. A practical treatise on fractures and dislocations. therefore, a disloca-tion of the radius downward below the annular ligament, or, in otherwords, that Duverneys theory was the correct one. He showed fur-ther, that the younger the child the more easily could this displace- 1 Chassaignac : Archives generates de Med., 1856. vol. i. p. 653. 2 Goyrand: Bull, de la Societe de Chir., 1861, p. Pingaud: Loc. cit., 1878. 666 DISLOCATIONS. ment be effected, and the more complete, circularly, would it be. Hewould not assert that this was the only cause of the clinical condition,but contented him
. A practical treatise on fractures and dislocations. therefore, a disloca-tion of the radius downward below the annular ligament, or, in otherwords, that Duverneys theory was the correct one. He showed fur-ther, that the younger the child the more easily could this displace- 1 Chassaignac : Archives generates de Med., 1856. vol. i. p. 653. 2 Goyrand: Bull, de la Societe de Chir., 1861, p. Pingaud: Loc. cit., 1878. 666 DISLOCATIONS. ment be effected, and the more complete, circularly, would it be. Hewould not assert that this was the only cause of the clinical condition,but contented himself with proving that it was at least one ; his reservebeing apparently due to the inapplicability of the explanation to thereported cases iu which the radius was said to have been displacedbackward, cases which we have seen to rest only upon Martins asser-tion. His experiments have been repeated, and his results verified byothers; Poinsot accepts his explanation fully for the usual cases, andStreubePs for those of displacement backward. Fig. Subluxation of the head of the radius. (Pingaud.) Turning now to the clinical evidence, for there have been no post-mortem examinations, it appears that the injury is common in youngchildren between the ages of one and three years, and is rarely seenafter the age of six years, and not infrequently recurs. Goyrand (, 1861) had seen at least two hundred cases in thirty years, andquotes Chabrely (Journal de Medecine de Bordeaux, October, 1860,p. 481) as saying that hardly a month passed, he might say hardly aweek, in which he was not called to a case, and Fougeu as having seenthirty-five cases ; in the discussion that followed the reading of Goy-rands paper, Marjolin stated that he had seen about sixty saw ten cases in ten years in private practice ; and Linde-man 2 saw twenty-four cases and Van Arsdale one hundred in two yearsin dispensary practice. The cause is traction upon the arm at the handor wrist, as in li
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