The Official journal of the China Association of Rehabilitation of Disabled Persons and the 88th Hospital of PLA

Composite Impact Factor:

0. 948 (2015)

Total citation frequency: 3868 (2015)


ISSN 1005-8478

CN 37-1247/R

Biomechanical analysis on PEEK rods in cadaveric sheep cervical spine

Author : WU Jie, GUO Zheng, SHI Lei, et al.     
Working unit : Department of Orthopaedic Oncology, Xijing Hospital, The Fourth Military Medical University, Xi'an 710032, China
Page : 448-452
Key words : cervical spine, polyetheretherketone (PEEK) rod, titanium alloy rod, biomechanics

Abstract:

Objective

To evaluate the biomechanical characteristics of polyetheretherketone (PEEK) rods of 3.2 mm in diameter for cervical spine by comparing with the traditional titanium alloy rods.

Methods

Six fresh cadaveric sheep cervical spines (C3~C4) were used for this study. After intact specimens had been tested, partial facetectomy was performed on the  spine to create a destabilized model. Subsequently, the destabilized spines were instrumented with PEEK rods or Titanium alloy rods randomly. Nondestructive biomechanical testing was conducted on each specimen to evaluate the axial displacement, axial rigidity, micro-strain of anterior vertebral body and intervertebral range of motion (ROM) in flexion, extension as well as lateral bending.

Results

The ROMs in both the PEEK group and titanium group were significantly less than that of the intact group (P<0.05) , while the ROM in the PEEK group was greater than the titanium groups in lateral bending (P<0.05) . In addition, the axial compression rigidity of the PEEK group and titanium group was significantly higher than that of the intact group (P<0.05) ,whereas the rigidity of the PEEK group was significantly less than that of the titanium group (P<0.05) . In term of micro-strain in C3, the PEEK group and the intact group were significantly superior to the titanium group (P<0.05) , despite the fact that no significant difference was noted between the PEEK group and the intact group (P>0.05) .

Conclusion

The PEEK rod of 3.2mm in diameter does provide enough biomechanical stability for sheep cervical spine, associated with increased intervertebral compression stress over the titanium rod, which has potential to promote intervertebral fusion.


summary:
Biomechanical analysis on PEEK rods in cadaveric sheep cervical spine   
WU Jie, GUO Zheng, SHI Lei, et al.
Orthop J Chin,2018,26(5):   448-452