My first pre-op PT session was yesterday.
It turns out I'd only lost an estimated 25% of my quad strength after my ACL injury, so that isn't too bad. I also seem to have a good degree of ROM (but I can't remember what the figure was).
My therapist taught me some other exercises to do till the next session on Tuesday. This is now my regiment every day (at least twice a day):
Quad sets: 3 x 20 (hold for 5 seconds)
Ankle pumps: 3 x 15
Quarter depth wall slides: 3 x 15
Hamstring curls with rubber stretch band: 3 x 15
Proximal rectus stretch: 3 x 30 seconds
Straight leg raises: 3 x 15
Proximal hamstring stretch: 3 x 30 seconds
It gives me confidence to be able to do each of these exercises fully, but I still wonder if I'll ever get my full ROM back again, and if I'll be back to 100% eventually, if not soon.