Back disc L4 L5 compresed moderately to L5 nerveroot & L5 s1 mildly intending calsac s1 nerveroot. Doing PT. Can it cure? Once cured wil ths come agn?

Yes and no. Physical therapy does not "cure" the radiologic findings you are describing; but some people can come through therapy with much less pain and able to be much more active. And because the findings in the MRI are not dangerous, if anything nonoperative can be done to reduce your pain and improve your activity level that would essentially be a form of "cure."

Related Questions

Which excercises are helpfull or ok to carry out without harming myself since I have lumbar disc degenrative disease (l3-l4, l4-l5, l5-s1) with sciatica?

Elliptical. Trainers and spin cycles for cardio and fixed weight machines such as nautilus for strength. Follow back strengthening exercises as instructed by a sports related physical therapist. This will minimize your risk of recurrent back pain. There is also some benefit to inversion tables but not without expert advice and direction. Read more...
Exercises. Check this web page for exercises for your back pain with sciatica. http://bit.ly/nrexte. Read more...