强直性脊柱炎(AS)是一种病因不明的全身性疾病,主要以侵犯骶骼关节、脊柱骨突、脊柱旁软组织和外周关节等的慢性炎症[1]。常见于青少年,尤其以女性多见,与遗传密切相关,多有家族聚集倾向。AS患者主要以臀髋部或腰背部疼痛或发僵为临床常见症状,随着病情进展向腰椎、胸椎发展[2]。近期,我们对我院2009年3月-2013年2月以下腰痛为主诉收治住院的297例的临床资料进行回顾分析,其中AS Ankylosing spondylitis (AS) is a systemic disease of unknown etiology that mainly affects chronic inflammation of sacroiliac joints, spondylosclerosis, paravertebral soft tissues, and peripheral joints [1]. Common in adolescents, especially in women more common, closely related with the genetic, and more family aggregation tendency. AS patients mainly hip or lower back pain or stiff neck clinical symptoms, with the progress of the disease to the lumbar, thoracic development [2]. Recently, we retrospectively analyzed the clinical data of 297 hospitalized patients who underwent low back pain in our hospital from March 2009 to February 2013, of which AS