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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. An abscess may appear _in the thigh_ in front or behind the joint. The _anterior abscess_ emerges on one or other side of the psoas muscle; from the resistance offered by the fascia lata, the pus may gravitate down the thigh before perforating the fascia. It has occasionally happened that when such an abscess has been opened and become infected with pyogenic organisms, the femoral vessels have been eroded, and serious or even fatal haemorrhage has resulted. The _posterior abscess_ appears in the buttock and may make its way to the surface through the gluteus maximus; more often it points at the lower border of this muscle in the region of the great trochanter, or it may gravitate down the thigh. Abscesses which form _within the pelvis_ originate either in connection with the acetabulum or in relation to the psoas muscle where it passes in front of the joint. Those that are directly connected with disease of the acetabulum may remain localised to the lateral wall of the pelvis, or may spread backwards towards the hollow of the sacrum. They may open into the bladder or rectum, or may ascend into the iliac fossa and point above Poupart's ligament (Fig. 115), or descend towards the ischio-rectal fossa. The abscess which develops in relation to the psoas muscle may be shaped like an hour-glass, one sac occupying the iliac fossa, the other filling up S
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