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Robert F. Heary, Naresh K. Parvathreddy, Zainab S. Qayumi, Naiim S. Ali and Nitin Agarwal

radiolucent carbon fiber and PEEK implants, such evaluations are limited when using radiopaque, or titanium, implants (given the artifacts produced by the titanium). 9 Diedrich et al. have indicated that with MRI analysis, it is possible to differentiate between atrophic tissue and bony fusion within PEEK and carbon fiber cages, while such differentiation is impossible within metal cages. 14 FIG. 6. Conventional radiograph, lateral view, showing CFRP cage implanted at the T-2 vertebral level. Morselized bone graft was packed into the cage prior to implantation

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Timothy C. Ryken, Robert F. Heary, Paul G. Matz, Paul A. Anderson, Michael W. Groff, Langston T. Holly, Michael G. Kaiser, Praveen V. Mummaneni, Tanvir F. Choudhri, Edward J. Vresilovic and Daniel K. Resnick

may result in more settling and fragmentation (quality of evidence, Class III; strength of recommendation, D). Carbon fiber cages are recommended for arthrodesis after ACDF with fusion rates > 50% (quality of evidence, Class III; strength of recommendation, D). The use of PMMA is not recommended as a means to preserve interspace height after anterior discectomy. Although short-term results are similar to those obtained with bone grafts, fusion generally does not occur when PMMA is used as a spacer, and the long-term consequences have not been described (quality of

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Robert F. Heary and Reza J. Karimi

completed, attention is directed toward the placement of the structural interbody strut graft. We routinely use a lordotic-shaped carbon fiber cage, which is filled with morcelized autologous bone graft. A distractor is placed between the pedicle screws on the concave side of the coronal deformity. With distraction between these screws, the cage is impacted into the disc space. Following impaction to the appropriate depth, the distractors are released, the VBs recoil, and the unilateral cage serves to maintain the coronal curve correction that has been achieved. The