osteochondrosis

noun

os·​teo·​chon·​dro·​sis -ˌkän-ˈdrō-səs 

plural osteochondroses -ˌsēz 

: a disease especially of children and young animals in which an ossification center especially in the epiphyses of long bones undergoes degeneration followed by calcification

osteochondrotic

-ˈdrät-ik 

adjective