<prompt> When do you operate for prolapsed disc ?Busy executive needs quick surgeryOnly with weakness no painSevere pain interfering with activity and not relieved by rest and treatment of 8 weeksPatient of PID with difficulty in ambulation  <response>: Ans. is c i.e., Severe pain interfering with activity and not relieved by rest and treatment of 8 weeks Indications for surgery in cases of Prolapsed interveebral disc are :- i Failure of conservative treatment even after 8 weeks of treatment. ii Progressive neurological deficit. iii Cauda - equina syndrome. iv Severe sciatic tilt. 