A treatise on orthopedic surgery . faces so that the atrophied head of the humerus may be dis-placed forward or backward; but there is not often fixed dis-placement, and consequently persistent distortion due to thiscause is unusual. Paralysis of the muscles of the forearm and of the hand isfollowed after a time by deformity of the fingers, caused pri-marily by unopposed muscular action, secondarily by accom-modation and atrophy. Deformities of the Neck.—Paralysis of one or more of themuscles of the neck may induce a paralytic torticollis. Thisis, however, uncommon. Deformities of the Trunk.—P
A treatise on orthopedic surgery . faces so that the atrophied head of the humerus may be dis-placed forward or backward; but there is not often fixed dis-placement, and consequently persistent distortion due to thiscause is unusual. Paralysis of the muscles of the forearm and of the hand isfollowed after a time by deformity of the fingers, caused pri-marily by unopposed muscular action, secondarily by accom-modation and atrophy. Deformities of the Neck.—Paralysis of one or more of themuscles of the neck may induce a paralytic torticollis. Thisis, however, uncommon. Deformities of the Trunk.—Paralysis of the muscles of thetrunk mav induce distortion and extreme lateral curvature of 634 OBTHOPEDIC SUEGEEY. the spine. This curvature is not usually caused, as might atfirst appear, by contraction of the active muscles and thus abending of the trunk with a convexity toward the weaker a rule, the curvature is, as a whole, in the opposite direc-tion. This is explained by the fact that if the paralysis is Fig. Anterior poliomyelitis, causing genu recurvatum. (See Fig. 421.) limited to one side and is extensive enough to cause distortionof the trunk, the muscles of respiration being involved, the chestwall becomes inactive and collapses. In compensation the oppo-site side of the thorax increases in volume and lung capacityand the weak, atrophied, and sunken side is drawn toward same effect is observed when the arm and the shoulder DISEASES OF THE NEEVOUS SYSTEM. 635 muscles are paralyzed, the spine bending toward the side thatis still active. Paralysis of the posterior group of nmscles, if extreme, mayinduce kyphosis. Paralysis of the muscles of the abdomen maycause lordosis, but in this group of cases the lower extremitiesare usually involved, and the secondary distortions due to pos-ture and to functional use mask the direct effect of the paraly-sis of the muscles of the trunk. And, again, the overuse of thearm muscles in patients whose lower extre
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Keywords: ., bookauthorwhitmanr, bookcentury1900, bookdecade1910, bookyear1910
