In this radiology lecture, we review the ultrasound appearance of intersection syndrome, a friction tenosynovitis at the forearm and wrist!

Key teaching points include:

Intersection syndrome is an overuse tenosynovitis (inflammation of tendon and tendon sheath) secondary to repetitive friction at site of intersection
Proximal intersection syndrome: Occurs at musculotendinous junctions of first extensor wrist compartment (extensor pollicis brevis, abductor pollicis longus) crossing tendons of second compartment (extensor carpi radialis brevis, extensor carpi radialis longus). Intersection occurs 4-8 cm proximal to Lister’s tubercle
Results from repetitive extension/flexion activities: Rowing, skiing, racket sports, horseback riding, weight-lifting
Clinical presentation: Radial forearm or wrist pain, worsens with extension/flexion
Ultrasound findings: Pain with transducer pressure at intersection site, peritendinous edema and fluid
Distal intersection syndrome: Less common, occurs at third compartment tendon (extensor pollicis longus) crossing second compartment tendons distal to Lister’s tubercle
Tx: Rest, activity modification, splinting, anti-inflammatory medications. Corticosteroid injection or surgical release may be required if refractory

To learn more about the Samsung RS85 Prestige ultrasound system, please visit: https://www.bostonimaging.com/rs85-prestige-ultrasound-system-4

Click the YouTube posts tab or follow on social media for bonus teaching material posted throughout the week!

This video is for informational purposes only. It does not replace the advice or counsel of a doctor or health care professional.

Ultrasound of Intersection Syndrome