Presentation
Presents with acute onset of left hind limb lameness after coming in from outdoors.
Patient Data
There is a displaced capital physeal fracture of the left femoral head, with mild cranial displacement of the femoral neck and remainder of the femur in relation to the head on the extended VD projection. On the frogleg VD projections, there is less pronounced displacement but a step-defect between the femoral head and neck is still visible. There is disc space narrowing at L4-5 and remodeling of the adjacent endplates particularly the cranial endplate of L5. No abnormalities of the limb are identified. Most of the physes of the pelvic limbs remain at least partially open, including the intact right femoral capital physis.
Capital physeal fracture of the left pelvic limb. Delayed physeal closure of the hind end physes. Disc space narrowing and mild endplate remodeling at L4-5.
Case Discussion
This syndrome of delayed physeal closure occurs in two year old male neutered cats. They tend to be overweight, and present with spontaneous femoral capital physeal fractures. The disease is often bilateral. The physeal cartilage is often abnormal.
When radiographing these cats, it is important to take several v/d projections. In cases where the lesion is not visible on a hip extended view, it may be more obvious on a frog-leg projection.
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