The biomechanical effects on adjacent segments after two-level ACDF with reduced lordosis

• DOI: 10.3760/cma.j.issn.0253-2352.2016.06.005
• Publication Date: 2016-03-16
• Authors: Chuan Pang; Yong Hai; Jincai Yang; Yuzeng Liu; Baoqing Pei; Hui Li; Dan Zu; Gang Zhu; Xuguang Xia
• Keywords: Facet (psychology)

Objective To study the biomechanical effect on adjacent segments of anterior cervical discectomy and fusion (ACDF).

Methods 6 adult human spine specimens (C2-C7) were tested under following 3 conditions: intact group, C4-6 ACDF with normal lordosis reduced group. The in flexion, extension, bending rotation 3D motion experiment system. Cobb angle, overall range (ROM), ROM loads facet joints at measured.

Results The angle was 13.5°±4.1° 15.7°±4.6° 9.0°±4.0° respectively. After operation rotation, but upper lower increased. (C3-4) flexion as well that (C6-7) extension had significant difference. segment group found greater than also greater. Increased max average stress C3-4 observed all 4 types after differences statistically significant. Comparing a decreasing trend along no difference.

Conclusion After 2 level specimens, is higher those lordosis, which may accelerate ASD.

Key words: Cervical vertebrae; Spinal fusion; Biomechanics