Biomechanical properties of bone cement injectable canulated pedicle screw

doi:10.3969/j.issn.2095-4344.2015.39.014

Abstract

Abstract:

BACKGROUND: Bony and structural feature often cause pullout strength decrease of pedicle screw, which induces loosening and pullout, and finally results in fixation failure. Thus, it is very important to elevate the stability of pedicle screw.
OBJECTIVE: To detect the biomechanical stability of bone cement injectable canulated pedicle screw, and to provide reference for bone cement dosage.
METHODS: We selected T₁₁-L₄ samples of seven fresh adult corpses, containing 40 vertebral bodies. They were randomly divided into bone cement injectable canulated pedicle screw group and DTPS^TM pedicle screw group (n=20). After screw implantation, 1, 2, 3 and 5 mL bone cement was injected. The diffuse distribution of bone cement was observed by imaging. The maximum axial pullout strength was measured.
RESULTS AND CONCLUSION: When the dose of bone cement was 1-3 mL, the average maximum axial pullout strength was significantly greater in the bone cement injectable canulated pedicle screw group than in the DTPS^TM pedicle screw group (P < 0.05). When the bone cement dosage was 5 mL, no significant difference in the maximum axial pullout strength was detected between the two groups (P > 0.05). The regression equation was Y=25.269X+133.681 (R²=0.837) in the bone cement injectable canulated pedicle screw, and Y=32.039X+99.251 (R²=0.936) in the DTPS^TM pedicle screw group. When the dosage of bone cement was 1-5 mL, the maximum axial pullout strength was highly positively correlated with bone cement dosage (|R| > 0.8). These results suggested that bone cement augmentation pedicle screw could apparently elevate the stability of the screw. The maximum axial pullout strength of the pedicle screw was positively correlated with bone cement dosage. After reaching the satisfactory fixation effects, the bone cement injectable canulated pedicle screw can reduce bone cement dosage, diminish the risk of bone cement leakage, and have more advantages than DTPS^TM pedicle screw.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Bone Nails, Bone Remodeling, Biomechanics, Bioprosthesis

CLC Number:

R318

Long Hai-bin, Sun Gui-sen, Wang Wei-guo. Biomechanical properties of bone cement injectable canulated pedicle screw[J]. Chinese Journal of Tissue Engineering Research, doi: 10.3969/j.issn.2095-4344.2015.39.014.

Figures/Tables 4

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