Type VII All-epiphyseal Fractures of the Lateral Malleolus and the Origin of Subfibular Ossicles.

Journal of Pediatric Orthopedics
James G Gamble

Abstract

A subfibular ossicle (SO), also known as an os subfibulare, is present in ∼1% of the general population. Two theories have been proposed to explain the origin of SOs: (1) as a failure of fusion of a secondary center of ossification; (2) as a posttraumatic sequela. This report offers prospective, longitudinal radiographic evidence for the formation of SOs as a posttraumatic sequela of type VII transepiphyseal fractures of the lateral malleolus in children. This Institutional Review Board-approved study was performed at a tertiary care pediatric hospital from March 2012 to April 2019. The study group included 37 children with a type VII fracture of the lateral malleolus and a minimum follow-up of 6 months. Twenty-one children (57%) healed their fracture. Sixteen children (43%) went on to form SOs. The most common location for the fractures was the distal third of the epiphysis, and the most common fracture type forming SOs was a sleeve avulsion fracture. Four of the children forming SOs have had surgery to address pain and recurrent sprains. Overall, 43% of children who sustained a type VII fracture of the lateral malleolus went on to form SOs, giving support to the posttraumatic theory of origin. Sleeve avulsion fractures have t...Continue Reading

References

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