Spot on Karin!!! Terminal knee extension or extended the leg with resistance, a load, ankle weights, etc from 15 degrees to neutral biomechanically creates a shearing force of the ACL on the tibia placing increased load on the graft and should be avoided. There are studies that have examined how many forces, I am not aware of that information measured in newtons(F), but it is out there.
Lunges BTW do not hurt the graft after 8 weeks of healing also! That is also a misnomer.