What does tightening around the foot mean?

Have numbness & tight feeling in feet & toes. Had an x-ray of lower back. Radiologist’s report noted slight scoliosis and heavy vascular calcification.

It could be related but you wouldn’t be able to definitely tell from just a plain xray. Vascular calcification could cause lack of bloodflow to your legs which could be causing numbness. But again, just because there is calcification seen on xray doesn’t mean you have an actual blockage.