Because that is where it comes into contact with other bones and provides a low friction protective covering allowing for smooth painless movement of joints of the bones.
Because epiphyses are covered by articular cartilage
articular cartilage
end of epiphyses
Articular cartilage is cartilage which covers the surface of the bone in synovial joints. Its function is to reduce friction between the bones. It is a type of cartilage called hyaline cartilage.
hyaline cartilage
articular cartilage
on the epiphyses
Articular Cartilage
hyaline cartilage
Intra-articular pathology would be disease of the articular cartilage and would encompass arthritis, cartilage erosion, neoplasia and developmental disorders of cartilage and subarticular bone.
hyaline cartilage
At articular surfaces. And epiphysial plates in children