Traumatic injury of the diaphragm is not an infrequent occurrence. With the rise in violence and increasing use of automobiles, more diaphragmetic injuries may be seen, especially in inner-city hospitals. Sixty-six cases from our institution within the last five years were reviewed. Of these there were 41 penetrating injuries and 23 secondary to blunt trauma. Two cases were surgically induced following a difficult decortication for pleuropulmonary tuberculosis. There were ten deaths (15 percent mortality). All deaths were related to the severity of associated injuries. In addition, we analyzed 307 patients with multiple injuries who were dead on arrival and were autopsied by the county medical examiners in a 24-month period. Of the 307 autopsied cases, 16 (5.2 percent) had ruptured diaphragms. Interestingly, all but one of these cases were associated with thoracic aortic injuries. Diagnoses of penetrating diaphragmatic injuries were made during exploration of other injuries. In blunt diaphragmatic rupture, a high index of suspicion in most important in the diagnosis. In 10 of 23 blunt injuries, visceral herniation was noted on initial x-ray films. In four, follow-up films several hours to a day later showed loops of bowel in the chest. In nine cases, there were no apparent visceral herniations on initial films, and in these, the diagnosis was made during surgery for other indications. The surgical approach to diaphragmatic injuries is individualized. Acute left-sided injuries are best approached through the abdomen. Acute right-sided injuries and all chronic injuries should be approached through the chest.