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TNS



Transient neurologic symptoms (TNS) is a syndrome of pain/dysesthesia in the lower back, posterior thighs, or buttocks that generally occurs within 24 hours of recovery from a spinal anesthetic. 

Full recovery from the symptoms most often occurs within 3 days. Importantly, TNS is not associated with sensory loss, motor weakness, or bowel or bladder dysfunction.

 Risk factors for TNS following spinal anesthesia include the use of lidocaine, lithotomy position during surgery, and outpatient status. Indeed, when these three risk factors are combined, the incidence rate has been found to be 24%. Similar to lithotomy, positioning for knee arthroscopy appears to dramatically increase risk. 

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