After a period of decelerating height velocity, growth virtually ceasesbecause of epiphyseal fusion, typically at a skeletal age of 15 y in girls and 17 y in boys.

• 长骨生长主要依靠其干骺端的软骨骨化和骨膜下成骨作用使长骨增长、增粗，当其干骺端骨质融合后，长骨即停止增长。