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Assessment of heterotopic ossification in plain antero‐posterior (AP) radiograph at 36 months post dual‐level L3/L4 & L4/L5 Charitè disc replacement. Radiograph demonstrated circumferential formation (CF) of peri‐prosthetic bone at L4/L5 (Lat radiograph not shown). Unilateral bridging (UB) and marginal osteophytes (O) were visible at L3/L4.
