I'm so sorry to hear this and wish I could give you better news.
My girl Darcy has just had a TTA op for the same thing.
A TTA is considered a better upgraded version of the TPLO.
It has a quicker recovery time too.
From what I can gather an operation is really the only way forward or she will have to be on restricted exercise forever.
Apparently they have to reshape the bone in the stifle so that they learn to use the leg without relaying on the cruciate ligament.
I research this like hell before agreeing to anything and many dogs once they had one leg go the other went within a year.
The other thing I found was to make sure you go to a surgeon who has performed the operation many times especially a TTA.
We were lucky as I'm only ( only I say !! ) 2 hours from a huge veterinary college who are at the forefront of veterinary technology in the UK.
It also not cheap. Darcy's just cost £3100 for one leg and has to go back for her second leg doing in a few weeks. Luckily she is insured.
So far we are in week 5 of recovery and she is doing great and to be honest was using her leg the day after the op.
she has been fantastic with the restricted exercise too.
I use a baby pen to confine her in a small area of the room as she isn't allowed on sofas or up stairs.
It been hard for us all, we are all sleeping in the living room so she still feels like part of the family. ( would hate for us all to trundle off to bed and leave her ). The hardest part is leaving her behind when it's walkies time but we just give her a chew and she seems happy with that and actually looks forward to it.
We go back on Thursday for her X-ray to see how she is healing and if its healing ok then she will be scheduled for the other leg doing ASAP.
I've attached a couple of links so you get an idea of the op and what's required during recovery. http://ttasurgery.com/ http://charlotteveterinarysurgery.com/recovery-tta/
If you need any advise please don't hesitate to ask. Sent from my iPhone using Petguide.com Free App