In my experience, time off in movement is beneficial provided the injury does not need controlled management for the first duration of healing. Time off in a stall… not always beneficial. So if you mean “thrown out” to 24/7 pasture with a run-in and buddy, I say it may be worth a try depending on what you’re dealing with. If you mean “throw out” as in, stalled 1/2 the time (so, like a normal horse in a normal boarding barn 8 hrs turnout, 16 hrs of stall…) I’d say don’t waste your money/time.
I do not believe that “time off” in a stalled environment is beneficial to horses when they are in the rehabilitation phase of their rehab. I firmly believe that this, plus impatience in returning to work, are the two major reasons so many horses get re-injured. However… stalling is beneficial when they are in the healing phase and is necessary when you are managing the early stages of healing from most injuries. My experience has been time off, stalled, makes horses overall more body sore and doesn’t help in any way to condition the limb once the injury is healed and ready for rehabilitation.
I threw out a TB that had a pretty severe RF suspensory injury, IIRC something like 70% tear. It was over a decade ago. He was so awful in the stall (rearing, weaving, spinning) that after a few days of no change, I figured he’d be quieter if he was out. He was. He lived out 24/7 for about 2 years before I brought him back into work - that time frame was more because we were really conservative, and also, didn’t need to rush. He then went back to his prior level of work (BN) and then surpassed it, training up to Training level and carrying a Pony Clubber up through the levels for the next 10+ years.
Another TB we had, returned from lease dead lame and if I can speak frankly, was not in the best of care on his lease, which I was not aware of as I was out of state being someone’s working student. He had sustained a stifle injury (meniscus tear) and after speaking to some boarders at the barn, I learned he was lunged for an hour every day prior to being ridden… Anyway, in his case we stall-rested until rads showed stifle was healed enough, and then threw him in a herd on a hill in 24/7 turnout. Injected his stifle, kept him on hacking only for the first six months he returned to work, and then and he returned to being a BN horse for a friend. No issues.
I have also turned out a horse that had an absolutely gnarly 100% medial/lateral collateral ligament rupture in his hind leg. After 2 months of stall rest and a few re-imaging checks, vet and I agreed he’d be fine in full turnout because he was quiet, and naturally a horse that protected himself. He had another 5 months of no work at all, and then a very conservative rehabilitation plan where he hacked daily (walking only) for about 5 months. He returned to full work, no problems.
With all horses, these were very conservative plans. As a non-boarder, I have the luxury of taking my time… not an option that all people who pay premiums for boarding can afford.
My two cents, know the horse and their turnout habits, and know the injury. There are some injuries and/or issues that really benefit from the low impact, constant movement that 24/7 turnout requires. Stifle injuries, suspensory injuries, and some other soft tissue injuries, in my experience, can really benefit – once they have been proven to be partially healed by ultrasound and/or under vet’s guidance. My opinion and experience is the full turnout conditions the limbs way better than a controlled management regime could, and reduces risk of reaggravation in the future. YMMV.
Something to consider… my horses have been in full turnout (24/7, with run ins) for the last 15 years. Barring the suspensory, which was caused very poor shoeing that at the time I was not educated enough to recognize, we have been very lucky when it comes to soft tissue/work related injuries. The collateral ligament rupture horse came to me with the injury, and the stifle horse returned on lease with his injury as well. I hate to possibly tempt fate by saying this, but I really firmly believe the reason we have not been sidelined like peers in my barns have with random soft tissue injuries, is because our horses are constantly out, moving around, and the lack of stalling them has made their bodies stronger, healthier, and more resilient in work. We are eventers, if that matters…