Primary Hip Replacement: 20% of patients (IMAGE) UT Southwestern Medical Center Caption Patients with extremity injuries sometimes develop a condition of aberrant healing called heterotopic ossification (HO) in which bone grows in nonskeletal tissues. The above images show the incidence of HO in specific types of injuries or procedures. Research at UT Southwestern is pioneering novel pathway and prevention strategies to mitigate this debilitating process. Credit UT Southwestern Medical Center Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.