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Transducer placement and ultrasound images with radiofrequency cannula for IPBSN (A, B) and RFN (C, D). White dashed arrows indicate the needle trajectory. Yellow stars indicate the patella apex and tibial tuberosity. IPBSN: infrapatellar branch of the saphenous nerve, RFN: recurrent fibular nerve, MTC: medial tibial condyle, P: patella.
