. A practical treatise on fractures and dislocations. ^, or it may be displaced to a variable distance backward or backward and up-ward. The lowest point at which itscentre rests is the base of the spineof the ischium (Adams ^ and Quain ^)overlapping both sciatic notches; andthe highest, except perhaps in excep-tional cases, appears to be opposite theapex of the great sciatic notch, Avhich,in the recumbent position, is directlybelow the anterior superior spine of theilium, the line uniting the two passingabout an inch above the margin of thecotyloid cavity. Fifty years ago Quaindemonstrated by
. A practical treatise on fractures and dislocations. ^, or it may be displaced to a variable distance backward or backward and up-ward. The lowest point at which itscentre rests is the base of the spineof the ischium (Adams ^ and Quain ^)overlapping both sciatic notches; andthe highest, except perhaps in excep-tional cases, appears to be opposite theapex of the great sciatic notch, Avhich,in the recumbent position, is directlybelow the anterior superior spine of theilium, the line uniting the two passingabout an inch above the margin of thecotyloid cavity. Fifty years ago Quaindemonstrated by autopsy the errorcontained in the name given by SirAstley Cooper to the lower form of dislocation into the sciatic notch,and formally called attention to it; and a few years later Malgaigneshowed that the head of the bone was much less upon the ilium in thehigher form than was supposed, and further that in many, perhaps a 1 Adams : Loc. cit. 2 Quaiu : Medico-Chirurgical Transactions, 1848, vol. xxxi. p. 337. Fig. 433. Pyriformis. Oht. ext. Obt. mt Dislocation below and then behind andabove the obturator internus. BACKWARD DISLOCATIONS OF THK HIP. majority, of the dislocations upon the dorsum ilii ^ the femur left thesocket at its lower posterior part and subsequently ])assed upward, sothat in such cases the primary dislocation was ischiatic, and the^^ iliac ^^ was secondary. This view has been amply confirmed. In 11specimens of old dislocations which Malgaigne examined, the head ofthe femur rose in 5 only to the level of a line drawn from, the anteriorsuperior spine of the ilium to the apex of the great sciatic notch, in 2it rose half a centimetre above this line, in 2 one centimetre, in 1 oneand a half centimetres, and in 1 two centimetres. There is no reasonto suppose that in old dislocations the head is at a lower level than inrecent ones, indeed it is probably somewhat higher. When the head of the femur leaves the socket at its lower part itpasses usually below the ob
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfractur, bookyear1912
