Knee Orthosis for a dog

Will any of you out there with experience,good or bad with knee =
orthotics on a dog.=20
I have a local nurse who has a lab/ rotweiller mix who has 2 bad knees.
The worst one had a monofilament ACL replacement but when the vet got in =
he found the meniscus in several pieces. He completely removed the =
meniscus. the dog now has tremendous crepitus and does not use the leg =
except for balance when he stops Amputation doesn’t seem viable because =
the other knee is also bad
Thanks in advance,
Mike Kiser CO