A treatise on orthopedic surgery . Normal femur from same subject. (Freiberg.) weight and strain are for any reason transferred to another part,its structure is strengthened there, and correspondingly weak-ened at the point from which the strain has been this change in the internal structure a change in the ex-ternal contour keeps pace. For, according to this theory, theexternal contour represents mathematically simply the last curveuniting the ends of the various trajectories which make up theinternal 242 OBTEOPEDIC SUEGEB¥. For the further exposition of this theory
A treatise on orthopedic surgery . Normal femur from same subject. (Freiberg.) weight and strain are for any reason transferred to another part,its structure is strengthened there, and correspondingly weak-ened at the point from which the strain has been this change in the internal structure a change in the ex-ternal contour keeps pace. For, according to this theory, theexternal contour represents mathematically simply the last curveuniting the ends of the various trajectories which make up theinternal 242 OBTEOPEDIC SUEGEB¥. For the further exposition of this theory I quote from Frei-bergs-^ review and abstract of Wolffs^ final article. In showing that improper static demands made upon anextremity resulted in the formation of new masses of bone uponthe surface of the bone of this extremity, or that they producethe disappearance (atrophy) of bone masses according to thenature and degree of these disturbances in static requirements, Fig. Section of femoral head of a paralytic idiot, aged thirty-five years, showing theextreme atrophy caused by disuse. (R. T. Taylor.) it has at once been shown in what manner deformities have theirorigin. For these transformations on the surface of bone arenothing other than deformities in the wider or narrower senseof the term. Taking genu valgum or habitual scoliosis as an example, thedevelopment of a deformity in the narrow sense is thus ex-plained. In the beginning of either of these conditions the shapeof the bones is perfectly normal. As the result of excessivefatigue in their too weak muscles the patients are frequentlyassuming a faulty position of limb or body; they seek to controlexcessive excursions of their joints by the interference of thearticular structures themselves instead of by muscular result is a continual alteration in the static requirementsmade upon the bones and the internal architecture; internal and ^Annals of Surgery, July, 1897; and American Journ
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