Fig. 5From: Efficacy and safety of continuous passive motion and physical therapy in recovery from knee arthroplasty: a systematic review and meta-analysisA Assessment of the risk of bias. The traffic lights with “x,” “+,” and “−” represent that the corresponding domains are of high, low, and unclear risk of biases, respectively; B risk of bias summary. The plus sign means low risk, the question mark means unclear risk, and the minus sign means high risk.Back to article page