Adult patients undergoing carpal tunnel release with an ‘American Society of Anaesthesiologists’ (ASA) physical status of 1 to 3 were eligible. Exclusion criteria included an ASA status >3, <18 years old, bilateral surgery, a BMI ≥40, a local site infection, a history of neurological disorders, chronic pain symptoms, diabetes mellitus, allergy to local anaesthetic, a coagulopathy, prior ipsilateral arm surgery and the inability to understand and adhere to the study design. Written informed consent was obtained from all patients before inclusion in the study.
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