Spondylolysis & Spondylolisthesis: Pathogenesis and Clinical Findings



Pars interarticularis stress fracture (spondylolysis) - most frequently in the most stressed vertebrae, L5-S1

=> Weakened stability of lumbosacral joint

=> Forward slippage of vertebral body (spondylolisthesis)

 • Lumbosacral tenderness

 • Positive one-legged hyperextension test (Stork test)

 • XR — scotty dog sign on oblique view of vertebrae

 • CT - collar appearance of vertebrae

 • Shortened stride length due to tight hamstrings

 • Scoliosis



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