The configuration and tight fit of these bones is what substitutes for the ligaments in providing stability, thereby preventing side-to-side movement or dislocation of the bones in this region.
Dislocation in this region requires rapid realignment, as untreated perilunate dislocation or dislocation of the lunate bone will lead to serious secondary damage, which can only be treated by salvage operations involving loss of function [10].
Phelps cited Cornigan who "believed that the dislocation was a primary one, due to reflex spasm of the muscles in utero, caused by some central nerve lesion in early fœtal life [1]." In referring to his case, he then remarked, "It seems to me that dislocation of this bone could not take place by the contraction of...muscles... ........ based on the directions of muscle pull.
It seems to me that dislocation of this bone could not take place by the contraction of these muscles, but, on the contrary, that contraction of the glutei muscles, or of any of these groups, would tend to press the head of the bone more firmly into the acetabulum.
This, I apprehend, may be the reason why there is so often a tendency to dislocation of the thigh-bone in hip-joint disease at an early period of life.
The distal part of the femoral bone was brought separately to the ER Open image in new window Fig. 2 Computed tomography (CT) angiography demonstrates a complete dislocation of the left hip, segmental bone defect of approximately 26 cm of the distal femoral bone without signs of injury to the popliteal artery Open image in new window Fig. 3 Clinical and radiological findings 6 weeks after injury.
Mice were killed by cervical dislocation; soft X-ray images of the bone tumors were obtained to evaluate antitumoral effects.
Correction of orbitotemporal neurofibromatosis with dystopia involves three steps: removal of the mass in the orbit to eliminate the effect of downward dislocation of the orbit, placement of a bone graft in the orbit floor after repositioning the orbit for suspension and remodeling of the orbit, and following the correction of dystopia, ptosis may be corrected if needed.
Some two years ago Dr. John Ridlon, of New York, reported a case of congenital dislocation of the hip, the head of the bone resting on the pubes.
Criteria for a bone fracture on (multidetector) CT images are the presence of a sharp lucent line within the trabecular bone pattern, a break in the continuity of the cortex, a sharp step in the cortex, or a dislocation of bone fragments.
