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(A) Preoperative left hip radiograph with heterotopic ossification (HO) visible, marked with arrow. (B) Three-dimensional computed tomography (CT) scan of the left hip with HO circled in red. (C) Axial CT scan with HO circled in red, just lateral to the acetabular rim of the left hip. (D) Intraoperative arthroscopic photo of HO and ablation device, visible through the anteromedial portal in the left hip. (E) Fragment of HO after excision.
