Endochondral ossification

Bone matrix formed from (hyaline) cartilage template, and which is the process responsible for most of bone growth in vertebrate skeletons (see figure below).  The first site of ossification occurs in the diaphysis or shaft.

The process of endrochondal bone growth. Also called cartilage cells, chondrocytes are polymorphic connective tissue cells that produce and maintain the cartilage matrix. Osteoblasts derive from fibroblasts, and contribute to the production of bone as they mature, as well as secreting enzymes that facilitate mineral deposition. .  

See Chondrification, Diaphysis, Epiphysis, Joint capsule, Mesenchyme, Musculoskeletal system, Ossification