This is not necessarly to be fused when our aim is to treat listhesis.. the treatment of listhesis is fixation and not fusion (fusion is the oldest naming maybe still used by some radiologist), SURE your vertebra are fused even if you still have some heaviness in the lower parts of your back.. this is suffucient to have screws at place to say thatthe patient is fused.
So dont worry and take a minimal dose of antiinflammatory medications
you are welcome
Thank you