目的：研究肛门内括约肌部分切开结扎术治疗陈旧性肛裂的临床疗效。方法：160例陈旧性肛裂病人通过随机数字表分成两组。研究组80例采用内括约肌部分切开结扎术。对照组80例采用内括约肌后方切断术。统计两组术后各时间点创面大小、疼痛评分、出血评分、肛门功能及住院时间和切口创面愈合时间。结果：研究组和对照组有效率均100%。研究组治愈率为100%,优于对照组97.5%,差异有统计学意义（P<0.05）。研究组术后第1、3、5、7天创面面积均小于同期对照组,差异有统计学意义（P<0.05）。研究组术后第1、3、5、7天疼痛评分、出血评分、均小于同期对照组,差异有统计学意义（P<0.05）。研究组术后创面愈合后Wexner肛门功能失禁评分低于对照组,差异有统计学意义（P<0.05）。研究组住院时间以及切口创面愈合时间均短于对照组,差异有统计学意义（P<0.05）。结论：肛门内括约肌部分切开结扎术治疗陈旧性肛裂疗效确切安全,具有加速创面愈合、术后出血少、疼痛轻等优势,肛门功能保护良好。

Objective To study the effect of lateral internal partial sphincterotomy and ligation on chronic anal fissure. Methods A total of 160 patients with chronic anal fissure were randomly divided into two groups. Eighty cases both in study group treated with lateral internal partial sphincterotomy combined with ligation and in control group treated with internal sphincter resection were studied. Incision size, pain score, bleeding score, anal function, hospital stay and incision would healing day on different days after operation in two groups were analyzed. Results Treatment efficacy was 100% in both groups. Cure rates was 100% in study group and 97.50% in control group (P<0.05). Incision sizes on the 1st, 3rd, 5th and 7th day after operation in study group were significantly smaller than those same-day in control group(P<0.05). Both pain score and bleeding score on the 1st, 3rd, 5th and 7th day after operation in study group were significantly lower than those same-day in control group (P<0.05). Wexner anal incontinence scores after wound healing in study group were significantly lower than those in control group(P<0.05). Hospital stay and incision wound healing day in study group were less than those in control group significantly (P<0.05). Conclusions Lateral internal partial sphincterotomy and ligation would be effective and safe in treatment of chronic anal fissure with advantages including less days of wound healing, less postoperative bleeding and pain combined with protection of anal function.