I'd rather not start my own thread since there seems to be quite a few threads about extensor tendon injuries... so I'd like to post some pictures of my own issue right now, and ask a few questions. I am working very closely with my vet to try to get this wound to heal... but i don't want to be one of those crazy people that calls and texts their vet every 5 minutes. haha!
My horse has been completely sound through this whole thing, which is crazy to me. He's currently on a titrated dose of Prednisone, as well as 1 gram of Bute daily. The first picture is when this all started. Just looks like an empty hole. The next two pictures are from today. The vet says she wants me to start leaving him unwrapped so that the wound can dry out. Unfortunately, the wound just weeps and the leg swells up. So is this pretty normal? The swelling is what upsets me the most. When he's ridden, or wrapped, the swelling goes right down. But if i leave the leg unwrapped for more than 30 minutes, then it ends up like this. ugh! How long did your horses leg swell, Xxdanioo? Do you have pictures of how it looks now?
I'm no vet so I can only tell you my experience with something like that.
The wrapping helps the lymphatic system to pump fluid back into the main circulation. Wrapping also makes the vessels 'lazy', so to speak. So when you remove the wraps the vessels have less pressure in them & the fluid tends to collect, kind of a rebound edema. The swelling also pushes extra fluid to the path of least resistance (the hole), which though it looks bad may be good.
If it were my horse I would leave the wraps off, let it swell & let the vessels get back to what they normally do on their own. I know it sounds a bit daunting to let it swell but you need to break the cycle & I think the body will do it, though it may take a few days. You may even see some yellowish seepage from the normal skin but as long as the leg doesn't get hot or painful just keeping it clean should be enough.
I would expect the swelling to creep down towards the foot as that is the best way for the body to get rid of it, by the hoof's pumping action.
The steroid is likely preventing faster wound healing & weaning off it would be best. You probably already know it can't be quickly stopped.
The bute should be fine.
Again, I'm no vet & your vet is the best one to advise you.