SACRAL ARTICULATION WITH L5 (need FSL to differentiate):

L4 on L5 is the most common level. Acute pars defect=spondylolytic spondylolisthesis. 3 F’s ( Female, Forties, L4 (most common occurrence for Spondylo) Retrolisthesis ( Not part of Wilste classification. Due to DDD ( narrowing causes facet dislocation / subluxation = … ................
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