Proximal intersection syndrome
Electrician with forearm pain and swelling.
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Skin marker placed over the site of pain and swelling. Soft tissue swelling and edema with fluid in the tendon sheath at the point of APL and EPB crossing or intersecting with the ECRL and ECRB tendons.
Proximal intersection syndrome is a painful "friction" condition that affects the thumb side of the forearm when inflammation occurs at the intersection of the musculotendinous junctions of the abductor pollicis longus and extensor pollicis brevis as they cross over the extensor carpi radialis longus and the extensor carpi radialis brevis tendons. The mechanism of injury is usually repetitive resisted extension, as with rowing, weight lifting, or pulling. Proximal intersection syndrome is often confused with De Quervain's tenosynovitis that occurs more distally at the wrist rather than the forearm.