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Incidence of Spinal Compressive Lesions in Chondrodystrophic Dogs with Abnormal Recovery after Hemilaminectomy for Treatment of Thoracolumbar Disc Disease: A Prospective Magnetic Resonance Imaging Study

Authors

  • FRANCK FORTERRE DVM, Diplomate ECVS,

    1. Small Animal Clinic, Divisions of Surgery, Radiology and Neurology, Vetsuisse Faculty, University of Berne, Berne, Switzerland.
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  • DANIELA GORGAS DVM, Diplomate ECVDI,

    1. Small Animal Clinic, Divisions of Surgery, Radiology and Neurology, Vetsuisse Faculty, University of Berne, Berne, Switzerland.
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  • MARK DICKOMEIT DVM,

    1. Small Animal Clinic, Divisions of Surgery, Radiology and Neurology, Vetsuisse Faculty, University of Berne, Berne, Switzerland.
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  • ANDRE JAGGY DVM, Diplomate ECVN,

    1. Small Animal Clinic, Divisions of Surgery, Radiology and Neurology, Vetsuisse Faculty, University of Berne, Berne, Switzerland.
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  • JOHANN LANG DVM, Diplomate ECVDI,

    1. Small Animal Clinic, Divisions of Surgery, Radiology and Neurology, Vetsuisse Faculty, University of Berne, Berne, Switzerland.
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    • *Contributed equally.

  • DAVID SPRENG DVM, Diplomate ECVS & ACVECC

    1. Small Animal Clinic, Divisions of Surgery, Radiology and Neurology, Vetsuisse Faculty, University of Berne, Berne, Switzerland.
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    • *Contributed equally.


Corresponding author: Dr. Franck Forterre, DVM, Diplomate ECVS, Small Animal Clinic, Division of Surgery, Vetsuisse Faculty, University of Berne, Länggasse 128, Postfach, CH-3001 Berne, Switzerland. E-mail: frank.forterre@kkh.unibe.ch.

Abstract

Objective— To investigate causes of the lack of clinical improvement after thoracolumbar disc surgery.

Study Design— Case–control magnetic resonance imaging (MRI) study.

Animals— Chondrodystrophic dogs with acute thoracolumbar disc disease treated by hemilaminectomy: 10 that had no short-term clinical improvement and 12 with “normal” clinical improvement.

Methods— Dogs that had surgery for treatment of intervertebral disc extrusion (2003–2008) where thoracolumbar disc disease was confirmed by MRI were evaluated to identify dogs that had lack of clinical improvement after surgery. Ten dogs with delayed recovery or clinical deterioration were reexamined with MRI and compared with 12 dogs with normal recovery and MRI reexamination after 6 weeks (control group).

Results— Of 173 dogs, 10 (5.8%) had clinical deterioration within 1–10 days after surgery. In 8 dogs, residual spinal cord compression was identified on MRI. Bleeding was present in 1 dog. In 3 dogs, the cause was an incorrect approach and insufficient disc material removal. In 3 dogs, recurrence occurred at the surgical site. In 1 dog, the centrally located extruded material was shifted to the contralateral side during surgery. These 8 dogs had repeat surgery and recovery was uneventful. In 2 dogs, deterioration could not be associated with a compressive disc lesion. Hemorrhagic myelomalacia was confirmed by pathologic examination in 1 dog. The other dog recovered after 6 months of conservative management.

Conclusion— Delayed postsurgical recovery or deterioration is commonly associated with newly developed and/or remaining compressive disc lesion.

Clinical Relevance— We recommend early MRI reexamination to assess the postsurgical spinal canal and cord, and to plan further therapeutic measures in chondrodystrophic dogs with delayed recovery after decompressive hemilaminectomy for thoracolumbar disc disease.

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