There are three types of cartilage: hyaline, fibro cartilage and elastic. Fibro cartilage does not have perichondrium...so it does not take part in ossification because perichondrium needs to develop into periosteum. Hyaline cartilage has a more matrix in comparison to elastic cartilage. Hence, during ossification the quicker spreading of calcification of the matrix will lead to the death of the chondrocytes which will develop into osteoprogenitor cells. Is my theory correct?