Incision of internal sphincter is often used for the treatment of chronic anal cleft. This study was to compare two approaches- lateral position incision vs. in-situ incision for their effect on anal function. The 160 patients were randomly divided to two groups and received operation accordingly. Patients' rectal pressures, rectal sensation functions, governing of anal fluid were monitored before and after operation. Results showed that in-situ incision has greater adversary impact on anal function than lateral position incision.%研究侧位与原位切断内括约肌治疗陈旧性肛裂术后肛门功能的变化.将160例陈旧性肛裂患者随机分为2组采用侧位与原位内括约肌切断术治疗,并于术前术后进行肛管直肠压力、直肠感觉功能和肛门液体节制功能的测定,较客观的进行术后肛门功能评估.结果原位切断内括约肌对肛门功能影响较侧位切断内括约肌大.
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