My 16 year old gelding has an old splint. It has been there for a very long time. I have had him 4 years and have never had a problem with it. Until this past December. He randomly started limping when I got on to ride at a lesson. My trainer felt his leg and said it feels weird but she was not sure what it was. So I took him home and put him on stall rest. I noticed his leg looked weird. It did feel "off" almost like more little "splint" bumps. I iced it and had him on stall rest for 3 weeks with hand walking of course. Well he was not limping anymore and that leg didn't seem to hurt him when squeezed. That was in January. So for the past few months I have been taking lessons, trail riding a lot, jumping him, even did an intro endurance ride (like 8 miles) and he vetted out good and never missed a beat. Well, about a week and a half ago, I hopped on him for a lesson. And...he started limping again. Now I really am worried. His splint bone looks like more little "splint" bumps have popped up. The bumps are bony and hard. The area around the back of his leg is a little puffy and hot. For the past week and a half, I have been icing it and he has been on stall rest. I took him to the vet this past Friday. They trotted him out in hand and he was a tad bit off. So they did their flexion test and he really started limping. The vet was sure it was going to be that splint bone causing it so he did a lidocaine block on his whole foot to be sure. Well now the vet thinks it is his foot. But that does not make any sense because that splint bone has changed. I am taking him back to the vet today but it is a different vet because the other vet is too far away. We thought they would figure It out in one visit. So they wanted that lidocaine to wear off then block different parts of the foot. But look at these pictures of his leg! I don't know how well you guys can see it. The inside of his leg where is splint bone is, is almost bowed out but actually its a bunch of bumps.
So what the heck is this and will I be able to event on him