How to Say It: Het-toro-toe-pik Oss-if-a-kay-shun
by Cynthia M. Johnson, MA
Heterotopic ossification (HO) is the growth of bone in places where it is not supposed to be. It can happen anywhere in the body. The hip, knees, shoulders, and elbows are the most common places. Growths can be small or large.
The cause is not known. It may be due to genes or trauma.
Things that may raise the risk of this problem are:
The problems a person has depends on how serious HO is. It also depends on where there is bone growth. Problems may be:
You will be asked about your symptoms and health history. A physical exam will be done. You may be sent to a specialist.
These tests may also be done:
The level of care needed depends on how serious HO is. Choices are:
There are no known guidelines to prevent this health problem.
Ortho Info—American Academy of Orthopaedic Surgeons
United Spinal Association
Canadian Orthopaedic Association
When it Hurts to Move—Canadian Orthopaedic Foundation
Heterotopic ossification. Craig Hospital website. Available at: https://craighospital.org/resources/heterotopic-ossification. Accessed October 22, 2020.
Spinal cord injury—InfoSheet #12. Spinal Cord Injury Information Network website. Available at:
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Accessed October 22, 2020.
Last reviewed September 2020 by EBSCO Medical Review Board Daniel A. Ostrovsky, MD
Last Updated: 5/19/2021
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