. A practical treatise on fractures and dislocations. one case of unilateral dislocation backward—of the sixth cervical—and even in it there was also fracture of the lamina and bodyof the seventh vertebra on the side of the dislocation. DISLOCATIONS OF THE CERVICAL VERTEBRAS, incut beyond its normal limits, by any force which over-abducts orover-rotates the upper part of the column. This force may be anexternal oik!, or oik! developed by the muscles attached to the these dislocations by muscular action Volker1 collected fourteen more or less certain cases, and made them the basis
. A practical treatise on fractures and dislocations. one case of unilateral dislocation backward—of the sixth cervical—and even in it there was also fracture of the lamina and bodyof the seventh vertebra on the side of the dislocation. DISLOCATIONS OF THE CERVICAL VERTEBRAS, incut beyond its normal limits, by any force which over-abducts orover-rotates the upper part of the column. This force may be anexternal oik!, or oik! developed by the muscles attached to the these dislocations by muscular action Volker1 collected fourteen more or less certain cases, and made them the basis of a careful studyof the subject. Additional cases have since been reported. The move-ment which produces (lie lesions is a sudden turn of the head to oneside; if it is violent, ill regulated, if its momentum is unchecked bythe antagonistic muscles, it carries tlie head beyond its normal limit,and produces the dislocation in exactly the same manner as if an ex-ternal force had been applied to the head to turn it in the same direc-tion. Fig. Complete unilateral dislocation by rotation or abduction. In diastasis the lesion consists essentially of more or less extensiverupture of the ligaments. It is the same in its forms, nature, andetiology as the other varieties, with the exception of the persistent dis-placement of the bones and of the change in the relations of the artic-ular surfaces to each other; the displacement is either entirely absentor is slight. A singular instance of the production of a diastasis bymuscular action is reported by Lasalle:2 a crazy man, confined in astrait-jacket in a chair, jerked his head violently backward and for-ward, became at once paralyzed, and died a few hours later. Theautopsy disclosed a separation between the fifth and sixth cervical ver-tebrae, with rupture of the posterior ligament, the interspinous muscles,the ligamenta flava, and the intervertebral disk. The possible produc-tion of haematomyelia is to be borne in mind. Sympto
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