<s>[INST] I am having a problem with numbness,tingling in leg and foot , mostly in back of leg, pain seems to be centered in back of knees. Yesterday my leg went completely numb and it felt like I had a ball, the size of a baseball on the top part of bottom of my foot just above the arch. I have had disc surgery before for a splasher disc ( L5S1). But it wasn t this painful. Can you help? Thank you in advance for any information you can offer. XXXX [/INST] Hello, With the history, I understand that there is muscle weakness in the lumbar spine region post surgery and needs exercises to be performed like the core stability, spinal muscle strengthening, lower limb strengthening as well. In my clinical practice, this is the least common I have seen with. But after a thorough clinical examination and assessment, they respond well to the spine rehabilitation program. Hope I have answered your query. Let me know if I can assist you further. Jay In Chat Doctor.  </s>