How do I no if I need back surgery from herniated disc?

Ortho. A decision for or against disc surgery needs to be reached by an orthopedic specialist, after a thorough review and examination. Pros and cons need to be discussed with you so an informed decision can be reached.
Radiculopathy. After the seven weeks of pt and you have persistent leg pain and weakness with sensory loss in the right pattern you are getting closer. Seven weeks of pt is not long but you can try injections to the spine as well. The need for back surgery depends more on the weakness and other findings than the pain. People who suffer from leg pain from the disk do better than those with back pain alone.