The prime feature of cannulated screws is that they can be inserted over a guide wire or guide pin. The diameter of the guide pin is much smaller than the cannulated screw and therefore can be more precisely placed using fluoroscopy in the operation theatre.
Cannulated screws have a hollow central shaft and both cortical and cancellous screws can be cannulated. Cannulated cancellous screws are used for metaphyseal fractures while cannulated and non cannulated cortical screws are used as lag screws for fixation of diaphyseal fractures. A special type of cannulated cancellous screw which is called as Knowles pin is a cannulated screw used for fixation of slipped capital femoral epiphysis in children. Narang Medical Limited offers Cortical and Cancellous cannulated screws in various lengths and with diameters varying from 2.7 to 7.3 mm. You may find more details here: www.orthopaedic-implants.com/cannulated-screws
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