after 7 weeks of fracture
there are very less chance that you may have displaced the fracture, because callus
formation has already begun and it helps in binding the fracture. the weakness is because of the pain that you are encountering because of the fall.
on 7 weeks you should avoid weight bearing, even minimal because of two reasons
1. first reason you yourself has encountered.
2. the 2 mm compression can get more because all the body weight is transferred from femur
to tibial plateau. your fracture is in state of union but has not consolidated yet so there are chances of further depression
. consult with your doctor and physical therapist again.