Table 1.

Summary of included studies

Author, year	Patients/hips (n)	Age (mean)	M/F (n)	Body mass index (mean)	Follow-up (years)	Design	MINORS
Arabmotlag, 200352	15/15	48	7/8	–	2	CTX	17/22
Boller, 201950	39/39	51	13/26	28	2	Metha	12/16
	28/28	66	16/12	27	2	Metha
Brinkmann, 201541	24/24	59	12/12	27	1	Metha	16/22
	26/26	60	16/10	27		Nanos
Ercan, 201642	62/62	57	28/34	29	1	Minihip	10/16
Fokter, 201524	19/19	60	8/11	28	1	Unibionix	16/22
Freitag, 201633	57/57	57	36/21	30	1	Fitmore	19/22
Gasbarra, 201434	33/33	62	15/18	24	1	Fitmore	16/22
Hayashi, 201670	21/21	68	11/56	23	2	Trilock	12/16
Jahnke, 201443	40/40	55	20/20	27	1	Metha	13/16
Kim, 201125	50/60	54	22/28	26	3	Proxima	16/22
	50/60	52	24/26	25		Profile
Kim, 201626	201/221	53	118/83	30	10	Proxima	19/22
	400/530	53	264/136	29		IPS
Kim, 201636	200/200	53	138/62	30	12	Proxima	19/22
	200/200	53	138/62	30		Profile
Leali, 200427	10/10	65	4/6	–	3	Revelation	10/16
Lerch, 201244	25/25	59	16/9	25	2	Metha	13/16
Meyer, 201932*	54/54	–	–	–	5	Fitmore	–
Nysted, 201151	43/43	55	18/28	–	5	Unique	16/22
	35/35	53	13/28	–		ABG-I
Panisello, 200937	56/56	60	27/29	28	5	ABG-I	19/22
	54/54	59	26/28	27		ABG-II
Parchi, 201749	20/20	54	11/9	–	4	Metha	12/16
Rahmy, 200438	24/24	62	11/18	28	3	ABG-I	18/22
Salemyr, 201531	26/26	62	11/15	27	4	Proxima	21/22
Shafy, 201645	26/26	43	20/6	27	2	Minihip	12/16
Sluimer, 200628	40/40	53	15/25	–	2	Omnifit-HA 1090	18/22
Steens, 201546	20/20	49	12/8	26	5	ESKA cut 2000	14/16
Synder, 201547	36/36	50	18/18	–	1	Metha	12/16
Vd Wal, 200640	25/25	62	17/8	–	2	ABG-I	16/22
	26/26	60	12/14	–	2	ABG-II
Vd Wal, 200839	24/24	60	11/13	–	2	ABG-I	15/22
White, 200829	27/27	37	14/13	25	5	Epoch	9/16
Wixson, 199730	35/35	50	16/19	–	2	Custom made	9/16
Zeh, 201348	25/25	60	15/10	29	1	Nanos	11/16

Note. MINORS, Methodological Index for Non-Randomized Studies.

*Study between two age groups.

**follow-up of Freitag et al, 2016³³.