By George L. Lucas M.D., Francis W. Cooke Ph.D., Elizabeth A. Friis Ph.D. (auth.)
A PRIMER OF BIOMECHANICS is the 1st quantity of its sort to offer the rules of biomechanics with a hugely scientific orientation. Dr. Lucas and his colleagues (specialists in biomechanics) have assembled a realistic consultant using case shows to make this very technical and complex fabric palatable to the orthopaedic resident and practitioner. This "user-friendly" textual content is extra better by means of good built-in chapters protecting the entire simple fabrics and the newest details of this quickly evolving box from the point of view of its invaluable program. each one case presentation is via an in depth, yet simply comprehensible rationalization of the biomechanical ideas concerned and contains protocols for remedy. This quantity is a must have for orthopaedic citizens and practitioners.
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4. (a) The arm bent at 90° at the elbow, with the wrist and fingers held rigid and a weight of 15 kg held on the palm. (b) The freebody diagram of the forearm holding the weight. Figure 2Ab is a free-body diagram of his forearm , in which the anatomical structures are represented by a simple beam extending from the elbow to the fingers. The wrist, hand, and finger joints are rigidly fixed. All the forces acting on the free body are shown, including the joint reaction force J R , acting between the ulna and the humerus.
3 HIP FORCES By now it should be clear that care in the selection of coordinate systems and in the preparation of free-body diagram s as well as orderliness in the execution of calculations can greatly decrease the burden of biomechanical analyses. Furthermore, the calculations, when completed, can give surprisingly powerful insights into the mechanics of the musculoskeletal system. One of the best examples of this capability can be seen in the analysis of forces acting across the hip. , in their textbook Orthopaedic Biomechanics, published in 1970.
7. A spec imen of the same original length and material will deform only one-ha lf as much if the cross-sect ional area is doubled. men, one now finds that the specimen with twice the cross-sectional area experiences only half the deformation of the other specimen. 8), one finds that force is no longer proportional to strain for specimens of the same material and length with different cross-section al areas. Therefore, in order to characterize a materia l properly regardless of the size or shape of the specimen, the applied force must be normalized to the original cross-sectio nal area.
A Primer of Biomechanics by George L. Lucas M.D., Francis W. Cooke Ph.D., Elizabeth A. Friis Ph.D. (auth.)