A Different Type of XXXX With Os Sustentaculum: The Continued Necessity of Revision of Classification.

@entity1 @entity8214 @entity14948 @entity7334 @entity236 @entity130
OBJECTIVE: The objective of our study was to retrospectively determine the prevalence and image findings of extraarticular @entity14948 with os sustentaculum, a type of @entity14948 that does not appear in current classification systems, in @entity1 with an imaging diagnosis of foot coalition. MATERIALS AND METHODS: This study was performed using a database query of radiology reports of ankle and foot CT or MRI examinations performed from August 2001 to November 2013. Eighty-one @entity1 were identified through a keyword search of the database for " @entity14948 ," " @entity8214 ," "coalition," or "os sustentaculum." Imaging features of CT or MRI findings were evaluated. Chart review was used to identify demographic information. RESULTS: Extraarticular @entity14948 with os sustentaculum was diagnosed in 13 @entity1 (nine @entity1 , four @entity1 ), which represents a prevalence of 16.0% (13/81) in all foot coalitions and 24.1% (13/54) in all @entity14948 . Four of 13 @entity1 underwent surgical resection, and histology was obtained in three @entity1 . Nine @entity1 who had no history of @entity130 were symptomatic and all @entity1 with @entity236 at the coalition sites on MRI (n = 5) were also symptomatic. Coexisting extraarticular @entity14948 with os sustentaculum and @entity7334 were observed in 11 of 13 @entity1 . CONCLUSION: The os sustentaculum is a component of extraarticular @entity14948 and as such is usually related to the presence of symptoms. If a @entity1 with an os sustentaculum has symptoms in the medial talocalcaneal joint area, an extraarticular @entity14948 related to the os sustentaculum should be considered.
