Severe spine and knee pain 10 months after ceasarian section. Is this normal? Many thanks.

No. If this isn't something you have already discussed with your ob/gyn you should definitely consult with him/her. He/she may recommend you see a spine specialist to further investigate the cause of your pain and recommend options for treating it.
No. The pain you describe is not normal. While postpartum back pain may persist, it usually is not a long term problem the knee pain would be unrelated to the pregnancy.