Fig. 2From: iPACK block (local anesthetic infiltration of the interspace between the popliteal artery and the posterior knee capsule) added to the adductor canal blocks versus the adductor canal blocks in the pain management after total knee arthroplasty: a systematic review and meta-analysisRisk of bias table: “ + ”: low risk of bias; “?”: unclear risk of bias; and “ − ”: high risk of biasBack to article page