title: Effectiveness of cervical hemilaminectomy in canine Hansen Type I and Type II disc disease: a retrospective study.
abstract: Medical records of 41 dogs, including 15 small breed dogs (<15 kg) and 26 large breed dogs (>15 kg), with cervical intervertebral disc disease (IVDD) that underwent a hemilaminectomy were reviewed. Dogs were diagnosed using myelography, computed tomography/myelography, or MRI, and dogs were classified as having either Hansen Type I disc extrusion or Hansen Type II disc protrusion located ventrally, ventrolaterally, or laterally within the cervical spinal canal. The most common clinical presentation was ambulatory tetraparesis and/or lameness (44%). The most affected sites for cervical IVDD were between the sixth and seventh cervical vertebrae (C6-C7; 78% of Hansen Type II discs) and C2-C3 (86% of Hansen Type I discs). Treatment was effective in 88% of dogs. Five large breed dogs (12%) did not improve. In dogs with a Hansen Type I disc extrusion, clinical signs improved in 96% of the cases. In dogs with a Hansen Type II disc protrusion, an excellent and good outcome was seen in 47% and 32% of cases, respectively. Outcome was significantly better for small breed dogs and dogs with Hansen Type I disc disease compared with large breed dogs and dogs with Hansen Type II disc disease.
authors.affiliation: Clinic for Small Animal Surgery/Neurology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.
authors.forename: Oliver
authors.initials: O
authors.lastname: Schmied
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Golini
authors.forename: Frank
authors.initials: F
authors.lastname: Steffen
mesh_terms: D000818:Animals; D002574:Cervical Vertebrae; D004283:Dog Diseases / Q000453:epidemiology* / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D004285:Dogs; D005260:Female; D007405:Intervertebral Disc Displacement / Q000453:epidemiology / Q000601:surgery / Q000662:veterinary*; D007796:Laminectomy / Q000706:statistics & numerical data / Q000662:veterinary*; D008279:Magnetic Resonance Imaging / Q000662:veterinary; D008297:Male; D008499:Medical Records; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013557:Switzerland / Q000453:epidemiology; D016896:Treatment Outcome