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Table 4 CORs lateral bending for ML-N compared to the COR for maximum lateral bending ML-MR (ML: maximum left; MR: maximum right; N: neutral)

From: Cervical disc prostheses need a variable center of rotation for flexion / extension below disc level, plus a separate COR for lateral bending above disc level to more closely replicate in-vivo motion: MRI-based biomechanical in-vivo study

Level

COR

z

y

ML-N

ML-MR

ML-N

ML-MR

C 3/4

mean

-6.8

−7.0

7.3

8.1

SD

5.1

3.2

6.8

7.3

P

0.928

 

0.780

 

C 4/5

mean

−8.0

−5.9

10.5

14.9

SD

5.3

3.8

6.8

6.4

P

0.286

 

0.120

 

C 5/6

mean

−5.8

−6.1

13.4

15.9

SD

7.2

2.9

7.9

9.3

P

0.890

 

0.483

 

C 6/7

mean

−4.4

−9.1

9.4

9.8

SD

13.6

8.6

9.9

9.2

p

0.303

 

0.925

 
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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