Aim: This study was designed to compare the results of spasm controlled lateral sphincterotomy by using anal calibrator 
with those of conventional sphincterotomy 
Method: This study included 96 patients with chronic anal fissure divided into two groups. In conventional 
sphincterotomy group, the extent of sphincterotomy was up to dentate line and in spasm controlled group the extent of 
sphincterotomy at first to the apex of fissure then serial small sphincterotomies and anal caliber measurements followed 
up until an anal caliber of 30 mm was obtained 
Results: The preoperative anal caliber was 26+2.9 (19-26) and 26+2.7 (18-28) mm in conventional group and spasm 
controlled group respectively. Postoperatively the spasm controlled group had a mean anal caliber 32.8+2.4 and in 
conventional group had 34.7+2.4. Delayed healing was occurred in 12.5% of patients in conventional group vs. 4.2% in 
spasm controlled group p =0.06. Incontinence to flatus occurred in 4.2 % of patients in spasm controlled and 16.7 % in 
conventional group p =0.05. relief of pain postoperatively was after 2.1+2.6 days in conventional group and in controlled 
sphincterotomy group after 3.7+3.5 days p=0.09. 
Conclusion: spasm controlled sphincterotomy provided better healing with lower rate of early and late postoperative 
disturbance of continence compared with conventional sphincterotomy.