1病史摘要患者25岁,孕35+5周,因腰骶及右下肢疼痛伴活动受限3+月于2005年1月28日入院。6年前孕40天时曾人工流产1次,术中、术后无阴道大流血。平素月经规律,无经量增多、经期延长。末次月经2004年5月20日,预产期2005年2月27日。孕12周时查血、尿常规、肝肾功能无异常,胎儿生长 A history of patients with 25-year-old, 35 +5 weeks pregnant, due to lumbosacral and right lower extremity pain with limited activity 3 + month in January 28, 2005 admission. 6 years ago 40 days of pregnancy had an abortion 1, intraoperative and postoperative vaginal bleeding. Regular menstruation, no increase in the amount of menstruation. The last menstruation May 20, 2004, the expected date of February 27, 2005. 12 weeks pregnant pregnancy check blood, urine, liver and kidney function was normal, fetal growth