By Margareta Nordin, Victor Frankel
Now in its Fourth variation, Basic Biomechanics of the Musculoskeletal System uses a right away and complete method of current scholars with a operating wisdom of biomechanical ideas of use within the evaluate and remedy of musculoskeletal disorder. The textual content opens with a bankruptcy that introduces the elemental terminology and ideas of biomechanics; the rest of the e-book then makes a speciality of the biomechanics of tissues and buildings, the biomechanics of joints, and utilized biomechanics.
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Additional info for Basic Biomechanics of the Musculoskeletal System
Because the magnitude of the bending moment is the same throughout the area between the two force couples, the structure breaks at its weakest point. An example of a four-point bending fracture is shown in Case Study 2-1. 17/10/11 17/ 7/10/11 0/11 10:52 PM 0/ CHAPTER 2 ● BIOMECHANICS OF BONE 39 Case Study 2-1 Bone F B Failure il A stiff knee joint was manipulated incorrectly during rehabilitation of a patient with a postsurgical infected femoral fracture. During the manipulation, the posterior knee joint capsule and tibia formed one force couple and the femoral head and hip joint capsule formed the other.
Figure 2-11 depicts typical stress-strain qualities of cortical and trabecular bone with different bone densities tested under similar conditions. In general, it is not enough to describe bone strength with a single number. It is better to examine the stress-strain curve for the bone tissue under the circumstances tested. Schematic stress-strain curves for bone, metal, and glass are useful in illustrating the relationship between their various mechanical behaviors (Fig. 2-12). The disparities in stiffness are reﬂected in the different slopes of the curves in the elastic region.
2-15 Scanning electron photomicrograph of a human cortical bone specimen tested in compression (×30). Arrowss indicate oblique cracking of the osteons. Courtesy of Dennis R. D. 200 MPa 30 ° L Stress distinct mechanical properties when loaded along various axes because its structure differs in the transverse and longitudinal directions. Isotropic materials like metal, on the other hand, have the same properties when loaded in any direction. Figure 2-16 shows the variations in strength and stiffness for cortical bone samples from a human femoral shaft, tested in tension in four directions (Carter, 1978; Frankel and Burstein, 1970).
Basic Biomechanics of the Musculoskeletal System by Margareta Nordin, Victor Frankel