[A method for measuring the function of the organ of continence]

For preoperative assessment of anal continence we developed a simple device to measure both anal sphincter function and sensitivity of the rectal ampulla. With this instrument anorectal function was studied in 19 males and 26 females without anorectal disorders. Anal resting tone and voluntary squeeze was higher in the males than in the females. Threshold of rectal sensation and critical volume, however, were higher in females. The new device appears to work precisely enough for accurate clinical evaluation. It is less time-consuming than electromanometric methods currently in use.