Abstract

Stenosing tenosynovitis occurs due to a constrictive effect on a tendon. Causes include anatomical, mechanical, and hormonal. In the ankle, the most commonly affected tendon is the flexor hallucis longus as it travels from the deep posterior compartment of the leg to the hallux. Diagnostic ultrasound allows for direct visualization of the site of constriction and localized treatment using ultrasound guidance. We report a case of stenosing tenosynovitis of the flexor hallucis longus tendon diagnosed with dynamic ultrasound evaluation. Ultrasound guidance was later used to inject the area of constriction with a corticosteroid which resolved the patient’s pain and triggering.

Keywords: Stenosing tenosynovitis; Flexor hallucis longus; Diagnostic ultrasound; Ultrasound-guided injection; Hallux saltans