Table 2.

Surgical procedures and specifics at the index operation

		Matched a
	Control		Group 1		Group 2
Total hip arthroplasties (patients)	22 (22)	p-value	22 (21)	p-value	50 (48)
No osteotomy	14	0.5 b	15	0.2 b	22
Transfemoral osteotomy	7	0.5	5	0.1	22
Greater trochanter osteotomy	1	1	1	0.5	1
Approach via nonunion in greater trochanter	0	0.9	1	0.2	5
Spacer	–	–	–	–	29
Acetabular component					c
SL uncemented cup	2	1 b	2	0.6 b	2
Müller reinforcement ring	16	1	16	0.08	24
Burch-Schneider reinforcement ring	4	1	4	0.03	23
Femoral component		1 b		0.8 b	c
uncemented	11		11		26
cemented	11		11		23
Acetabular graft		0.2 d		0.9 d	c
no graft	5		9		27
autograft, morselized	4		10		9
allograft, blocks > 2 cm or slices	2		3		10
auto- and allograft	1		0		3

^a Control and group 1 were matched for all the variables listed.

^b Chi-square test.

^c In group 2, one patient died prior to reimplantation (see also complications, Table 4).

^d Mann-Whitney U-test.