Table 3.

Risk of Bias assessment using the MINORS criteria for each study

Study	Clearly stated aim	Inclusion of consecutive patients	Prospective collection of data	Endpoint appropriate to the aim of the study	Unbiased assessment of the study endpoint	Follow up period appropriate to the aim of the study	Loss of follow up less than 5%	Prospective calculation of the study size	An adequate control group	Contemporary group	Baseline equivalence of groups	Adequate statistical analysis	Total
Seyler [36]	2	1	2	2	0	2	0	0	2	1	0	2	14
Bonutti [8]	2	0	0	2	0	2	0	2	2	1	0	2	13
Plate [33]	2	1	0	2	0	2	2	0	2	1	0	2	12
Zengerink [45]	2	0	0	2	0	2	2	0	2	1	0	2	13
Venkatesh [40]	2	0	0	2	0	2	1	0	2	1	0	2	12
Woo [42]	2	0	0	2	0	0	0	0	2	1	0	2	11
Murray [30]	2	2	2	2	0	2	2	2	2	2	0	2	20
Xu [44]	2	0	0	2	0	2	0	0	2	1	0	2	11
Polat [34]	2	1	0	2	0	2	0	0	2	1	0	2	12