Table IV.

Survivorship of the hip after Spherical periacetabular osteotomies

Authors	Year	Technique	No. of hips	Mean age (year)	Duration of follow-up (year)	Survival rate (%) (THA as endpoint)	Survival rate (%) (poor results as an endpoint)	Follow-up rate (%)
Schramm et al. [33]	2003	Spherical, Wagner	22	24.4	23.9 (22–29.3)	76	86 at 20 years, 76 at 24, 65 at 25 years	88
Miller et al. [34]	2005	Dial	44	18.9 (8–31)	12.6 (5.6–20.2)	87	73	N/A
Nakamura et al. [36]	1998	RAO	145	28 (11–52)	13 (10–23)	95	68	63
Nozawa et al. [46]	2002	RAO	50	31.8 (13–53)	11.4 (10–14.5)	98	80	90
Yasunaga et al. [40]	2004	RAO	61	35 (13–58)	10.5 (8–14.5)	100	90	95
Okano et al. [43]	2008	RAO	49	33 (13–54)	13 (10–17)	100	81	82
Hasegawa et al. [38]	2014	ERAO	130	27 (15–59)	19.7(15-23)	87	78	98
Ito et al. [44]	2011	RAO	117	Young 27 (12–39)	11 (5–20)	97	87	95
			41	Old 47 (40–56)	11 (5–19)	93	73	95