I don't think so...It's not his ACL or knee as far as anyone can tell. None of the vets (including an orthopedist) though it was. The best they could come up with was a possible pinched nerve (only diagnosable with an MRI). He really does use his leg like a crutch, so I would assume that wouldn't change with a brace. And $500-$1000 is a lot to spend on something you don't really think would help I did look at them when I thought it was his ACL, but now I don't think it would be a help at all.