PMC7596536_01
AP X-ray of the pelvis demonstrating an avulsion fracture of the right AIIS with large amount of bony callus.
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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).
Axial CT scan demonstrating the large amount of bone deposit from the right AIIS avulsion fracture.
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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.
(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.
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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.
Picture demonstrating actual size (117 mm x 65 mm) of the heterotopic ossification.
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We proceeded to the operating theater and removed the heterotopic ossification through an anterior Smith-Peterson approach to the hip (Figure 4).
Postoperative X-ray 1 year after heterotopic bone removal.
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The postoperative X-rays at one-year follow-up demonstrated no new bone deposition (Figure 5).