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Lateral radiograph of cervical spine showed hyperlordotic positioning of prosthesis with extensive heterotopic ossification (white arrow) and incomplete decompression (black arrow) at C4-5 (A). Magnetic resonance imaging showed herniated disc compressing cord at C4-5 (B). Intraoperative photo showed removal of prosthesis (C). Lateral radiograph of 2-year follow-up showed anterior removal of prosthesis, decompression with solid fusion at C4-5 (D).
