Today’s case is a 2 year old male neutered domestic short hair cat with an acute onset of lameness. Post your findings in the comments.
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 frog-leg 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.
- Left sided 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.
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.
- Craig LE. Physeal Dysplasia with Slipped Capital Femoral Epiphysis in 13 Cats. Vet Pathol 2001;38:92-97.
- McNicholas WT Jr., Wilkens BE, Blevins WE, et al. Spontaneous femoral capital physeal fractures in adult cats: 26 cases (1996-2001). Journal of the American Veterinary Medical Association 2002;221:1731-1736.
- Queen J, Bennett D, Carmichael S, et al. Femoral neck metaphyseal osteopathy in the cat. Veteribary Record 1998:159-162.