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Vet Comp Orthop Traumatol 2015; 28(04): 256-262
DOI: 10.3415/VCOT-15-01-0008
Original Research
Schattauer GmbH

Influence of two types of self-retaining retractors on multifidus muscle blood flow during dorso lateral thoracolumbar hemilaminectomy in dogs

D. Rohner
1   Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
,
S. Forterre
1   Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
,
H. Rohrbach
2   Division of Anesthesia, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
,
A. Bürki
3   MEM Research Center, Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland
,
D. Gorgas
4   Division of Radiology, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
,
J. Howard
5   Clinical Pathology Division, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
,
F. Forterre
1   Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
› Author Affiliations
Further Information

Publication History

Received:12 January 2015

Accepted:25 April 2015

Publication Date:
28 December 2017 (online)

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Summary

Objectives: To assess the influence of the use of Gelpi and Grevel retractors on multifidus muscle blood flow during hemilaminectomy, using a dorsolateral approach, for acute disc extrusion in dogs as measured by laser speckle contrast imaging (LSCI).

Methods: Blood flow in the multifidus muscles was measured intra-operatively using LSCI prior to insertion of the retractors, immediately after hemilaminectomy and removal of the retractors, and after 10 minutes of lavage of the surgical site. Plasma creatine kinase levels were measured preoperatively and 12–24 hours postoperatively.

Results: Muscular blood flow was significantly decreased following retraction and remained lower than initial values 10 minutes after lavage in all dogs. The decrease in blood flow was significantly greater with Gelpi re-tractors (n = 8) than with Grevel retractors (n = 10). No significant relation was found between the duration of retraction and postoperative changes in creatine kinase levels or blood flow.

Clinical significance: Findings in this study demonstrate a drop in blood flow within the multifidus muscles using the dorsolateral approach regardless of retractor type used. Gelpi retractors seem to have greater influence on muscular blood flow than Grevel retractors. Further studies are warranted to confirm this second finding.

Keywords

Self-retaining retractors - thoracolumbar disc extrusion - multifidus muscle - blood flow - dog
 

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