The oblique view of the lumbar spine is specifically designed to visualize the pars interarticularis, which appears as the 'neck' of the 'Scottie dog' sign. A defect in the pars interarticularis (spondylolysis) is seen as a 'collar' or 'decapitation' of the Scottie dog. While lateral views show the degree of slip, and AP views are less informative for pars defects, oblique views are crucial for identifying the defect itself. Flexion-extension views are used to assess spinal stability.
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