. A practical treatise on fractures and dislocations. iuswas found to have been broken off. In two of Lbbkers2 cases apiece was broken from the outer portion of the head, which suggests,what is probable also on other grounds, that abduction of the forearmmay also be a factor. 1 Malgaigne: Loc. cit., p. 651. 2 Lobker : Beilage zum Centralblatt fur Chir., 1886, No. 24, p. 92. DISLOCATIONS OF THE RADIUS A LOSE 661 In a case reported by Ross the dislocation occurred during an epi-leptic convulsion and was attributed to muscular action, the unopposedcontraction of the biceps and pronator radii tere
. A practical treatise on fractures and dislocations. iuswas found to have been broken off. In two of Lbbkers2 cases apiece was broken from the outer portion of the head, which suggests,what is probable also on other grounds, that abduction of the forearmmay also be a factor. 1 Malgaigne: Loc. cit., p. 651. 2 Lobker : Beilage zum Centralblatt fur Chir., 1886, No. 24, p. 92. DISLOCATIONS OF THE RADIUS A LOSE 661 In a case reported by Ross the dislocation occurred during an epi-leptic convulsion and was attributed to muscular action, the unopposedcontraction of the biceps and pronator radii teres. Pathology. No autopsies have been reported in recentcases. Inexperiments upon the cadaver (Streubel^ Pingaud) the capsule has beenfound torn transversely in front close to its attachment to the humerus(Fig. 312), and the annular ligament untorn and encircling only theneck of the radius while the head projected forward through the rentin the capsule and rested, by its posterior edge only, against the artic-ular surface of the capitellum. Fig. Hiltons case of dislocation of the head of the radius forward. In a number of cases, ten or twelve, the opportunity has arisen toexamine old dislocations. Malgaigne has described his own, quotedabove, in which the posterior fourth of the head of the radius wasbroken off and the capsule was intact, and two specimens in the MuseeDupuytren (cases of Desault and Prestat). Cooper2 describes andfigures a specimen preserved at St. Thomass Hospital; the others arethose of Danyau,3 Debruyn,4 two cases, Hilton/ Trelat,6 Kronlein,7 aspecimen in the Museum at Zurich, and Lobker, the two cases abovereferred to ; see, also, In Malgaignes, Danyaus, one of Debruyns, Trelats, and the twospecimens of the Musee Dupuytren the annular ligament was stretchedbut not torn; in Hiltons its upper portion was torn, but the moreexternal and superficial fibres remained intact and were closely wrappedabout the neck of the radius; in Coopers the annul
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