The Intersection Syndrome affects the wrist in wide range of activities.
Anatomic site affected: crossing point between the first and second dorsal compartments in the wrist
First compartment tendons: abductor pollicis longus, extensor pollicis brevis
Second compartment tendons: extensor carpi radialis brevis, extensor carpi radialis longus
Mechanism: tenosynovitis caused by repetitive friction at the junction in which tendons of the first dorsal compartment cross over the second dorsal compartment
Triggering activities: repetitive extension and flexion of the wrist
It may affect participants in:
(1) ice cliff or mountain climbing
(2) rowing
(3) racquet sports
(4) baseball
(5) hockey
(6) golf.
(7) skiing
(8) canoeing
(9) horseback riding
Clinical features:
(1) wrist pain just proximal and dorsal to the radial styloid, which is worse on pronation
(2) variable forearm pain
(3) swelling
(4) crepitus over the dorsum of the wrist
Ultrasound supports the diagnosis.
