1.   Both sensory and reflex anal functions were preserved as well after operation in the older patients as in the younger ones.

2.   Anal sphincteric function was then assessed quantitatively in our physiology laboratory.

3.   Adequacy of anal sphincteric function should then be confirmed by means of laboratory tests of anal pressure and sensation.

4.   Patients who give a histoiry of previous anal fistula or abscess represent another subgroup in whom objective measurement of anal sphincteric function before operation is essential.

5.   On the other hand, in adult megacolon with a megarectum, the results are extremely good provided small bowel and anal function are normal.

6.   Elderly patients should not necessarily be denied the operation if they are fit and have normal anal function.

7.   Most patients showed a persistent improvement in anal motor function.

8.   This may explain the finding of normal anal motor function in many incontinent patients.