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Stress fracture
:''This article is about stress fractures in bones. For stress fractures in engineering, see fracture and fatigue (material).''
A stress fracture, also known as a hairline fracture, is a fatigue-induced fracture of the bone caused by repeated stress over time. Instead of resulting from a single severe impact, stress fractures are the result of accumulated trauma from repeated submaximal loading, such as running or jumping. Because of this mechanism, stress fractures are common overuse injuries in athletes.
Stress fractures can be described as a very small sliver or crack in the bone;〔(【引用サイトリンク】title=Stress fractures - MayoClinic.com )〕 and are sometimes referred to as "hairline fractures". Stress fractures most frequently occur in weight-bearing bones, such as the tibia (bone of the lower leg), metatarsals, and navicular bones (bones of the foot). Less common are fractures to the femur, pelvis, and sacrum.
==Signs and symptoms==
Stress fractures most commonly present as pain with weight bearing that increases with exercise or activity. The pain usually subsides with rest but may be constantly present with a more serious bone injury. There is usually an area of localized tenderness on or near the bone and generalized swelling to the area. Percussion or palpation to the bone may reproduce symptoms.〔
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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