We've pretty much narrowed down Samson's right-side limping to a partially torn ACL/CCL. We had an antinuclear antibody (ANA) test done on him and it came back negative. This test checks for any kind of autoimmune problems from rheumatoid arthritis to lupus. Since it came back negative, it narrows things down to some kind of injury; and since we know there's no damage to his bones, it's a soft tissue injury.
Because he already had a bad left hip, he probably overcompensates on his right side which led to him being rougher to that side. I'm sure Abby helped too because she likes to tackle him when they play in the yard. She probably T-boned him one day, and it made him hurt his knee.
As treatment, the only thing we can do is "conservative management" (it's pretty much the equivalent of bed rest). The vet says no running in the yard, very limited activity and to keep him as sedentary as possible, like he's in a crate (if we had a crate big enough, we'd just keep him in it, but alas...). I've been taking him out only while he's on a leash, so that he can't chase anything in the yard. It's also easier to keep Abby off of him this way.
Poor Abby doesn't understand why we won't let her play with him, though. She wants to jump on him and run around with him so badly. I feel bad, but we'll have to keep it up for quite a while. The vet says that if our conservative management is working, we should start to see some improvement at about 8 weeks. He won't be healed in 8 weeks, but we should start to see some improvement by then. If not, then we'll have to pursue other more invasive options (a.k.a. surgery).
We are also supposed to keep him on glucosamine+chondroitin, fish oil and remadyl to both manage his pain and also to promote the growth of scar tissue to strengthen his joint.
Hopefully all of this will work. It's gonna be a long 8+ weeks...
