Quadriceps-sparing versus traditional medial parapatellar approaches for total knee arthroplasty: a meta-analysis

Table 2 Quality assessment of included studies

Study/Year	Random Sequence Generation	Allocation Concealment	Blinding of Participants and Personnel	Blinding of Outcome Assessment	Incomplete Outcome Data	Selective Reporting	Other Bias
Lin 2013^*	Yes	Sealed envelope	Unclear	Yes	Yes	Unclear	Unclear
Xu 2013^*	Yes	Sealed envelope	Unclear	Unclear	Yes	Unclear	Unclear
Chiang 2012^*	Yes	Unclear	Yes	Yes	Yes	Yes	Unclear
Matsumoto 2011^*	Yes	Unclear	Yes	Unclear	Yes	Unclear	Unclear
Yang 2010^*	Yes	Unclear	Unclear	Yes	Yes	Yes	Unclear
Karpman 2009^*	Yes	Unclear	Yes	Yes	Yes	Unclear	Unclear
Kim 2007^*	Yes	Unclear	Unclear	Yes	Yes	Unclear	Unclear
Chin 2007^*	Yes	Sealed envelope	Yes	Yes	Yes	Yes	Unclear
		Selection	Comparability		Outcomes		Total score
Huang 2016^†		2	2		3		7
Qi 2016^†		3	2		2		7
Chotanaphuti 2008^†		3	2		3		8
Shen 2007^†		3	2		3		8
Huang 2007^†		2	2		3		7
King 2007^†		3	2		3		8
Chen 2006^†		3	2		2		7
Kim 2006^†		3	2		3		8

^*The risk of bias was assessed independently using the Cochrane Handbook for Systematic Reviews of Interventions; ^†Methodological quality of the included studies was assessed according to Newcastle-Ottawa Scale

ISSN: 1471-2474