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Comput Methods Biomech Biomed Engin. 2011 Nov;14(11):947-56. doi: 10.1080/10255842.2010.501762. Epub 2011 May 24.

Biomechanical differences of Coflex-F and pedicle screw fixation combined with TLIF or ALIF--a finite element study.

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Department of Mechanical Engineering, National Chiao Tung University, Hsinchu, Taiwan.


Lumbar interbody fusion is a common procedure for treating lower back pain related to degenerative disc diseases. The Coflex-F is a recently developed interspinous spacer, the makers of which claim that it can provide stabilisation similar to pedicle screw fixation. Therefore, this study compares the biomechanical behaviour of the Coflex-F device and pedicle screw fixation with transforaminal lumbar interbody fusion (TLIF) or anterior lumbar interbody fusion (ALIF) surgeries by using finite element analysis. The results show that the Coflex-F device combined with ALIF surgery can provide stability similar to the pedicle screw fixation combined with TLIF or ALIF surgery. Also, the posterior instrumentations (Coflex-F and pedicle screw fixation) combined with TLIF surgery had lower stability than when combined with ALIF surgery.

[Indexed for MEDLINE]

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