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Biomechanical efficacy of a combined interspinous fusion system with a lumbar interbody fusion cage

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Abstract

An interspinous fusion system (IFS) has been introduced as an alternative to pedicle screw fixation (PSF), commonly used in spinal fusion. In this study, a finite element analysis was performed to assess biomechanical efficacy of the combined IFS with an interbody fusion cage. post-operative models were created to compare the biomechanical efficacy of IFS to that of other fixations including: Type 1, Fusion cage only; Type 2, IFS only; Type 3, PSF only; Type 4, Type 1 plus Type 2; Type 5, Type 1 plus Type 3. All device implantations were simulated at L4-5. At the operated level, Type 4 was shown to have comparable reduction in ROM (range of motion) as Type 5 with both models effectively inducing greater stability compared to other models regardless of loading type. At the adjacent level, Type 4 showed less increase in ROM than Type 5 and was closer to the pre-operative level. In terms of the COR (center of rotation) and load sharing between the anterior and posterior parts of the spine, Type 4 remained closer to that of the intact spine. These results suggest that IFS with a cage may help reduce degeneration at adjacent levels while effectively providing stability at the operated level.

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Authors and Affiliations

  1. Department of Medical Device Evaluation, Ministry of Food and Drug Safety, 303 Osongsaengmyeong 5-ro, Osong-eup, Cheongju-si, Chungcheongbuk-do, 363-954, South Korea

    Yeong-Hyeon Kim, Eun-Young Park & Guen-Woo Kang

  2. Medical Device Development Center, OSONG Medical Innovation Foundation, 123 Osongsaengmyeong ro, Osong-eup, Cheongju-si, Chungcheongbuk-do, 363-951, South Korea

    Tae-Gon Jung

  3. Development of Biomedical Engineering, College of Medicine, Chungbuk National University, 1, Chungdae-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-763, South Korea

    Kyung-Ah Kim

  4. Development of Biomedical Engineering, Inje University, 197, Inje-ro, Gimhae-si, Gyeongsangnam-do, 621-749, South Korea

    Sung-Jae Lee

Authors
  1. Yeong-Hyeon Kim
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  2. Tae-Gon Jung
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  3. Eun-Young Park
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  4. Guen-Woo Kang
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  5. Kyung-Ah Kim
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  6. Sung-Jae Lee
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Correspondence to Sung-Jae Lee.

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Kim, YH., Jung, TG., Park, EY. et al. Biomechanical efficacy of a combined interspinous fusion system with a lumbar interbody fusion cage. Int. J. Precis. Eng. Manuf. 16, 997–1001 (2015). https://doi.org/10.1007/s12541-015-0129-7

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  • DOI: https://doi.org/10.1007/s12541-015-0129-7

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