. On modern methods of treating fractures . metal in such a way that it nevercan become loose from the plate. In applying this principle,the plate must be firmly clamped against the bone, plain holesbeing made into the latter by a drill which does not touch thethread of the holes in the plate. The self-tapping screws are OPERATIVE TREATMENT OF FRACTURES 203 now driven into the bone and screwed tight. The grip of thescrews will then be between the screw and the plate, and notbetween the screw and the bone. But there are two difficulties in carrying out this device ofthreading the screws in the
. On modern methods of treating fractures . metal in such a way that it nevercan become loose from the plate. In applying this principle,the plate must be firmly clamped against the bone, plain holesbeing made into the latter by a drill which does not touch thethread of the holes in the plate. The self-tapping screws are OPERATIVE TREATMENT OF FRACTURES 203 now driven into the bone and screwed tight. The grip of thescrews will then be between the screw and the plate, and notbetween the screw and the bone. But there are two difficulties in carrying out this device ofthreading the screws in the plates. One is that the plate mustbe at least ^ in. thick to carr^^ sufficient screw threads, andthis makes it somewhat clumsy and bulky for a small other is that the plate has to be firmly clamped against thebone whilst the screw is being inserted, otherwise the screw willseparate the plate from the bone. These difficulties have led to the adoption of a different methodof fixing the screws to the plates. Figs, 104, 105 show small. Fig. 106.—Double cairved plates. One serves to secure the heads of thescrews in the other.
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidonmodernmethodso00grov
