Hello, Back pain radiating in a limb suggests compression of one of the nerve roots exiting the spinal column. The most common cause for the compression is disc herniation, displacement of one of the cartilage discs located between the vertebrae. Chronic changes to the vertebrae with formation of osteophytes, bony spurs, compression the nerve root are another cause. The best means to diagnose it is a neurological physical exam and a lumbar MRI, I would start with a neurological consult. Most cases improve gradually, but it may be a recurring issue, as our columns continue to age with the passing of the years often it is difficult to get rid of it permanently. Physical therapy is important to prevent recurrences. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Olsi Taka, Neurologist