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Download PDF by Jens J. Ernberg, Stanley E. Asnis (auth.), Stanley E. Asnis: Cannulated Screw Fixation: Principles and Operative

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 variety to supply either the biomechanics of those screw platforms in addition to entire operative recommendations. This booklet teaches the orthopaedic medical professional and resident all elements of cannulated screw fixation from rules (biomechanics, layout, fabrics, production) to medical makes use of together with anatomy, imaging ideas, benefits, problems and results. This complete textual content comprises chapters written by way of recognized orthopaedists of their respective anatomical parts with fabric on most well liked working options and makes use of in additional really good medical events for either top and decrease extremities. Edited through 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

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Chapman 19 :? 5. An experimentally derived relationship between the torsional strength of bone screws and the cube of their root diameters. (Reprinted with permission from Hughes and Jordan. 6, results in a variation of +10%, -14% in the cube of the cross-sectional area, and ultimate torsional strength. 4 results in an estimated variability in the torsional strength of ±24 %. These larger variations are the result of the tolerances on both the root diameter and the cannula itself. However, the larger root diameter of a cannulated screw accommodates this larger potential variability since for equivalent sizes it is considerably stronger than a solid cancellous screw, as discussed above.

Z-g -0. wo. (1)10 oCt I- w ...... J Q. Q. Q. 0 0 a: e( :I: 0 ::E ::J cW 0 l- u.. J 0 Q. 20. Mean percent decreases in screw pullout strength in porous materials as well as cancellous bone due to tapping holes before insertion of screws compared with not tapping (adapted from Chapman et aIY). 30 2. Biomechanics of Cannulated and Noncannulated Screws w ~ o 80r-------------------------------------------------, J: ==W~ a:!?... u- enal 60 ~~ w-1"11c en «g w_ a:-c za. - a. I 0 D.. D.. 0 :;; a:: « J: ::;) 0 w :;; J: w 0 D..

13. Two different mechanisms of fail- ure in screw pullout. (a) Failure at the bone/ screw thread interface with shearing of bone. A cylinder of bone is carried within the threads. (b) Failure of bone, typically in cortex. F. E. M. R. Chapman 25 2,000 e. r:. 0> c ~ en "5 1,000 g :J a.. 14. Relationship of screw pullout strength to bone density in vertebral bodies. (Reprinted with permission from Trader et a1. 65). , increased difference between screw major and minor diameters) and pitch becomes smaller.

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