Low back pain with extension and rotation of the lumbar spine.
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CT shows bilateral L4 and unilateral L5 pars interarticularis defects.
Spondylolysis is believed to be caused by repeated microtrauma, resulting in stress fracture of the pars interarticularis. Genetics are also believed to be a factor. It is more common in men than in women1.
- 1. Jinkins JR, Matthes JC, Sener RN et-al. Spondylolysis, spondylolisthesis, and associated nerve root entrapment in the lumbosacral spine: MR evaluation. AJR Am J Roentgenol. 1992;159 (4): 799-803. AJR Am J Roentgenol (abstract) - Pubmed citation