Intersection Syndrome
An overuse inflammation where wrist extensor tendons cross on the back of the distal forearm.
Where it hurts
Pain and swelling are usually several centimetres above the wrist joint on the back/thumb side of the forearm, rather than directly over the radial styloid.
Why it happens
Tendon compartments cross in this area. Repetitive wrist extension, rowing, skiing, weight training and other high-load activity can increase friction and inflammation.
Diagnosis
The location of tenderness and activity pattern are often characteristic. Crepitus may be felt with wrist movement. Ultrasound can support the diagnosis when needed.
Treatment
Activity modification, ice, short-term splinting, anti-inflammatory treatment when appropriate and gradual rehabilitation are commonly used.
Injection
Corticosteroid injection may be considered when symptoms persist despite appropriate conservative care.
Surgery
Operative decompression is uncommon and reserved for persistent cases that do not respond to non-operative treatment.