Surgical stabilization of an occipitoatlantoaxial malformation in an adult dog.

OBJECTIVE

To report surgical planning, technique, and outcome of stabilization surgery in an adult dog with occipitoatlantoaxial malformation (OAAM).

STUDY DESIGN

Clinical report.

ANIMAL

A 19-month-old, 25.5 kg, male castrated, Shiba Inu.

METHODS

Radiographic and magnetic resonance imaging were used to identify and characterize OAAM. Using a ventral approach to the cranial cervical region 2 cortical bone screws were inserted from the axis into the malformed atlas and occiput.

RESULTS

Ambulation was conserved postoperatively. Within 4 weeks, neurologic examination was mostly normal except for decreased proprioception in the right pelvic limb. At 9 months, the dog retained an extended neck posture, but had no neurologic abnormalities.

CONCLUSION

OAAM should be considered as a differential diagnosis in an adult dog with cervical myelopathy. Surgical fixation with cortical bone screws using a ventral approach can be successful.