A 26-year-old cellist presents with severe arm pain after robotic surgery to repair torn biceps tendon; the most likely diagnosis is?

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Complex regional pain syndrome arises after tissue injury such as surgery and presents with pain that is out of proportion to the exam, often accompanied by autonomic and trophic changes in the affected limb. In this scenario, a young patient develops severe arm pain after robotic repair of a torn biceps tendon, and the intensity and character of the pain, potentially with changes in skin color or temperature, swelling, and limited movement, fit CRPS much more than a purely structural issue. Tendinopathy would be more localized to the tendon itself and typically linked to overuse with less prominent autonomic signs. Brachial plexus injury would usually produce noticeable weakness or sensory loss in specific nerve distributions. Cervical radiculopathy would show neck pain with dermatomal radiating symptoms and sensory or motor findings corresponding to a nerve root. Thus, the presentation aligns best with complex regional pain syndrome.