By Jens J. Ernberg, Stanley E. Asnis (auth.), Stanley E. Asnis M.D., Richard F. Kyle M.D. (eds.)
Cannulated Screw Fixation is the 1st quantity of its style to supply either the biomechanics of those screw platforms in addition to whole operative concepts. This booklet teaches the orthopaedic health care professional and resident all facets of cannulated screw fixation from ideas (biomechanics, layout, fabrics, production) to scientific makes use of together with anatomy, imaging suggestions, merits, problems and results. This finished textual content comprises chapters written by means of recognized orthopaedists of their respective anatomical parts with fabric on most well liked working ideas and makes use of in additional really good medical events for either top and reduce extremities. Edited by way of pioneers within the improvement of the cannulated screw this quantity is a "must have" for all orthopaedic surgeons and residents.
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Extra resources for Cannulated Screw Fixation: Principles and Operative Techniques
F. E. M. R. Chapman Screw Holding Power Fs The resistance to pullout, or holding power of a screw in a porous material such as cancellous bone, is dependent on six factors. Three are related to the geometry of the screw: its outer diameter,13 its length of engagement in bone including the degree to which it passes through cortex,14 and the geometry of its threads including depth and pitch 1S- 17 but not tooth profile. 1s,18 The other three factors relate to preparation of the hole into which it is placed: the shear strength of the bone that the threads engage,17,19-2S pilot hole size,4,19,26 and tapping.
Biomechanics of Cannulated and Noncannulated Screws 38 in bone without stripping is related to the geometry of the screw thread: its outer diameter, its length of engagement in bone, particularly cortex, and the geometry of its threads including depth and pitch, as well as the shear strength of the bone it is placed into. This is given by the relationship described previously: Fs = 5 x (L x 1t X Dmajor ) x TSF When comparing cannulated screws with solid screws of nearly equivalent dimensions, in similar bone stock, the thread shape factor (TSF) becomes important.
9. The effect of thread pitch on the linear advance of a screw for a single turn. 2. Biomechanics of Cannulated and Noncannulated Screws 22 24 I I. • • • ••• • •• • • 16 8 ..... .. . 10. Experimentally measured relationship between the torque applied to a screw and the resulting compressive force between the two surfaces (adapted from Nunamaker and Perren"). down the plate, and due to the fridional force between plate and bone, it is transmitted back into bone on the other side of the fradure gap.