Clinically, the term strangulated hernia refers to strangulated abdominal types. It may be defined as "that condition in which the contents of the sac are so constricted or girt about that there follows pain, obstruction, vomiting, irreducibility and absence of expansive impulse."1 The relative frequency of strangulation, based on a report of 529 cases, is as follows:
250 cases of strangulated femoral hernia.
250 cases of strangulated inguinal hernia.
29 cases of all other abdominal types.2
The pathology of strangulation may be considered with reference to the gross anatomy of hernia, the histopathology of the strangulated parts, and the mechanisms precipitating the crisis.
By reference to the gross anatomy it is observed that the constriction may occur in the canal transmitting the hernia, in the hernial sac or its contents (Figs. 1 to 7). If in the canal, it is usually at one of the natural openings or