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 variety to offer the foundations of biomechanics with a hugely scientific orientation. Dr. Lucas and his colleagues (specialists in biomechanics) have assembled a pragmatic advisor using case displays to make this very technical and complex fabric palatable to the orthopaedic resident and practitioner. This "user-friendly" textual content is extra superior by way of good built-in chapters masking all of the uncomplicated fabrics and the newest info of this swiftly evolving box from the viewpoint of its precious program. each one case presentation is by way of an in depth, yet simply comprehensible rationalization of the biomechanical rules concerned and comprises protocols for therapy. This quantity is a must have for orthopaedic citizens and practitioners.
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How can we calculate the amount of weight needed to keep Willie's femur aligned? 3. In general, one can assume that, in Russell's traction , the force acting to reduce the fracture is about twice the magnitude of the weights added, depending on the angle e at the foot, the angle of the sling rope at the knee, and frictional losses in the pulleys. Therefore, 5 Ib of weights will produce about 10 Ib of distraction across Willie 's fracture, which should be about right to produce a well-reduced union when healing is complete.
We are therefore forced to forego a detailed analysis of a great many factors (besides loading rate) that can influence the results in a specific case. These additional factors include age, gender, physical condition, pathology, anatomical variations, footwear, and walking surface conditions . Next, we establish a coordinate system with the x axis to the right, the y axis superior, and the z axis anterior and passing through the center of rotation of the femoral head. , we consider only abduction and adduction, another important simplifying assumption).
Ll). The diagram is somewhat of a simplification in that the leg is shown fully extended with no flexion at the knee. This simplification, however, makes the problem easier to treat at this early stage in the development of our analytical skills. 11), which supports the weight of the leg. , the distributed force where the leg contacts the mattress and at F r , where the leg contacts the rest of the body). Next, the force acting across the fracture is equal to the reaction force, F r , at the hip because all the traction forces tF, and F) are distal to the fracture (and are opposed by F r ) ; also, the line of action of F r is coincident with the axis of the femur.