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March fracture
March fracture, also known as fatigue fracture or stress fracture of metatarsal bone, is the fracture of the distal third of one of the metatarsals occurring because of recurrent stress. It is more common in soldiers, but also occurs in hikers, organists, and even those, like hospital doctors, whose duties entail much standing. March fractures most commonly occur in the second and third metatarsal bones of the foot.〔Hamilton Bailey's Demonstrations of Physical Signs in Clinical Surgery ISBN 0 7506 0625 8〕〔(【引用サイトリンク】url=http://www.patient.co.uk/health/Metatarsal-Fractures.htm )〕 It is a common cause of foot pain, especially when people suddenly increase their activities.〔http://orthopedics.about.com/cs/lowerfx/g/march.htm〕
== Occurrence ==
Stress fractures can occur at many sites in the body; "march fracture" simply refers to a stress fracture specifically of the metatarsals, so named because the injury is sometimes sustained by soldiers during sustained periods of marching.〔 Although march fractures can occur to the 5th metatarsal, fractures of this bone are more likely to be trauma-related fractures to the diaphysis, termed Jones fractures. In runners, march fracture occurs most often in the metatarsal neck, while in dancers it occurs in the proximal shaft. In ballet dancers, fracture mostly occurs at the base of the second metatarsal and at Lisfranc joints. This fracture always occurs following a prolonged stress or weight bearing, and the history of direct trauma is very rare. Consideration should always be given to osteoporosis and osteomalacia. Cavus feet are a risk factor for march fracture.〔http://www.wheelessonline.com/ortho/metatarsal_stress_frx〕
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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