Pelvis X-ray showed a normal femoral head and coxofemoral joint
and a bony spur starting from the lateral corner of the right acetabulum and lying toward the anterior part of the hip joint, which was consistent with pelvic digit (Figure 4).
A computed tomography (CT) of the coxofemoral joint showed a minimally displaced, simple closed fracture of the left femoral neck, with sclerosis of the fracture fragments.
A standard lateral approach to the avian coxofemoral joint was used.
During passive range of motion exercises, no crepitus in the coxofemoral joint was palpated, and the hawk had normal range of motion.
The next day the goose was non-weight bearing on the right leg, with palpable crepitus in the right coxofemoral joint.
Radiographic visualization of the avian coxofemoral joint is hampered by the short femoral neck and the superimposition of the femur over the pelvis, synsacrum, contralateral limb, kidneys, and digestive tract.
The red-tailed hawk described had obvious crepitus and pain isolated to the coxofemoral joint, with the minimal displacement of the fracture, preventing diagnosis based on radiographic evaluation when using routine positioning.
In both human and veterinary patients, FHO has been performed for disorders of the coxofemoral joint and femoral neck.
21) In previous reports of FHO to treat disorders of the coxofemoral joint in avian species, the affected limb was immobilized for 10 or more days after surgery, either through placement of an Ehmer sling or restricting activity.
Only lateral and ventrodorsal views that met criteria for symmetrical positioning were examined: for the ventrodorsal views, the carina and the vertebral spine were superimposed and wings were symmetrical; for the lateral views, both coxofemoral joints
were overlapped and the wings were superimposed.