. Atlas and epitome of traumatic . \m ^V Lilh. Aftst. /: Retr/iliold. Muiichm. FRACTURES OF THE UPPER EXTREMITY. 187 5. ELBOW (A) Dislocations In the examination of dislocations of the elbow-joint anaccurate knowledge of the outlines of the normal joint isindispensable. We feel the condyles, the olecranon, andtheir relations to one another in various positions of thejoint; underneath the external condyle the head of theradius is distinctly felt, especially if the forearm is alter-nately pronated and sup-inated. In dislocationsthe articular extremitiescan often be distinctlyfelt—the head of the
. Atlas and epitome of traumatic . \m ^V Lilh. Aftst. /: Retr/iliold. Muiichm. FRACTURES OF THE UPPER EXTREMITY. 187 5. ELBOW (A) Dislocations In the examination of dislocations of the elbow-joint anaccurate knowledge of the outlines of the normal joint isindispensable. We feel the condyles, the olecranon, andtheir relations to one another in various positions of thejoint; underneath the external condyle the head of theradius is distinctly felt, especially if the forearm is alter-nately pronated and sup-inated. In dislocationsthe articular extremitiescan often be distinctlyfelt—the head of theradius with its centraldepression, the capitel-lum humeri, trochlea, andthe upper end of the the examination to beaccurate, not only eachindividual bony promi-nence must be recognized,but the position of all thebony parts and their rela-tion to one another mustbe accurately demonstrat-ed, even if they cannot allbe directly palpated. Itis well to have a skeletonof an arm at hand in set-. Fig. 81.—Recent backward dislo-cation of the left forearm in a boyfourteen years of age (Kriiger, 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 co
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