Review Question - QID 219174

A 32-year-old male is involved in a motor vehicle collision where he is the restrained driver. He has to be extracted from the vehicle and his knees appeared to have directly impacted the dashboard. He complains of pain in the right hip upon arrival to the trauma bay. Radiographs and CT scans reveal an T-type acetabular fracture. He undergoes open reduction and internal fixation the following day through an extended iliofemoral approach and receives post-operative external beam radiation the same day. At his 3-month follow-up radiographs are obtained and there is already a noticeable amount of heterotopic ossification (HO) developing. Out of the answer choices listed, what is the most likely reason for HO development?