[Illustration: FIG. 115.--Advanced Tuberculous Disease of Left Hip-joint in a girl æt. 14, showing flexion, adduction, shortening, and iliac abscess.] In cases of long standing, beginning in childhood, the shortening is still further added to by deficient growth in length of the femur, and it may be of all the bones of the limb; even the foot is smaller on the affected side. The most reasonable explanation of the attitudes assumed in hip disease is that given by König. If the patient walks without crutches, as he is usually able to do at an early stage of the disease, the attitude of abduction, eversion, and slight flexion enables him to save the limb to the utmost extent; on the other hand, if he uses a crutch, as he is obliged to do at a more advanced stage, he no longer uses the limb for support, and therefore draws it upwards and medially into the position of adduction, inversion, and greater flexion. Similarly, if he is confined to bed, he lies on the sound side, and the affected limb sinks by gravity so as to lie over the normal one in the position of adduction, inversion, and flexion. König's explanation accords with the fact that in the exceptional cases which begin with adduction and inversion we have usually to deal with a severe type of the disease, associated with grave osseous lesions--precisely those cases in which the patient is compelled from the outset to lie up or to adopt the use of crutches. Further, the transition from the abducted to the adducted position usually follows upon such an aggravation of the symptoms that the patient is no longer able to walk without the assistance of a crutch. During the third stage the other signs and symptoms become more pronounced; the patient looks ill and thin, he is usually unable to leave his bed, his sleep is disturbed by startings of the limb, and the rigidity of the joint and the wasting of the muscles are well marked. The temperature may rise slightly after examination of the limb, or after a railway journey. #Abscess Formation in Hip Disease.#--The formation of abscess is not related to any stage of the disease; it may occur before there is deformity, and it may be deferred until the disease is apparently cured. Its importance lies in the fact that if a mixed infection with pyogenic organisms occurs, the gravity of the condition is greatly increased.