Fig. 2From: Association between anterior bone loss and anterior heterotopic ossification in hybrid surgeryMeasurement of anterior bone loss. a and b Immediate and 6-month postoperative lateral radiographs, p and p’ are the length of the prostheses. e and e’ are the length of the endplates. EL% = 100% × (e / p) / (e’ / p’). c At the last follow-up, the lateral radiograph shows peri-prosthesis bone loss at the anterior vertebral body margin (white arrow)Back to article page