Compare and contrast event occurring on the epiphyseal and diaphyseal faces of the epiphyseal plate?

The cartilage cells at the epiphyseal side are continuing to grow and divide mitotically, while the ones on the diaphyseal side are aging, dying and then osteoblasts move in to form bone. See this...

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(1) growth of cartilage on the epiphyseal side of the epiphyseal plate and (2) replacement of cartilage on the diaphyseal side of the epiphyseal plate with the osseous tissue.

The cartilage cells at the epiphyseal side are continuing to grow and divide mitotiacally and the diaphyseal side are aging and dying and the osteoblast move in to form bone. So they are growing on...

The epiphyseal plate (or epiphysial plate, physis, or growth plate), the hyaline cartilage plate in the metaphysis at each end of a long bone