Table 1.

Number of patients per indication with demographic data and preoperative radiological measurements

Indication	Number of patients/hips	Average age	% female	Grade OA† (Tönnis) [22] (n hips)	Radiological measurements† [15, 17, 19] (Averages)	Dislocation† Crowe [5] (n hips)	Osteotomy (n hips)	Additional Corrections (n hips)
Idiopathic	44/48	56.7 (34–79)	50%	I 4	CE 37.9 (20–62)		26 valgus	14 extension
				II 22	Sharp 33.0 (30–46)		22 varus	13 IR*
				III 14				23 medial offset
Dysplasia	114/166	45.8 (16–75)	87%	0 18	CE 20.6 (0–46)	I 135	28 valgus	166 medial offset
				I 64	Sharp 42.9 (32–63)	II 15	138 varus	58 ER**
				II 54		III 1		20 IR
				III 20		IV 5		29 extension
Posttraumatic	22/23	37.0 (17–68)	42%	I 8			16 valgus	3 flexion
				II 10			5 varus	6 extension
				III 2			2 rotation	7 IR
SCFE	13/14	43.9 (25–55)	25%	I 2			11 valgus	2 flexion/IR
				II 6			3 varus	5 extension
				III 6				9 medial offset
LCPD	5/5	35.6 (18–62)	0%	I 3	Stullberg		5 valgus	1 flexion
				II 2	III 3			2 extension
					IV 2			1 medial offset
AVN	19/20	38.0 (16–60)	40%		Ficat and Arlet		13 valgus	2 extension
					III 8		6 varus	4 ER
					IV 12		1 rotation	10 medial offset

*IR=internal rotation

**ER=external rotation

†For some patients the preoperative radiological information could not be retrieved