Table 2.

Functional and clinical outcomes

Study	Functional assessment	Outcome	Follow-up time (months)	Radiologic assessment	Outcome	Mean follow-up time (months)
Gangji, 2011 [11]	VAS	+	24	MRI	Delay to collapse: +	NA
	Lesquene	+			Delay to THR: ND
	WOMAC	+
Zhao, 2012 [54]	HHS	+	24	MRI	Delay to collapse: +	NA
					Delay to THR: ND
Sen, 2012 [45]	HHS	−	24	MRI, X-rays	Delay to THR: −
Koo, 1995 [24]	MAP	+	13	MRI, X-rays	Delay to collapse: ND	24
					Delay to THR: ND
Neumayr, 2006 [38]	CHOHES	I	27	MRI, X-rays	Delay to THR: ND	CD group: 37.2
						Control group: 36
					Delay to collapse: ND
Stulberg, 1991 [49]	HHS	+	13	MRI, X-rays	Delay to THR: +	26.8
Chen , 2012 [9]	HHS	ND	24	MRI, X-rays	Delay to collapse: ND	NA
	SF-36	ND			Delay to THR: ND
Lai, 2005 [26]	HHS	I	24	MRI, X-rays	Delay to collapse: +	8
					Delay to THR: +
Lee, 2015 [27]	HHS	−	24	MRI, X-rays	Delay to collapse: ND	24
	WOMAC	−	24		Delay to THR: ND
Hsu, 2010 [18]	HHS	−	26	MRI, X-rays	Progression: ND	NA
	MAP	–			Delay to THR: ND
	WOMAC	–
	SF-12	–
Wang, 2008 [51]	HHS	−	6.5	MRI, X-rays	Progression: ND	24.87–26.14
Kang, 2012 [23]	HHS	−	15.75	MRI, X-rays	Delay to collapse (+)	62.5

Outcomes: (+) significant improvement, (−) no significant improvement; (ND) no difference, and (I) statistics not reported

MAP Multidimensional Assessment Pain Scale, WOMAC Western Ontario and McMaster Universities Arthritis, CHOHES Children’s Hospital Oakland Hip Evaluation Scale, HHS Harris Hip Scores, VAS visual analogue score, SF-36 Short-Form 36 Health Survey, SF-12 Short-Form 12 Health Survey