22 March 2021: Clinical Research
Heterotopic Ossification After Prestige-LP Cervical Disc Arthroplasty Is Related to Insufficient Sagittal Coverage of the Endplate By the Prosthesis
Shuai Xu ABEF* , Yunsheng Ou ABCDE , Xing Du ABEF , Bin He ACDEF , Yuanqiang Li BCE , Haoyang Yu CDEDOI: 10.12659/MSM.929890
Med Sci Monit 2021; 27:e929890
Figure 4 A 52-year-old woman with C4/5 and C5/6 Prestige-LP cervical disc arthroplasty. Preoperative flexion and extension roentgenographs measured the preoperative segmental ROM: C4/5 ROM=6.43°, C5/6 ROM=7.48° (A, B). Postoperative flexion and extension roentgenographs measured the postoperative replacement segment ROM: C4/5 ROM=7.66°, C5/6 ROM=8.07°, posterior margin of the upper prosthesis-endplate distance: C4/5=4.7 mm, C5/6=6.0 mm, posterior margin of the lower prosthesis-endplate distance: C4/5=2.7 mm, C5/6=3.1 mm (C, D). Postoperative flexion and extension roentgenographs after 12 months measured the replacement segment ROM: C4/5 ROM=7.26°, C5/6 ROM=3.76° (E, F), and the postoperative 12-month roentgenograph revealed C4/5 McAfee Grade II HO and C5/6 McAfee Grade III HO (G, arrow).