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Table 2 Quality assessment of included studies

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

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
  1. *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