Backwards Dislocations Of The Forearm

Illustration from 'Atlas and Epitome of Traumatic Fractures and Dislocations' (by Dr. H. Helferich), 1902. Fig 1 Anatomic specimen showing a backward displacement artificially produced in the cadaver right arm. We see the shaft of the humerus and its lower articular extremity below and bchind it the dislocated head of the radius and at the upper end of the ulua the semiluuar fossa. The external lateral ligament and annular ligament are faithfully reproduced. On the anterior surface of the humerus, the biceps, and its tendon and underneath the brachialis anticus; may be seen behind the humerus the triceps with its insertion on the tip of the olecranon is discernible. Fig 2 The same dislocation in the living subject right arm. The arm is flexed at an obtuse angle the tip of the olecrauon forms an abnormal prominence to the inner side of which is another spherical prominence corresponding to the head of the radius. The longitundinal axis of the humerus instead of being directed toward the end of the forearm divides it into a short posterior and a long anterior segment. (Photo by VintageMedStock/Getty Images)