The international encyclopaedia of surgery; a systematic treatise on the theory and practice of surgery . ed any forward or lateral displacementof this bone. With the arm flexed, the olecranon should be on a line withthe posterior surfaces of the humeral condyles, and, as already stated, half-way between them. A forward or backward displacement of this bony pointat once arrests the notice of the surgeon, showing that he has to deal with adislocation or a fracture. DISLOCATIONS OF THE ELBOW. 673 Dislocation of the Head of the Radius Forward.—Causes.—Falls uponthe elbow occasionally drive the he
The international encyclopaedia of surgery; a systematic treatise on the theory and practice of surgery . ed any forward or lateral displacementof this bone. With the arm flexed, the olecranon should be on a line withthe posterior surfaces of the humeral condyles, and, as already stated, half-way between them. A forward or backward displacement of this bony pointat once arrests the notice of the surgeon, showing that he has to deal with adislocation or a fracture. DISLOCATIONS OF THE ELBOW. 673 Dislocation of the Head of the Radius Forward.—Causes.—Falls uponthe elbow occasionally drive the head of the radius, by direct violence, into aposition in front of the joint, and falls upon the hand have been said to causethe same injury. A radius has been known to be displaced forward at itsupper end, simply by lifting a rather feeble child by one hand from the floor.^^ymptoms.—^In this accident the head of the radius is found upon the frontof the humerus, where its presence is certainly proved by making rotationof the forearm while pressing with the thumb over the misplaced bone. Fig. Forward dislocation of the head of the radius ; forearm supinated and extended. Pressure in front of the external condyle discovers the vacuity from whichthe bone has departed. The forearm commonly is somewhat pronated, butmay lie between pronation and supination, and may even be occasionallysupinated. Some flexion usually exists, which can be increased to a rightangle only. There is usually some pain and resistance when the limb iscompletely extended. The sudden locking of the bones which prevents theflexion beyond a right angle, occurs at the moment when the head of theradius strikes the front of the humerus. It is quite characteristic, and differsentirely from mere muscular resistance. The constant tension of the bicepsmuscle is the force maintaining the forward position, and the greatest obstacleto successfully retaining the l)one when reduced. Prognosis.—I have myself had n
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