Clinical and radiological outcomes of dynamic cervical implant arthroplasty: A 5-year follow-up

Figure 3 A 45-year-old woman receiving dynamic cervical implant arthroplasty due to C5-6 disc herniation. A: Preoperative computed tomography showed that there were osteophytes at the posterior rims of the C5-6 intervertebral space (orange arrow); B: At 1-mo after operation, the osteophytes were excised thoroughly (orange arrow); C: At the 12-mo follow-up, grade II heterotopic ossification formation was observed at the operated segment (orange arrow); D: At the 60-mo follow-up, heterotopic ossification developed further to grade III (orange arrow).