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I-PACK Block. CPN: Common peroneal nerve; LA: Local anaesthetic; PA: Popliteal artery; PCK: Posterior capsule of the knee; TN: Tibial nerve. (Source: R. O'Donnell and J. Dolan* Anaesthesia and analgesia for knee joint arthroplasty. BJA Education, 18(1): 8e15, 2018)
