. Atlas and epitome of traumatic . 1896).Swelling, prominence of the olecra-non, shortening of the forearm areseen. The dislocation was reducedand perfect recovery ensued. ting these injuries. We distinguish dislocation of both bones of the forearm{luxatio antibraehii), and luxation of one bone alone (lux-atio radii, luxatio ulnce). (a) Backward Dislocation of the Forearm (Plate38).—This is the easiest dislocation to produce in the 188 FRACTURES AND DISLOCATIONS. cadaver. The arm need only be overextended to producea tear in the anterior segment of the articular capsule ; theolecranon during t
. Atlas and epitome of traumatic . 1896).Swelling, prominence of the olecra-non, shortening of the forearm areseen. The dislocation was reducedand perfect recovery ensued. ting these injuries. We distinguish dislocation of both bones of the forearm{luxatio antibraehii), and luxation of one bone alone (lux-atio radii, luxatio ulnce). (a) Backward Dislocation of the Forearm (Plate38).—This is the easiest dislocation to produce in the 188 FRACTURES AND DISLOCATIONS. cadaver. The arm need only be overextended to producea tear in the anterior segment of the articular capsule ; theolecranon during this movement is braced against the pos-terior supratrochlear fossa, and after the bones have beensufficiently forced apart, the forearm is suddenly pushedbackward and then flexed at the elbow-joint—the disloca-tion is complete. The arm is fixed at an obtuse angle atthe elbow. Further flexion is prevented by the pressureof the coranoid process against the articular extremity ofthe humerus and by the pull of the triceps Fig. 82.—Backward dislocation of the forearm ; skiagraph. Olddislocation in a man twenty-five years of age (A. PreDgschart). Thedislocation was reduced and a good result obtained. This dislocation frequently occurs in the living subjectand is often produced by the same mechanism. The in-jury is said also to be produced by overflexion and forcedlateral movement or by a force striking the lower end ofthe humerus directly from behind. The symptoms are easily understood. The promi-nence of the olecranon is conspicuous; the lower end ofthe humerus is hidden under the soft parts at the bend ofthe elbow, but may be felt somewhat more distinctly if FRACTURES OF THE UPPER EXTRE3IITY. 189 Method of Reducing a Backward Dislocation of the Forearm.
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