Abstract. The purpose of this study was to investigate the influence of the paralysis of some respiratory muscles, due to a spinal cord lesion, on the lung volumes and the mechanics of breathing, specially on the maximal expiratory flows. Fifty-two tetraplegics have been studied, divided in two groups-according to the level of the lesion to investi gate if there is any difference in the behaviour of both groups.

Semiautomatic measurements (seed method with half moon background and aliasing correction) allow a generalization of the calculus of flow parameters with great consistency and independency of the operator.

Abstract. The X-ray examination of 704 spinal cord injured patients have showed that in 20 per cent of the cases para-articular ossifications were present most frequently in the hips. They were less frequently found in non-traumatic and incomplete cases. No other clear relationship was found.

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