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Spondylolysis is a defect of a vertebra. More specifically it is defined as a defect in the pars interarticularis of the vertebral arch.〔(【引用サイトリンク】title= Spondylolisthesis )〕 The great majority of cases occur in the lowest of the lumbar vertebrae (L5), but spondylolysis may also occur in the other lumbar vertebrae, as well as in the thoracic vertebrae. Spondylolysis occurs in three to six percent of the population. ==Signs and symptoms== Spondylolysis pain can lead to reduced mobility and inactivity. Inactivity can result in weight gain, loss of bone density, and loss of muscle strength and flexibility of other areas of the body. Spondylolysis can progress until one or more vertebrae slip out of place which is then called spondylolisthesis. Over time, degenerative changes of spondylolysis can cause serious complications including:〔http://www.emedicinehealth.com/spondylosis/page14_em.htm〕 *low back, mid back, and neck pain *Spinal Stenosis – where the spinal canal becomes narrow and the spinal cord can become pinched; can occur in the neck or low back. *Cauda equina syndrome – a syndrome where the nerves at the bottom of the spinal cord are compressed by an intervertebral disc or mass; rare but can cause severe nerve problems. *Radiculopathy – a condition where one or more spinal nerves are compressed. *Spinal Myelopathy – 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spondylolysis」の詳細全文を読む スポンサード リンク
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