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Table 3 Grades of heterotopic ossification at 2-year and final-follow-up

From: Clinical and radiographic outcomes of cervical disc arthroplasty with Prestige-LP Disc: a minimum 6-year follow-up study

Grade of HO

2-year follow-up

Final follow-up

0

59 (76.6%)

44 (57.1%)

1

6 (7.8%)

7 (9.1%)

2

4 (5.2%)

8 (10.4%)

3

6 (7.8%)

10 (13.0%)

4

2 (2.6%)

8 (10.4%)