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New PDF release: ¿Quién vive en el mar? (Who Lives In the Sea?)

By Cambridge

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Additional resources for ¿Quién vive en el mar? (Who Lives In the Sea?)

Sample text

The compression exerted by a lag screw is very efficient because (among other reasons) it is relatively large. Brennwald et al. 3 Scientific Background to Internal Fixation \ b Fig. 14a-c. Principles of lag screw technique. a In order to find the best location and inclination, forceps compressing the fracture temporarily substitute for the function of the lag screw. They are also adjusted to prevent shear of the fracture. b The lag screw replaces the forceps in location and position (inclination) for best stabilization.

C Remodeling of the necrotic area progressing towards the nail. d The rate and direction of the remodeling process were determined using the polychrome sequential labeling method (Rahn eta!. 1980). 4 Direct (or Primary) Bone Healing Direct bone healing bypasses the different steps outlined for indirect healing and proceeds directly to internal remodeling (Fig. 38) in contact zones (contact healing) (Fig. 38a) or to filling of stable gaps with lamellar bone and consequent remodeling or plugging (gap healing; Fig.

Stable, Compressed Interface. Screws submitted to bending and thus stabilized by compression (at the interface) were studied in the same experiment in which unstable interfaces were examined. Less bone surface resorption was observed. It is important to note that in this experiment, in spite of very high internal compressive stresses, the bone did not show resorption in the stable areas of contacting interface. 27 explains the relationship between compression applied and fracture surface resorption: maintenance of compression proves the absence of such resorption.

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¿Quién vive en el mar? (Who Lives In the Sea?) by Cambridge


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