When is a microdiskectomy absolutely necessary and not an electice procedure?

Fail nonop care. After 3 months failing non op care like pt meds epidural injections and pain level and/or neurologic exam indicates reason for surgery. Only 10% need surgery.
Weakness. Urgent surgery can be recommended for a herniated disc that has caused progressive weakness such as a foot drop or cauda equina syndrome which includes lower extremity weakness and bowel and bladder dysfunction.