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Catheter-based adductor canal blocks are an effective pain management strategy for total knee arthroplasty. Nevertheless, catheter-based techniques may fail if the tip migrates because of leg movement. This observational study used ultrasound to measure the distance from the skin to the adductor canal (SAC). We tested the hypothesis that leg movements mimicking those occurring during postoperative physiotherapy change the SAC distance.

Impact of leg movement on skin-adductor canal distance: a potential cause for catheter tip displacement?