. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 602 ABNORMAL CONDITIONS OF THE SHOULDER JOINT. fully examined. The arm was slightly short- ened. The contour of the shoulder was not as full nor as round as that of its fellow, and the acromion process was more prominent than natural. Upon opening the capsular ligament, the head of the humerus was found to have been driven into the cancellated tis- sue of the shaft, between the tuberosities, so deeply as to be below the level of the summit of the great tubercle ; this process had been split and displaced outwards; it for
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 602 ABNORMAL CONDITIONS OF THE SHOULDER JOINT. fully examined. The arm was slightly short- ened. The contour of the shoulder was not as full nor as round as that of its fellow, and the acromion process was more prominent than natural. Upon opening the capsular ligament, the head of the humerus was found to have been driven into the cancellated tis- sue of the shaft, between the tuberosities, so deeply as to be below the level of the summit of the great tubercle ; this process had been split and displaced outwards; it formed an ob- tuse angle with the outer surface of the shaft of the bone. The distance to which the su- perior fragments had penetrated into the shaft is well seen in the wood-cut (Jig. 432.) Fig. 77<e head of the humerus impacted. Nelaton and Smith* have alluded to cases of intra-capsular fractures of the head of the humerus, in which the detached head of the bone became inverted on itself, and was thus impacted into the shaft of the humerus. Nela- ton observes :—"Dr. Dubled showed me a specimen, in which the cap which the summit of the head of the humerus forms had been broken from the shaft, and afterwards in- verted on itself, so that the broken surface of the upper fragments looked upwards and in- wards, while the smooth polished articular part looked downwards, and in this position was buried into the shaft or inferior fragment. Notwithstanding this displacement, consoli- dation had taken ; The superior frag- ment was enveloped by stalactiform produc- tions, which had sprung up from the shaft of the humerus. In the year 1813, Dr. Robert Smith laid before a meeting of the Pathological Society of Dublin, a remarkable specimen of a frac- ture of the neck of the humerus, in which the head of this bone was driven into the shaft, splitting asunder the bone in the situation of the tuberosities. The subject of the observa- tion was a woman, aet. 40, who,
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