HO is an abbreviation of 'heterotopic ossification', where bone forms where it should not form, usually in the soft tissues.
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CLINICAL PUBLICATIONS
Heterotopic Ossification: A Comprehensive Review. Meyers C, Lisiecki J, Miller S, Levin A, Fayad L, Ding C, Sono T, McCarthy E, Levi B and James AW. JBMR Plus. 2019 Apr; 3(4): e10172.