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Citation:
Niknejad M, Collar sign in spondylolysis. Reference article, Radiopaedia.org (Accessed on 04 Jun 2023) https://doi.org/10.53347/rID-97074
The Collar sign in spondylolysis refers to a break in the pars interarticularis of the vertebra on oblique radiographs that can have the appearance of a collar around the Scotty dog's neck.
- unilateral or bilateral
- 90% seen at the L5 level and less than10% noted at the L4 level1,2
- 65% of patients may progress to spondylolisthesis1
- 1. Syrmou E, Tsitsopoulos P, Marinopoulos D, Tsonidis C, Anagnostopoulos I, Tsitsopoulos P. Spondylolysis: A Review and Reappraisal. Hippokratia. 2010;14(1):17-21. PMC2843565 - Pubmed
- 2. Jinkins J, Matthes J, Sener R, Venkatappan S, Rauch R. Spondylolysis, Spondylolisthesis, and Associated Nerve Root Entrapment in the Lumbosacral Spine: MR Evaluation. AJR Am J Roentgenol. 1992;159(4):799-803. doi:10.2214/ajr.159.4.1529846 - Pubmed
- 3. Dunn A, Campbell R, Mayor P, Rees D. Radiological Findings and Healing Patterns of Incomplete Stress Fractures of the Pars Interarticularis. Skeletal Radiol. 2008;37(5):443-50. doi:10.1007/s00256-008-0449-0 - Pubmed
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