Stan, at the grand old age or 18, put a huge hole in both his suspensory and check ligament.
I'm 45mins from one of the best equine hospitals in the UK and even they were not convinced he would ever be ridable again, infact they were fairly sure he would never be sound again.
We tried stem cell therapy but the cells taken from him failed to divide (age probably a cause), we tried ultra sound therapy, and laser therapy. I had him on so many suppliments to try and fix it.
6 months box rest and then turned away with a quiet companion for the best part of a year. During the 6 months box rest the leg was Iced (ice bandages) for 20 mins 5 times a day. He was on global herbs tendoneze the entire time.
He came sound and eventualy came back into full work, although he never jumped again. But I followed the Rehab program too the second, if the vet said 5 mins, the pony got exactly 5 mins walk not a second more or less.
It takes time and dedication but it can be done. Time is the worlds best healer
ETA - GET an ultrsound. It is essential to see where the problem is, what the size of the problem is and you need regular ones to see the progress