DDog2 managed to rupture the cruciate ligaments in both knees, late in 2014. She had surgery on both, in 2015 - different procedures on the two knees, because she had different surgeons for each.
The first procedure was a Tightrope procedure - basically, they use a braided nylon wire to stabilise the joint whilst scar tissue forms to support it.
The second op was a Tibial Plateau Leveling Osteotomy - where a wedge of bone is removed from the tibia, to reduce the slope of the tibial plateau - changing the geometry of the knee makes it more stable.
After the first op, she had 9 weeks cage rest, with gradually increasing exercise after the first two weeks, then had her second op, with another 6 weeks cage rest. During the first few weeks after each op, she needed a sling under her tummy, to support her when she went out to the garden, and to help her up and down the couple of steps to the lawn, and to prevent her slipping on our hard floors. She hated doing her business on the lead, so we made a little enclosure on the lawn, in which she could do her business off lead - but where there was no space for her to run, jump or slip, and where I could catch her at the entrance to put her back on the lead.
Initially, she did very well after the operations, and by the late summer, she was starting to build her stamina and muscle tone back up (all that cage rest did take a toll on her) - but then she dislocated her kneecap, and needed a third operation - and went straight back on cage rest. Unfortunately she developed a gastric ulcer, as a result of the anti-inflammatories she was taking, and had another admission to the vet hospital, but once that was sorted, she did recover pretty well - though more slowly than they hoped - she ended up on cage rest for over 10 weeks that time.
She was finally discharged by the vet hospital, early this year, and has been building up her levels of activity, stamina and muscle tone - and she is now 100% fit, happy and active. It has been a long road (for her and for us) - and an expensive one too (thank heaven for PetPlan), but it has all been worth it, because she is now pain-free, and fully active again - if anything, her gait is better now than it was before she ruptured the ligaments in the first place!