my husband has undergone spinal fusion with titanium cage at l4 l5 before two months as he was suffering from back pain for a year. after surgery his condition has worsened. now he experiences low back pain that moves to his hip and thighs. the pain is stabbing in nature and occurs when he moves.(like, turning while lying down, getting up, sitting down etc) when he gets up in the morning and evening his legs start to tremble for half to a minute. mri shows no nerve root impingement. please help.