A treatise on orthopedic surgery . ence of the infantile form; in others no history of apreceding affection can be obtained.^ Adolescence when growth is rapid is a period of instabilitywhen static deformities develop or if already present are exag- ^ Drewitt, Transactions of the London Pathological Society, 1881, Glutton, St. Thomas Hospital Reports, 1884, vol. xiv. Horvritz,Am. J. Orthopedic Surgery, Nov., 1909. Emslie, St. Barth. Hosp. Reports,V. 42, 1906. 526 OBTEOPEDIC SUBGEBY. gerated particularly in subjects living under unfavorable con-ditions v^ho are overburdened or overv^^
A treatise on orthopedic surgery . ence of the infantile form; in others no history of apreceding affection can be obtained.^ Adolescence when growth is rapid is a period of instabilitywhen static deformities develop or if already present are exag- ^ Drewitt, Transactions of the London Pathological Society, 1881, Glutton, St. Thomas Hospital Reports, 1884, vol. xiv. Horvritz,Am. J. Orthopedic Surgery, Nov., 1909. Emslie, St. Barth. Hosp. Reports,V. 42, 1906. 526 OBTEOPEDIC SUBGEBY. gerated particularly in subjects living under unfavorable con-ditions v^ho are overburdened or overv^^orked. By many writers the term late rickets is improperly used toexplain genu valgum, coxa vara, and the like in subjects of thisclass althoiigh none of the distinctive sigiis of the disease arepresent. CHONDRODYSTROPHIA. Synonym.—Achondroplasia. Cases that present the signs of what appears to be severegeneral rhachitis at birth are not especially uncommon. Thetrunk seems long and the upper arms and thighs are dispro- FiG. Chondrodystrophia of slight degree, contrasted with ordinary rhachitis, insisters. 1. Chondrodystrophia. Broad, short, very flexible hands ; trunk dispro-portionately long; knock-knees. Age, five and a half years; height, SQi/o inches;normal height, 40 inches. 2. Rhachitis, bow-legs; age, four years; height Si-inches ; normal height, 36 inches. CONGENITAL AND ACQUIRED AFFECTIONS. 527 portionally short and distorted, as compared to leiigtli of thestunted limbs. The head is large. The face is flattened, thenose sunken and the skin may be thickened, the chest presentsa pigeon-like distortion, and the extremities of the bones appearto be generally enlarged. The hands and feet are short andbroad and the joints seem relaxed. In some instances the backis curved into a rigid kyphosis or scoliosis, and restricted motionor apparent fixation of many of the joints may be present.^ Etiology and Pathology.—These cases were formerly sup-posed to be instances of i
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