Outward Dislocation Of The Forearm And Separation Of The Internal Condyle

Illustration from 'Atlas and Epitome of Traumatic Fractures and Dislocations' (by Dr. H. Helferich), 1902. Fig 1 Anatomic specimen from a dislocation of this kind on the right arm anterior view. The lateral displacement of the bones of the forearm is very noticeable. The articular surface of the ulua articulates with the lateral portion of the trochlea and of the capitellum humeri the head of the radius is outside of the joint. The separated interual condyle is attached to the ulna by the internal lateral ligament. Fig 2 Same dislocation in the living subject right arm anterior view. There is little change in the anterior and posterior contour of the arm but on the outer side the head of the radius forms a marked prominence. The findings are readily confirmed by palpation especially when the forearm is rotated from pronation to supination. Fig 3 Bone specimen of the same dislocation and in the same position as in figure 2 seen from the outer side. Right arm- The illustration is intended to explain figure 2 . (Photo by VintageMedStock/Getty Images)