Intrasheath Instability of the Peroneal Tendons: Dynamic Ultrasound Imaging

Ferdinando Draghi, Chandra Bortolotto, Anna Guja Draghi, Salvatore Gitto

Research output: Contribution to journalReview articlepeer-review


Peroneal intrasheath instability is a painful snapping condition of the lateral ankle. It consists of a transient retromalleolar subluxation of the peroneal tendons without disruption of the superior peroneal retinaculum or evidence of a previous definite trauma. In type A intrasheath instability, the peroneus longus and brevis tendons are intact, and there is an intertendinous intrasheath switch. In type B intrasheath instability, the peroneus brevis tendon has a longitudinal split tear through which the peroneus longus subluxates. Both types can be missed on a physical examination because there is no displacement of the peroneal tendons over the lateral malleolus. Dynamic ultrasound is the imaging modality of choice for evaluating retromalleolar subluxation of the peroneal tendons. This review article aims to provide an overview of the anatomic basis for peroneal intrasheath instability and provide physicians with guidelines for its ultrasound assessment.

Original languageEnglish
Pages (from-to)2753-2758
Number of pages6
JournalJournal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine
Issue number12
Publication statusPublished - Dec 2018


Dive into the research topics of 'Intrasheath Instability of the Peroneal Tendons: Dynamic Ultrasound Imaging'. Together they form a unique fingerprint.

Cite this