I'm using 24h turn out, no box rest, an arc equine and ice vibe boots as my horse hates the hose and the hose is not very cold supposedly to be effective the water temp should be a consistent 5 degrees or less otherwise it's not supposed to be worth the bother you cool the skin and be surface but not the leg
Lives though this many times. The answer is that it depends on your budget and how bad the damage is on the ligament. Stall rest and cold hose is always the case. 12 weeks is protocol and can go much longer depending.... Obviously hand walks in there. Then treatment can by ultrasound, sock wave etc is super effective. If it's a re occurring thing there are also solutions with stem cells
use of a theraplate is excellent therappy, and helps reduce muscle atrophy while on stall rest
My friend has had success with shockwave therapy, with lots of rest as well. The best is time off to allow it to heal, she gave her gelding at least 6 months of for it.
Exercise aggravates suspensory, so give him some rest in the box as well :)
Firstly you should cool down, the heat and swelling are signs of inflammation, which can interfere with healing! The first step is to bring them down :)