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Jones fracture
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Jones fracture : ウィキペディア英語版
Jones fracture

A Jones fracture is a fracture in the meta-diaphyseal junction of the fifth metatarsal of the foot. The proximal end of the metatarsal, where the Jones fracture occurs, is near the midportion of the foot, on the fifth ray (of which the 5th toe belongs). Those who sustain a Jones fracture have pain over this area, swelling, and difficulty walking. The fracture was first described by orthopedic surgeon Sir Robert Jones who sustained this injury himself (while dancing) and reported it in the ''Annals of Surgery'' in 1902.
==Diagnosis==
A patient with a Jones fracture may not realize that a fracture has occurred. Diagnosis includes the palpation of an intact peroneus brevis tendon, and demonstration of local tenderness distal to the tuberosity of the fifth metatarsal, and localized over the diaphysis of the proximal metatarsal. Bony crepitus is unusual.
This injury should be differentiated from the developmental apophysis (5th metatarsal tuberosity) commonly and normally occurring at this site in adolescents. Differentiation is possible by characteristics such as absence of sclerosis of the fractured edges (in acute cases) and orientation of the lucent line: transverse (at 90 degrees) to the metatarsal axis for the fracture (due to avulsion pull by the peroneus brevis muscle inserting at the proximal tip) - and parallel to the metatarsal axis in the case of the apophysis. Diagnostic x-rays include anteroposterior, oblique, and lateral views and should be made with the foot in full flexion.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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