There is growing awareness that the majority of traumatic splenic injuries should be managed non-operatively. This review of all traumatic spleen injuries at a large community teaching hospital over a 10-year period (1978-1988) confirms that principle. The study generated selection criteria and principles of non-operative management. Of a total of 91 patients, 23 were initially treated non-operatively. The average age was 27 years and all but two were adults. Splenic injury was confirmed by computed tomography scan in 20 patients (87 per cent) and by liver/spleen scan in three patients (13 per cent). Of the 23 patients, 21 (91 per cent) were successfully treated non-operatively. Of these, 14 had intraparenchymal or subcapsular haematomas and seven had splenic lacerations with haemoperitoneum. Two patients (9 per cent) initially treated non-operatively required splenectomy. Haemodynamically stable adult patients with blunt splenic injuries can be managed non-operatively if monitored in a setting where immediate operative intervention is available. Operative intervention is indicated not only in haemodynamically unstable patients, but also in patients who require more than four units of blood during a 48-h period.