. A practical treatise on fractures and dislocations. Fig. 2. — Dislocation of Semilunar Bone. PLATE Congenital Dislocation of the Hip. SYMPTOMS AND DIAGNOSIS OF CONGENITAL DISLOCATIONS. 177 is displaced inward ;ui<l backward, and, in short, the entire bone under-goes a change in shape which carries its centre upward and backward,and makes its lateral surface more vortical. If the dislocation is double, the same changes are found on bothsides, and the sacrum is more sharply curved. Congenital dislocation of the shoulder may be either subcoracoid, sub-acromial, or subspinous. II. W. S
. A practical treatise on fractures and dislocations. Fig. 2. — Dislocation of Semilunar Bone. PLATE Congenital Dislocation of the Hip. SYMPTOMS AND DIAGNOSIS OF CONGENITAL DISLOCATIONS. 177 is displaced inward ;ui<l backward, and, in short, the entire bone under-goes a change in shape which carries its centre upward and backward,and makes its lateral surface more vortical. If the dislocation is double, the same changes are found on bothsides, and the sacrum is more sharply curved. Congenital dislocation of the shoulder may be either subcoracoid, sub-acromial, or subspinous. II. W. Smith,1 who was the first to describethem, gives examples and plates of the first two forms. lie found theoriginal glenoid cavity lacking or rudimentary, and the new one welldeveloped either immediately under the coracoid process or on the outerside of the scapula below the acromion. Most of the cases describedas such appear to be traumatic (during delivery) or paralytic. (SeeChapter XLIV.) At the elbow the head of the radius may be displaced upward alongthe anterior surface of the humerus, or backward,
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