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A 23-year-old professional rower presents with pain over the radial wrist when pronating and supinating his forearm. He denies any recent history of trauma and reports that the pain has been worsening over the past few months. On physical examination, there is crepitus over the distal forearm with wrist and thumb extension. Which of the following matches the correct extensor tendon compartment with the structures most likely affected in this pathology?
Compartment 2; Abductor pollicis longus (APL) and extensor pollicis brevis (EPB) muscle bellies
Compartment 2; Extensor carpi radialis brevis (ECRB) and extensor carpi radialis longus (ECRL) tendons
Compartment 2; APL and EPB tendons
Compartment 1; ECRB and ECRL muscle bellies
Compartment 1; Extensor pollicis longus (EPL) tendon
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A collegiate rower complains of dorsal wrist pain for 6 weeks refractory to NSAIDs and bracing. Maximal tenderness is palpated on the dorsoradial forearm approximately 5 cm proximal to the wrist. Pain is exacerbated with resisted wrist extension. Radiographs are unremarkable. A steroid injection should be directed into the compartment containing which of the following structures?
APL and EPB tendons
ECRL and ECRB tendons
APL and ECRB tendons