골시멘트로 보강한 척추경 나사못의 고정력에 대한 생역학적 연구A Biomechanical Study on the Pull-Out Strength of Pedicle Screw Augmented with Polymethylmethacrylate(PMMA)- Cadaveric Study -
- Authors
- 장지수; 이상호; 김경태; 김병수; 이원복
- Issue Date
- Jan-2002
- Publisher
- 대한신경외과학회
- Keywords
- Pedicle screw· Augmented with PMA· Pull-out strength.; Pedicle screw· Augmented with PMA· Pull-out strength.
- Citation
- 대한신경외과학회지, v.31, no.1, pp 45 - 49
- Pages
- 5
- Journal Title
- 대한신경외과학회지
- Volume
- 31
- Number
- 1
- Start Page
- 45
- End Page
- 49
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/66020
- ISSN
- 2005-3711
1598-7876
- Abstract
- Objective:The authors evaluate the differences in the pedicle screw pull-out strength between an unaugmented screw and a screw augmented by high pressurized PMMA in an embalmed human lumbar cadaveric spine.
Methods:Pedicle screws were inserted in the 50 pedicles of cadaver lumbar spine after measuring the bone mineral density(BMD) of the specimens. The pedicle screw was inserted without augmentation on the left pedicle and with augmentation by a vertebral reconstruction with high pressurized PMMA on the right side. The pedicle screw was inserted before the hardening of bone cement on the right side. A computed tomographic scan was done to evaluate the location of the PMMA and PMMA/screw interface. After that, a screw pullout strength test was performed.
Results:There were positive correlations between the pull-out strength and BMD in the control group(r=0.7339). The average pull-out strength of the augmented group was 168% greater than that of the control group(p<0.05). The pull-out strength of the augmented group was correlated with in the volume of the PMMA.
Conclusion:A pedicle screw that is augmented with PMMA will provide a more rigid fixation than that of an unaugmented screw, especially in the low BMD group of the specimens.
Key words:Pedicle screw;Augmented with PMMA;Pull-out strength.
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