Can sciatica in the legs be cured?

Yes and most of the : Time without surgery! 90% with sciatica due to a disc herniation get better without surgery independent of any specific treatment as time is the biggest healer. Treatment also can include: medication, injections, activity modification, physical therapy, acupuncture and chiropractic. For those that have indicated surgery, the success is 90-95% as long as one is not a smoker or morbidly obese.

Sciatic pain: The sciatic pain can be caused by spinal stenosis, nerve impingement ... Most sciatica pain will improve with time, exercise, and physical therapy. If your pain persists, other treatment might include medication, injections, weight management, acupuncture and chiropractic. If you fail all of these treatment, surgical evaluation is beneficial.

Cure, Unlikely...: Sciatica can be managed effectively and can be relieved in a vast majority of people, but it will always require diligence on your part for nsaids, exercise, stretching and weight control/loss. For those still having issues it may require treatments (injections, surgery, etc) to maintain relief as well.