Recovery from Torn Rear Suspensory Ligament

Hi, I have a standardbred horse I am about to get from someone else on lease. He tore his rear Suspensory Ligament 2 years ago. He had it scaned 8 months ago and it was fine (scar tissue recovery, not stem cell).
The guy who owns the horse was about to jog it up 8 months ago but his son got sick. His son is only 20months old and has been diagnosed with a terminal disease which has not been seen in Australia for 14 years.
Basically I do not want to let him down, I know that I have to warm the horse up before races and then cool the ligament after races, but does anyone else have any previous experience in the same injury and any help for me. I also know I have to keep him away from jogging in sand and other soft tracks.
Please help.
:(

Hi trusspt, my name is stacy, just joined, my showjumper done the same injury in the hind leg also, she was 20yrs old when she done it, I was told cos of her age and cos the injury was a hind leg that the chances of her jumping again were slim, but I had insurance so I took a chance on her, had mths off work lots of treatment, and thousands of pounds later, she came sound and ligament healed competely, 2 me and my vets amazement, I was able to jump her again, she was jumping better than ever, she carryed on for another 3yrs, jumping most weekends.
I had 2 be careful that I did not ride or jump on muddy sliperly, deep or too hard ground, had to stop jumping on grass, which I hated anyway, but apart from that I had no other problems, I always put boots on her 4 support, in the field and when riding her, ialways warmed her up 4 15-20 mins be4 any work, I always put an ice pack on 4 10-15mins after any hard work or if I been out competeing all day, then I would bandage over night and light exercise next day, just a short hack on roads in walk only.