By Docteur Paul G. J. Maquet (auth.)
Dr. MAQUET, the main disciple of Professor PAUWELS' and the orthopae dic inheritor to the PAUWELS' techniques of osteotomy of the hip for arthritis, has assembled during this one e-book the most powerful and such a lot lucid modern assertion of the rules and perform of this vitally important institution of hip surgical procedure. Professor PAUWELS' contributions to the certainty of the biomechanics of the hip and to the suggestions and execution of osteotomy of the hip for arthritis are remarkable and undying. With readability, Dr. MAQUET articulates this place and refines it additional within the gentle of his personal investiga tion. whereas different investigators, after all, fluctuate on person recommendations or princi ples during this e-book or disagree with particular positions, assumptions, or conclu sions, it truly is transparent to all that this e-book is a benchmark paintings. Dr. MAQUET, as Professor PAUWELS continually did, illustrates his textual content lavishly with attractive examples of person situations illuminating the rules advert vanced. but also, he has long past additional 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 info for Biomechanics of the Hip: As Applied to Osteoarthritis and Related Conditions
Example text
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. 2P sin 2P Fig. 18. Pattern of isochromatics Fig. 19. Pattern of isopachics 19 Fig.
32 b). The core is the central part of the column delineated by k k in the diagram. If the load acts exactly at the right limit of the core, the maximum compressive stresses arise at the right margin of the column and are twice as great as when the load acts at 100kp o 100kp the centre of the column. They are 0 at the left margin of the column (Fig. 32c). If the load acts outside the core of the column, to the right side, the maximum compressive stresses are higher at the right margin of the column and tensile stresses arise in the left aspect of the column with the maximum at the left margin (Fig.
Moreover, the line of action of R passing through X and the centre of the femoral head becomes more inclined to the vertical. This displaces X K x K D~ c Fig. 28. a Normal hip. b Coxa vara. c Coxa valga. S5' centre of gravity of the mass of the body supported by the hip; K, force exerted by this mass; M, force exerted by the abductor muscles; h, lever arm of force M; h', lever arm of force K; X, intersection of the lines of action of forces K and M; R, resultant of forces K and M; S, shearing component of force R; D, compression; Z, tension.