By Docteur Paul G. J. Maquet (auth.)
Dr. MAQUET, the main disciple of Professor PAUWELS' and the orthopae dic inheritor to the PAUWELS' innovations of osteotomy of the hip for arthritis, has assembled during this one ebook the most powerful and so much lucid modern assertion of the foundations and perform of this vitally important college of hip surgical procedure. Professor PAUWELS' contributions to the certainty of the biomechanics of the hip and to the strategies and execution of osteotomy of the hip for arthritis are extraordinary and undying. With readability, Dr. MAQUET articulates this place and refines it extra within the mild of his personal investiga tion. whereas different investigators, in fact, range on person recommendations or princi ples during this ebook or disagree with particular positions, assumptions, or conclu sions, it's transparent to all that this ebook is a benchmark paintings. Dr. MAQUET, as Professor PAUWELS continuously did, illustrates his textual content lavishly with appealing examples of person situations illuminating the foundations advert vanced. but additionally, he has long gone extra and offers long term follow-up facts, quantifying the result of those surgical precepts as skilled in his personal perform. it's a paintings that has been lengthy sought and is richly obtained. Boston, Massachusetts, 1984 WILLIAM H. HARRIS, M.D.
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Additional resources for Biomechanics of the Hip: As Applied to Osteoarthritis and Related Conditions
Subchondral sclerosis of even width throughout in the roof of the acetabulum of a normal hip corresponds to an even distribution of the compressive stresses over the weight-bearing surface of the joint (Figs. 25 and 38). Such an even distribution of the compressive stresses in a spherical joint requires: 1. The action of the transmitted force at the centre of the weight-bearing surface 2. The presence of cartilage 3. Probably a slight incongruence between the articulating surfaces in the non-loaded state Fig.
The compressive stresses are negative (- 0" y). Their distribution curve lies beneath the axis of the abscissa. The magnitude of the stresses is given in isochromatic fringe orders. Using kg/cm 2 or any other force/ surface unit would be meaningless, since the data thus calculated pertain to the plane model only. They cannot be applied as such to the three-dimensional femoral neck. They must be multiplied by an appropriate factor to give an idea of the actual order of magnitude of the stresses in the upper end of the human femur.
Progressive displacement of the centre of the initial femoral head laterally, with consequent lateral displacement of the resultant force R. (After PAUWELS 1976) 40 Fig. 43. Increase in. the articular contact surface area ; decrease in the weight-bearing area; increase in the stresses. r, radius ; R, resultant of the forces acting on the hip. (After PAUWELS 1976) joint can increase considerably due to the remodelling, but the weight-bearing area progressively decreases and the articular compressive stresses thus increase (Fig.