When this happened to Billabong......I did some research and discovered a procedure known as the (Arthrex) TightRopeŽ CCL Repair.
I called around to our local vets and was given the name of a vet who was known for his ability to do this procedure.
Got a hold of him and had a really great conversation about it. He was very impressed with me that I did the digging to find out about it. He had performed it quite a few times with success. Asked that we bring BB in for an evaluation. They have to determine if the patient's condition is conducive for this procedure to work. It's not for every situation.
Procedure went great!
Then almost a year later her other knee went, so we did that one too! Which also went great and BB was with us for another 11 years before Lymphoma ended her life.
This procedure is more cost effective....and less intrusive.....but you'll have to call around to see who can do it and if your pup is a good candidate....determine by X-rays and physical exam of the joint.
Some links:
https://www.arthrexvetsystems.com/resources/animation/7SUHhhbj4U6jIAFdHl-Wxg/tightrope-ccl-repair
https://www.arthrex.com/shoulder/knotless-ac-tightrope-technique
Coastal Veterinary Surgical Services - Arthrex TightRope Procedure
https://www.arthrexvetsystemsblog.com/2017/04/12/how-two-tightrope-procedures-helped-a-170-lb-lab-play-ball-again/
https://wcvs.org/documents/TightRope-Client-VLP0004C.pdf
And there are more. Search on You Tube also for more content......
You may have to really beat the bushes to find a vet who can and will perform this. Don't give up....just keep dialing.... GOOD LUCK!!!