I think it is probably broken it also might be swelled from running to much.... I hope this can help cause I love horses to.
That sounds like the cartilage in the joint of the knee has worn to a point where the bones have touched forming more bone in an attempt to repair the damage This leads, pain, stiffness and continued damage to the joint.
In adults, the ends of bones are covered by a type of connective tissue called articular cartilage. This cartilage provides a smooth surface that helps with joint movement and cushioning between bones.
Hyaline cartilage covers the ends of bones in many joints. It provides a slippery surface to reduce friction during bone movement.
Articular cartilage covers the joint surfaces of long bones. It is a smooth, slippery tissue that helps reduce friction and allows for smooth joint movement.
Cartilage in a joint acts as a cushion and provides a smooth surface for bones to glide over each other, reducing friction and preventing damage to the bones.
cartilage
Articular cartilage or hyaline cartilage.
Fibrocartilage is the type of cartilage found in the sockets of the hips and shoulders. This is the strongest type of cartilage.
cartilage
cartilage. Cartilage helps to reduce friction between bones in the joint and allows for smooth and painless movement.
The outer surface of the epiphysis is covered by a layer of hyaline cartilage known as articular cartilage. This cartilage helps cushion the joint and allows for smooth movement of the bones in the joint.
The smooth cartilage that surrounds the surface of bones at joints is called articular cartilage. It acts as a cushion and reduces friction between bones during movement, helping to facilitate smooth joint motion.