Anterior Bone Loss after Cervical Baguera C Disc versus Bryan Disc Arthroplasty

Figure 3

Radiographic images of different grades of anterior bone loss (ABL). (a) No ABL was noted through the follow-up period (grade 0). (b) Resorption of marginal spurs was found in both the upper and lower adjacent vertebrae at 3 months postoperation. Note that there was no change in body contour, and this condition was classified as grade 1a ABL. (c) Change in body contour was found in both the upper and lower adjacent vertebrae at 6 months postoperation. These changes were classified as grade 1b ABL. (d) Grade 2 ABL was found in the upper and lower adjacent vertebrae at 3 months postoperation. (e) Resorption of anterior marginal spurs over the upper and lower adjacent vertebrae at 1.5 months postoperation was considered grade 1a ABL. The ABL progressed by 6 months postoperation to a change in body contour (grade 1b). (f) Grade 1 ABL was noted at 6 months postoperation over C5. At 12 months postoperation, the ABL at C5 progressed to grade 2. Grade 1 ABL over C6 was also noted at 12 months postoperation.

(a)

(b)

(c)

(d)

(e)

(f)