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| Compression fracture ： ウィキペディア英語版 |
Vertebral compression fracture
A compression fracture is a collapse of a vertebra. It may be due to trauma or due to a weakening of the vertebra (compare with burst fracture). This weakening is seen in patients with osteoporosis or osteogenesis imperfecta, lytic lesions from metastatic or primary tumors, or infection.〔(【引用サイトリンク】title=Bone Infections )〕 In healthy patients it is most often seen in individuals suffering extreme vertical shocks, such as ejecting from an ejection seat. Seen in lateral views in plain x-ray films, compression fractures of the spine characteristically appear as ''wedge deformities'', with greater loss of height anteriorly than posteriorly and intact pedicles in the anteroposterior view.
==Signs and symptoms==
Acute fractures will cause severe back pain. Compression fractures which develop gradually, such as in osteoporosis, may initially not cause any symptoms, but will later often lead to back pain and loss of height.
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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