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The principle of a screw-controlled extension apparatus rigidly attached to a divided plaster cast has long been used by a number of surgeons in the treatment of certain simple and compound fractures of both bones of the leg. The screw-extension apparatus so far described has been of a rigidly built type, often quite expensive and procurable only through instrument makers. This type of apparatus is usually not available when needed; and, when it is available, often the mechanical perfection of its construction tends to make it too rigid to be readily adapted to the exigencies of individual cases. The screw extension apparatus employed by me is so constructed that it can be readily fitted to any cast at any point from the ankle to the knee, and can be altered at will to meet any special requirements of individual cases.
Figure 1 illustrates the general construction of the extension units.
Stanton EM. A SIMPLE, INEXPENSIVE AND EFFICIENT EXTENSION APPARATUS FOR TREATING FRACTURES OF THE TIBIA AND FIBULA. JAMA. 1923;80(13):915–917. doi:10.1001/jama.1923.26430400003012c
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