Inflamed suspensory ligament with migration to the superficial flexor tendon (flexes pastern). The inferior check ligament is also involved with inflamation migration to the flexor muscle. Most probably caused by hyperextention.
Take 20 ibuprophen, 2 pid, and rub with AsperCream for 4 days, 4 pid.
Or, he could of just brused it.
But that’s just my opinion. (Please Note. Will Decker is not a licensed Vet or a professional in medicine. He just plays one on this board (sometimes).
Extensor tendons would be involved in that area, but with inflamation it should show up hot. Both the cap of the hock and the front of the leg were much colder, and from my understanding is an indication of possible nearve issues and or obviously a lack of blood flow.
I would be curious as to what the leg looked like after a little exercise. There was no indication of lamness, and never has been with this one. I can almost bet if they would get the horse adjusted the color may just come back.
And FYI I have been shoeing horses for over 15 years, and have traveled all over the country doing so. It’s a job I have been trying to get away from permenantly, but I don’t think I will ever be rid of it completely.