see also: [[Neuro - lower limb]], [[Back pain]], [[Weakness]] see: [Dunn - Low back pain](x-devonthink-item://D33FBCC0-28BC-40C1-B234-FC21BBD34BB3) Usually due to proloapsed intervertebral disc; 90% at either L4-L5 or L5-S1 **Risk factors** - long history of lumbosacral degenerative disease - lumbosacral trauma - recent spinal surgery - anti-coagulation - cancer **Clinical features** - bilat lower extremity pain or weakness strongest predictor - urinary retention (post-void residual volume >200 mL) - \> 500 mL OR is 4 - < 50-100mL very uncommon - saddle anesthesia (loss of peri-anal sensation) - lax anal tone not very discriminating - radicular motor deficits - loss of deep tendon reflexes ![[Pasted image 20250104004706.png]] ![[Pasted image 20250104004727.png]]