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Case of the Day
Bilateral L4 spondylolysis
Contributed by Tariq Walizai
Incidental bilateral L4 spondylolysis with established non-union is most likely due to repetitive microtrauma. Sacralization of L5 makes L4/5 the most distal mobile level and predisposes to L4 spondylolysis. This reduces posterior support at this level and increases shearing forces on the L4/5 disc, causing premature disc degeneration, disc narrowing…
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