case_images: PMC7596536_01
case_images: AP X-ray of the pelvis demonstrating an avulsion fracture of the right AIIS with large amount of bony callus.
case_images: CRIOR2020-8893062.001.jpg
case_images: PMC7596536_01_CRIOR2020-8893062.001.jpg
case_images: fig1
case_images: Imaging with X-rays was remarkable for a large heterotopic bone mass at the AIIS that extended 117 mm distal to the AIIS and a maximum lateral distance of 64 mm (Figure 1).
case_images: Axial CT scan demonstrating the large amount of bone deposit from the right AIIS avulsion fracture.
case_images: CRIOR2020-8893062.002.jpg
case_images: PMC7596536_01_CRIOR2020-8893062.002.jpg
case_images: fig2
case_images: AIIS avulsion fracture with a 117 mm x 65 mm bony "mass" (Figures 2 and 3). At this time, his diagnosis was consistent with extra-articular subspinal impingement.
case_images: (a) Coronal CT image demonstrating the right AIIS and the large amount of heterotopic ossification. (b) Another sequence from the coronal CT imaging demonstrating the extent of bone growth.
case_images: CRIOR2020-8893062.003.jpg
case_images: PMC7596536_01_CRIOR2020-8893062.003.jpg
case_images: fig3
case_images: AIIS avulsion fracture with a 117 mm x 65 mm bony "mass" (Figures 2 and 3). At this time, his diagnosis was consistent with extra-articular subspinal impingement.
case_images: Picture demonstrating actual size (117 mm x 65 mm) of the heterotopic ossification.
case_images: CRIOR2020-8893062.004.jpg
case_images: PMC7596536_01_CRIOR2020-8893062.004.jpg
case_images: fig4
case_images: We proceeded to the operating theater and removed the heterotopic ossification through an anterior Smith-Peterson approach to the hip (Figure 4).
case_images: Postoperative X-ray 1 year after heterotopic bone removal.
case_images: CRIOR2020-8893062.005.jpg
case_images: PMC7596536_01_CRIOR2020-8893062.005.jpg
case_images: fig5
case_images: The postoperative X-rays at one-year follow-up demonstrated no new bone deposition (Figure 5).