The physis (pl. physes) or growth plates are found in bones that undergo endochondral ossification.
As the metaphysis and epiphysis mature and fuse, the physis thins, disappears, and enchondral ossification ceases. A subchondral bone plate forms with horizontally oriented trabeculae which appears as a radiopaque transverse fusion line (physeal scar). This line should not be mistaken for a stress fracture.