CME OnDemand: 2022 AOFAS Annual Meeting-Ultrasound Imaging and Prevalence of Intrasheath Peroneal Tendon Subluxation in Asymptomatic Volunteers

Ultrasound Imaging and Prevalence of Intrasheath Peroneal Tendon Subluxation in Asymptomatic Volunteers

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The study aimed to determine the normal variation in motion of the peroneal tendons and the prevalence of intrasheath peroneal tendon subluxation in asymptomatic volunteers. The researchers collected static sonographic images of the peroneal tendons in multiple ankle positions and during dynamic ankle circumduction. The results showed that intrasheath subluxation was not visualized in any static position but was visualized in 33% of patients during active ankle circumduction. The greatest percent displacement was observed in active ankle plantarflexion for the peroneus brevis tendon and in active pronation for the peroneus longus tendon. There were no differences between active and passive motions or with ankle positioning. A non-painful ankle "snap" was felt in all cases of intrasheath subluxation. The authors concluded that intrasheath subluxation is fairly common in asymptomatic volunteers and a snapping ankle in otherwise asymptomatic patients is highly suggestive of intrasheath peroneal tendon subluxation. Dynamic ultrasound can be used to document this condition. The study suggests that establishing the normal ranges of motion of the peroneal tendons may assist in evaluating patients with lateral ankle pain.

Asset Subtitle

Shefali Kanal, Christopher E. Gross, MD, Caroline P. Hoch, Leah Davis

Keywords

study

peroneal tendons

intrasheath subluxation

ankle circumduction

ankle positioning

dynamic ultrasound

asymptomatic volunteers

lateral ankle pain

motion variation

sonographic images