Abstract
Fractures of the proximal fifth metatarsus are common injuries of the foot, but sometimes remains undiagnosed. The aim of this study was to determine whether sonography can diagnose radiographically missed fifth metatarsal fractures. Twenty-two patients were referred over a 3 years period for an orthopaedic opinion with diagnosis of ankle sprain due to inversion injury of the foot and ankle. All the patients had undergone three standard radiograms of the ankle, which had been reported as normal. All patients underwent ultrasonographic examination of the injured foot and ankle. Subsequent radiographs of the foot were performed to confirm the diagnosis. The diagnosis of proximal fifth metatarsal fractures was made by the ultrasound and was confirmed by imaging in all patients. A bone scan confirmed the diagnosis in two patients that plain radiograms did not confirm it. We found that ultrasound is very efficient and accurate tool in the diagnosis of occult fractures of proximal fifth metatarsus.
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