Ddog2 (a rescue Labrador-pointer cross) ruptured both cruciates, at the end of 2014, and had them operated on in 2015.
The first knee was done by a surgeon who favoured the Tightrope procedure (where a braided rope is passed through holes drilled through the top of the tibia and the bottom of the femur. This stabilises the joint for 6 weeks, whilst scar tissue forms, to support the joint, and prevent the movement which is causing the pain.
She needed 6 weeks cage rest afterwards - and in fact, we kept her on modified cage rest until her second operation, which was 9 weeks after the first.
Her second operation was a TPLO - tibial plateau levelling osteotomy, where a wedge of bone is taken out of the tibia, to make the slope of the top of the tibia less acute, so the femur doesn't slip on it, causing the pain.
She had another 6 weeks cage rest after the second operation, and, by the summer, she was starting to get back to normal - her knees were fine, but the extended cage rest had decreased her stamina and muscle mass, so she did have to work her way back to full fitness.
Sadly, just as she was getting back to normal, she dislocated her knee cap (a very rare side effect of the knee surgeries), and needed a third operation, involving moving a bit of bone, called the tibial tuberosity. She took longer to heal from this one, and was on cage rest, then modified cage rest until Christmas (complicated by getting a gastric ulcer from the anti-inflammatory so she was given following the dislocation).
So last year was pretty hard on her and on us (and on PetPlan - it was not cheap), but she is now 100% back to normal, running like the wind, walking beautifully, and in no pain.
The first couple of weeks of cage rest is the worst - they have to be in the Cone of Shame, which makes everything that bit more time consuming, and they need to be taken out to do their business, on a very short lead, with a sling under their tummy, to support them if they slip.
I made a sling with a spare lead, with a towel wrapped around it, and tacked together - the vet hospital did offer us a Proper one, but it was £60, and there was no guarantee that the insurance would cover it - so I got crafty and did it for free!
If you have any other questions I can help with, I am happy to try. Ddog2 and I will keep our fingers/paws crossed that your dog recovers as fast and well as ddog2 did.