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Download e-book for kindle: Cannulated Screw Fixation: Principles and Operative by Jens J. Ernberg, Stanley E. Asnis (auth.), Stanley E. Asnis

By Jens J. Ernberg, Stanley E. Asnis (auth.), Stanley E. Asnis M.D., Richard F. Kyle M.D. (eds.)

ISBN-10: 1461223261

ISBN-13: 9781461223269

ISBN-10: 1461275032

ISBN-13: 9781461275039

Cannulated Screw Fixation is the 1st quantity of its style to supply either the biomechanics of those screw structures in addition to whole operative ideas. This e-book teaches the orthopaedic medical professional and resident all points of cannulated screw fixation from rules (biomechanics, layout, fabrics, production) to scientific makes use of together with anatomy, imaging options, benefits, problems and results. This finished textual content comprises chapters written by means of recognized orthopaedists of their respective anatomical components with fabric on hottest working thoughts and makes use of in additional really expert medical occasions for either higher and reduce extremities. Edited via pioneers within the improvement of the cannulated screw this quantity is a "must have" for all orthopaedic surgeons and residents.

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Additional info for Cannulated Screw Fixation: Principles and Operative Techniques

Sample text

In dense (cortical) bone, tapping is occasionally necessary so that sufficient torque transmitted by the screw is used to create compressive force instead of being absorbed by cutting threads. On the other hand, for low-density (cancellous) bone, tapping is detrimental since it enlarges the 39 hole and reduces purchase strength. In these circumstances, the bone is usually weak enough so that resistance to insertion is not an important issue. Cannulated screws provide significant advantages over solid screws when the screw must be carefully positioned, and they aid in gaining control and temporary reduction of fracture components.

Extraction components following total knee arthroplasty. strength of cannulated cancellous bone screws. J Clin Orthop 1989;247:220-231. Orthop Trauma 1993;7:138-141. 20. Brantley HEV, Mayfield JK, Koeneman JB, Clark 35. Leggon R, Lindsey RW, Doherty BJ, Alexander J, K. The effects of screw size and bone density on Noble P. The holding strength of cannulated pedicle screw fixation and stiffness. Orthop Res screws compared with solid core screws in corSoc 1994;19:718. tical and cancellous bone. J Orthop Trauma 1993; 21.

This does decrease its holding power, because the thread depth is smaller. The decrease in holding strength may be theoretically compensated for by decreasing the thread pitch (increasing the number of threads per inch). This can be determined by the given formulae. Clinically, cannulated screws appear to function well and in a practical sense may have more than adequate holding power. When comparing the holding power of different cannulated screws, the surgeon may apply the principles given in making his choice of the appropriate device.

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Cannulated Screw Fixation: Principles and Operative Techniques by Jens J. Ernberg, Stanley E. Asnis (auth.), Stanley E. Asnis M.D., Richard F. Kyle M.D. (eds.)

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