endochondral
Adjective
Meaning
Growing or developing within cartilage; -- applied esp. to developing bone.
Source: Webster's dictionaryExamples
Osteochondrosis is a pathological condition in which normal endochondral ossification, the metamorphoses of cartilage to bone, is disturbed.
This is regulated by the structure of genes controlling the process for the bone growth of your fingers, called endochondral ossification.