. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1508 WRIST-JOINT (ABNORMAL ANATOMY). intervenes between the carpus and that bone. These circumstances taken in connection with the remarkable mobility of the lower radio- ulnar articulation sufficiently explain why the ulna so frequently escapes injury from forces which act on the hand, and which suffice to fracture the radius. At the same time it is to be observed, that displacements of the lower extremity of the ulna are by no means unlre- quent accompaniments of fractures of the radius. (Benjamin Gco. M'Dowel.) WRIST,
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1508 WRIST-JOINT (ABNORMAL ANATOMY). intervenes between the carpus and that bone. These circumstances taken in connection with the remarkable mobility of the lower radio- ulnar articulation sufficiently explain why the ulna so frequently escapes injury from forces which act on the hand, and which suffice to fracture the radius. At the same time it is to be observed, that displacements of the lower extremity of the ulna are by no means unlre- quent accompaniments of fractures of the radius. (Benjamin Gco. M'Dowel.) WRIST, ABNORMAL CONDITIONS OF.— In the following account of the abnormal con- dition of the different structures which enter into the composition of the wrist, we shall consider this region as formed not only by the lower extremities of the bones of the forearm and the wrist-joint, properly so called, but also by the carpus surrounded by its fibrous and fibro-synovial tissues. The abnormal condition of the different .structures of this region mav be arranged uu- C1 ./ O tier those which we can refer—1st, to conge- nital malformation; 2nd, to accident; and 3rd, to disease. CONGENITAL. — Congenital dislocation of the bones which constitute the radio-carpal articulation may be considered rare; never- theless, I have seen within these few years thirteen examples of this malformation. One, in which the bones of the forearm were thrown forwards and the carpus backwards. In the remaining twelve cases, the bones of the forearm were placed on the clorsum of the carpus, which they overlapped. The history of congenital luxations of the wrist-joint is modern. Cruveilhier, in his Pathological Anatomy (liv. ix., 1833), has published an example of this deformity, al- though he was not himself aware of the true nature of the case. The example he adduces is that of an adult female, concerning whose history, unfortunately, he could learn nothing. In this case the forearm was preternaturally sho
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