My OTTB did his suspensory twice. It ended his race career. Unfortunately I have no idea how severe the injury was and if it was scanned now, all the results would show is that there was damage. I also don't know his initial treatment. So that is not much help.... This may offer you some hope though, After his race career was over and he was declared sound, he was turned out into a paddock and left to be a horse for a few years before I bought him.
He is rising 10, has been checked over by 2 vets and declared sound. He is ridden 3-5 times a week (depending on what competitions are on the weekend and which horse I am taking). I have had him over 12 months and in that time he has; galloped around his clay paddock in the middle of summer - without a rider (the ground is rock hard, like concrete), He has cantered in his clay paddocks when it is wet (in clay deep enough to suck one of his shoes off) for a week until his winter paddock was ready - without a rider, he has jumped (not often) up to 60cms, is ridden out and also competed at various show horse days, dressage days and also one ODE (at 45cms).
I am selective with how I increase Bo's workload - I take is slow and gradually build up the intensity, as per my vet's advice. I know he will never be an eventer or a show jumper and when he jumps, it is only little jumps to break things up and keep things interesting. I am aiming to take him as high as he can do in Dressage. His body will be able to cope with Advanced... his leg may not allow him to get that high, I don't mind. He is enough of a challenge and a lovely boy to have around. I am content to work with his limitations.
I manage him with Bowen Therapy (as I am a trained Bowen Therapist), Stretching, working him in water and I also use Photonic Red Light Therepy on his leg with good results. The red light helps to promote cellular healing and stimulates the blood flow and production of Collagen, which is essential in the healing of damaged tissue. As Suspensories don't have a lot of blood flow, even a slight increase can assist healing them. Here is a link to some of the research that has been done on the efficacy of Red Light Therepy. ResearchRed Lights Therapy Kits | Red Lights Therapy Kits
Here is some pics of Bo in action
Bo's first Show Horse event... A first, two seconds and a fourth. bodonkey.jpg
Bo last weekend bodonkey1.jpg
Fitness work at the beach bodonkey3.jpg
Second ever show horse event bodonkey4.jpg
From what I have read about the prognosis of suspensory injuries, they very much depend on correct diagnosis, the speed at which treatment starts and the location of the damage. I would not be waiting to get the scan done and also do a heap of reading about treatment and rehabilitation of suspensories. You can PM me is you have any other questions about Bo or my management of him. :)