Location: Ringbone lumps develop in the middle of your horse’s pastern on the dorsal (or front) surface. Don’t confuse this with the bumps inside and outside the pastern joint that are a normal part of your horse’s anatomy.
What it is: Ringbone is most commonly due to pastern-joint arthritis. The bumps appear when bone proliferates as the body tries to form a “bridge” to stabilize the painful joint.
Look and feel: Ringbone is a hard, bony bump. By the time you detect it, a ringbone bump can be about the size of a grape or almond, although it can grow to walnut-size over time.
Should you worry: The short answer: Yes. Many horses with ringbone become very lame. If you detect these bumps, have your horse examined. Expect that your vet will want to take radiographs to evaluate the area.