. A practical treatise on fractures and dislocations. t its forepart, and the oblique had given capsular ligament was partially torn, and thehead of the radius would have receded still more,had it not been supported by the fascia whichextends over the muscles of the forearm. Theaccompanying figure (Fig. 310) indicates that thehead of the radius had risen very slightly abovethe lowest part of the articular portion of the con-dyle, and that its position was probably the sameas in Mr. Rivingtons case. In another specimen of old dislocation presentedto the Society de Chirurgie by Bernadet,
. A practical treatise on fractures and dislocations. t its forepart, and the oblique had given capsular ligament was partially torn, and thehead of the radius would have receded still more,had it not been supported by the fascia whichextends over the muscles of the forearm. Theaccompanying figure (Fig. 310) indicates that thehead of the radius had risen very slightly abovethe lowest part of the articular portion of the con-dyle, and that its position was probably the sameas in Mr. Rivingtons case. In another specimen of old dislocation presentedto the Society de Chirurgie by Bernadet,3 the headof the radius had been displaced a little backward,downward, and outward; the external lateral liga-ment entirely covered the cup-shaped surface ofthe head; the annular ligament no longer existedexcept upon the inner side, and there it was notably thickened andobliquely deviated. 1 Rivington : Lancet, 1879, vol. ii. p. 942. 2 Petit: Bull, de la Societe Anatomique, 1874, p. 904. 3 Bernadet: Bull, de la Soc. de Chir., 1861, p. 462. Fig. Dislocation of thehead of the radiusbackward. (Cooper.) DISLOCATIONS OF THE RADIUS ALONE. 657 In the specimens which Streubel obtained by experimenl he always found tlie anterior portion of (lie capsule lorn and the capitellumprojecting through the rent; the external lateral ligament was more orless torn at its anterior border, the internal lateral Rgamenl uninjured ;the annular ligament was always torn in front, either at its insertionby the lower sigmoid cavity, or further outward ; the oblique ligamentwas torn, doubtless in consequence of the exaggerated supination. These facts, though not numerous or entirely free from objection,indicate that the position of the dislocated head of the radius, even infull extension, is lower than that commonly assigned to it in systematicdescriptions and shown in the plates accompanying them—that it doesnot rise above the shallow groove which marks the posterior and lowermargin of the articula
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