Yes	CR	Yes	B	Subluxation	OR, VDRO	1
6	L	M	Absent	1	16.16	16.80	No	CR	Yes	A	Dislocation	CR	1
7	L	M	Absent	1	8.88	1.78	Yes	CR	No	A	Dislocation	OR	1
8	L	M	Absent	0	9.31	3.39	Yes	OR	Yes	A	Dislocation	OR, IO	1
9	R	M	Absent	0	17.65	3.29	Yes	CR	Yes	A	Dislocation	OR	1
9	L	M	Absent	2	17.65	3.29	Yes	CR	Yes	A	Dislocation	OR	1
10	R	F	Absent	3	14.47	17.85	No	OR	Yes	C	Dislocation	OR, VDRO	1
10	L	F	Absent	3	14.47	17.85	No	OR	Yes	C	Dislocation	OR, VDRO	1
11	L	F	Present	3	9.67	6.74	Yes	CR	Yes	B	Dislocation	OR, VDRO	3
12	L	F	Absent	4	3.59	12.72	No	CR	No	B	Dislocation	OR, VDRO	1
13	L	F	Absent	0	5.64	5.46	Yes	CR	Yes	B	Dislocation	CR	1
14	R	F	Absent	0	7.02	10.62	No	CR	Yes	B	Dislocation	OR	1
15	R	F	Present	1	5.47	5.62	Yes	CR	Yes	C	Dislocation	OR, IO	1
16	L	F	Absent	2	13.72	4.04	No	CR	Yes	C	Dislocation	OR, VDRO	1

ON = osteonecrosis; CR = closed reduction; OR = open reduction; IO = innominate osteotomy; VDRO = varus-derotation osteotomy;

* According to Bucholz and Odgen.