Spine Surgery and Related Research
Online ISSN : 2432-261X
Spondylolysis repair using a pedicle screw hook or claw-hook system. -a comparison of bone fusion rates-
Ko IshidaYoichi AotaNaoto MitsugiTakashi KuniyaTakaaki MoriiTakuya KawaiKatsutaka YamadaTomoyuki Saito
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2018 Volume 2 Issue 2 Pages 135-139


Introduction: To assess the bone fusion rates and clinical results of two surgical methods (pedicle screw claw-hook fixation and pedicle screw hook fixation) of lumbar spondylolysis repair.

Methods: A multicenter database of surgical patients with lumbar spondylolysis was reviewed. All patients < 20 years old with a minimum of 6 months of follow-up and computed tomography images were included. Operation time and blood loss amount were investigated. Visual analogue scale (VAS; 0-10) scores for lower back pain were evaluated to assess clinical results.

Results: A total of 17 patients met the inclusion criteria. Pedicle screw hook fixation was performed in five patients (the hook group), and pedicle screw claw-hook fixation was performed in 13 patients (the claw-hook group). One patient was included in both groups because each method was performed at different lumbar levels (L4 and L5). The bone fusion rates at 3, 6, and 9 months after surgery were significantly higher in the claw-hook group than those in the hook group. Operation time and blood loss amount were not significantly different between the groups. VAS scores improved in the claw-hook group but not in the hook group because of a small number of patients.

Conclusions: Pedicle screw claw-hook fixation was more effective than pedicle screw hook fixation in terms of bone fusion rates.

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© 2018 The Japanese Society for Spine Surgery and Related Research. CC BY-NC-ND 4.0 (https://creativecommons.org/licenses/by-nc-nd/4.0/).
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