The therapeutical applications of hydrozone and glycozone . becomes a powerful internalrotator and increases inpower as the limb flexes,as does the tensor vaginaefemoris (see Fig. 11): theoutward rotators becomeabductors when the limb isflexed to an angle of aboutforty degrees, with the ex-ception of the quadratusfemoris and obturator ex-ternus. The change ofaction in the other musclesis quite as marked as inthese which have beenillustrated and presented asexamples. (See Figs. 10and 11.) This brings usto a consideration of theproblem before us. Question 1. Why inthe first stage is the limbslig
The therapeutical applications of hydrozone and glycozone . becomes a powerful internalrotator and increases inpower as the limb flexes,as does the tensor vaginaefemoris (see Fig. 11): theoutward rotators becomeabductors when the limb isflexed to an angle of aboutforty degrees, with the ex-ception of the quadratusfemoris and obturator ex-ternus. The change ofaction in the other musclesis quite as marked as inthese which have beenillustrated and presented asexamples. (See Figs. 10and 11.) This brings usto a consideration of theproblem before us. Question 1. Why inthe first stage is the limbslightly abducted, out-wardly rotated, and flexedwith apparent lengthening?Answer. Because of a voluntary effort on the part of the patient to relievetensions of the capsule and Y-ligament. (See Fig. 6.) Question 2. Why does this deformity increase, constituting the second stage ofthe disease ? Answer. Spasm of the muscles about the hip-joint is present. The great glutei,outward rotators, tensor vaginas femoris, and flexors acting together have the advantage. 44 of leverage and strength (being irritated and affected by spasm, and aided by a voluntaryeffort, or non-resisting effort of the patient, the same as in the first stage) the limb stillexaggerates the deformity of the first stage. Question3. Asa rule, with an occasional exception, why do limbs assume thedeformity of the third stage only after flexion to twenty-five degrees has taken place ? Answer. Because after the limb passed to twenty-five degrees of flexion, theabductors to a very great extent become internal rotators (see Figs. 8, 9, 10, n); theexternal rotators almost totally lose their power as external rotators (see Fig. 11), andbecome abductors, with the exception of the quadratus femoris and obturator externus,and the tensor vaginae femoris becomes a powerful inward rotator. Resistance or an-
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