hi, thank you for providing the brief history of you. As I was going through the history of you, I can understand that you had a lumbar spine fusion in the past. Your other all parameters are normal. Since you had the surgery of fusion of the spine in the past, there will be a mild compression of the nerve by which you are getting this symptoms if tingling and numbness. This is called lumbar radiculopathy. Based on my clinical experience some patients have this kind of sensation in the legs post lumbar spine fusion. For which a physical therapy is recommended. As by performing the exercises for strengthening the core, pelvic floor, spinal muscles and lower limb muscles helps to reduce the symptoms and eliminate as well. As post lumbar spinal fusion, there is a change in the biomechanics of the spine as well as the muscles of the spine too. For which the rehabilitation of the spine is a must to avoid any recurring symptoms which were the priority for undergoing surgery. Also, that you have to give your 100% to rehabilitate the spine now as to avoid the future symptoms again. I have found 99% of success in my clinical experience. & the symptoms are due to muscle spasm for which initially the therapeutic ultrasound therapy and TENS therapy have helped a lot. Later stages a good spine rehabilitation protocol is implemented since you have surgery performed the protocol will be differences to get the torque in the muscles to the optimum. I wish and hope to see you recovered soon. Regards Jay Indravadan Patel