Fig. 2From: Comparison of posterior cruciate retention and substitution in total knee arthroplasty during gait: a systematic review and meta-analysisa Risk-of-bias graph of the included studies. The risk-of-bias tool includes the selection bias, performance bias, detection bias, attrition bias, reporting bias, and other bias. + , low risk; −, high risk; ?, unclear risk. b Risk-of-bias summary. In the included studies, each bias project is presented as a percentage, and the proportion level of each bias project is pointed outBack to article page