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

Table 3

Anterior bone loss of the lower adjacent level by grade.

	Grade 0 and grade 1 ()		Grade 2 ()		value
Sex					0.040
Female	30	(46.2%)	10	(83.3%)
Male	35	(53.8%)	2	(16.7%)
Age, years	56.0	(48.0, 65.0)	56.0	(46.0, 63.8)	0.983
Operative level					0.891
C3-C4	14	(21.5%)	3	(25.0%)
C4-C5	17	(26.2%)	3	(25.0%)
C5-C6	31	(47.7%)	6	(50.0%)
C6-C7	3	(4.6%)	0	(0.0%)
Hybrid					0.025
No	28	(43.1%)	10	(83.3%)
Yes	37	(56.9%)	2	(16.7%)
Depth of Baguera C Disc (mm)					0.410
13	1	(1.5%)	0	(0.0%)
14	20	(30.8%)	6	(50.0%)
16	44	(67.7%)	6	(50.0%)
Height of Baguera C Disc (mm)					0.006
5	14	(21.5%)	8	(66.7%)
6	47	(72.3%)	4	(33.3%)
7	4	(6.2%)	0	(0.0%)
Adjusted preoperative disc height (mm)	4.59	(3.74, 5.37)	4.05	(3.69, 5.01)	0.448
Postoperative measurements
Global alignment angle	19.0	(10.0, 25.5)	16.5	(13.3, 24.8)	0.833
Lordotic angle	6.0	(2.0, 12.5)	7.5	(3.3, 19.8)	0.208
Shell angle	0.0	(-3.0, 4.0)	3.5	(-0.5, 6.8)	0.029
Global ROM	45.0	(33.0, 54.0)	43.0	(28.0, 55.5)	0.391
Index level ROM	15.0	(10.0, 21.5)	15.5	(11.3, 23.3)	0.725
Adjusted anteroposterior diameter of the lower adjacent endplate (mm)	17.2	(16.1, 18.5)	15.6	(14.7, 16.8)	0.002
Mismatch (difference) between the implant and the lower adjacent endplate (mm)	1.7	(1.1, 3.0)	0.7	(0.3, 0.9)	0.001

Chi-square test. Mann–Whitney test, median (interquartile range). ; . ROM: range of motion.