摘要Objective: To compare the biomechanical properties of bilateral puncture PVP and unilateral curved PVP. Methods: Twenty old sheep spine models were taken as research specimens in this experiment, which were randomly divided into control group and experimental group, with 10 in each group. The specimens were made into a compressive spinal fracture model and treated with bone cement for vertebroplasty. In the control group, 1.5 ml of bone cement was injected into one side through bilateral puncture PVP. In the experimental group, a total of 3 ml of bone cement was injected through the unilateral curved PVP. The exudation of bone cement was observed and a CT examination was performed. Mechanical experiments were performed on the two groups of experimental specimens, and the compressive strength and stiffness of the two groups were counted and compared. Results: The initial height of the spine in the experimental group and the control group were (18.52±0.84) mm and (18.42±0.86) mm, respectively, and the difference was not statistically significant (P>0.05). After compression, the height of the vertebral bodies decreased significantly in both groups. With (10.36±2.33) mm in the experimental group and (10.51±2.41) mm in the control group, the difference was statistically significant (P<0.05) compared with that before compression, and there was no significant difference between the groups (P>0.05). After the PVP operation of the two groups, there was no bone cement exudation. The specimens in the control group had an ultimate compressive strength of (1752.52±55.21) N and a stiffness of (208.51±11.02) Nwm/m. The compressive strength and stiffness of the experimental group after PVP were: (3052.51±85.24) N, (235.25±10.35) Nwm/m. The difference was significant compared with the control group (P>0.05). Conclusion: The use of PVP in the treatment of spinal osteoporotic compression fractures can effectively increase the compression resistance of the spine while restoring the anatomical structure of the spine, so mechanical requirements are met, and the surgical method is safe. Implementation of bone cement injection using unilateral curvature of the spine can result in better spinal compression resistance, which has high promotion and application value.
Abstract：Objective: To compare the biomechanical properties of bilateral puncture PVP and unilateral curved PVP. Methods: Twenty old sheep spine models were taken as research specimens in this experiment, which were randomly divided into control group and experimental group, with 10 in each group. The specimens were made into a compressive spinal fracture model and treated with bone cement for vertebroplasty. In the control group, 1.5 ml of bone cement was injected into one side through bilateral puncture PVP. In the experimental group, a total of 3 ml of bone cement was injected through the unilateral curved PVP. The exudation of bone cement was observed and a CT examination was performed. Mechanical experiments were performed on the two groups of experimental specimens, and the compressive strength and stiffness of the two groups were counted and compared. Results: The initial height of the spine in the experimental group and the control group were (18.52±0.84) mm and (18.42±0.86) mm, respectively, and the difference was not statistically significant (P>0.05). After compression, the height of the vertebral bodies decreased significantly in both groups. With (10.36±2.33) mm in the experimental group and (10.51±2.41) mm in the control group, the difference was statistically significant (P<0.05) compared with that before compression, and there was no significant difference between the groups (P>0.05). After the PVP operation of the two groups, there was no bone cement exudation. The specimens in the control group had an ultimate compressive strength of (1752.52±55.21) N and a stiffness of (208.51±11.02) Nwm/m. The compressive strength and stiffness of the experimental group after PVP were: (3052.51±85.24) N, (235.25±10.35) Nwm/m. The difference was significant compared with the control group (P>0.05). Conclusion: The use of PVP in the treatment of spinal osteoporotic compression fractures can effectively increase the compression resistance of the spine while restoring the anatomical structure of the spine, so mechanical requirements are met, and the surgical method is safe. Implementation of bone cement injection using unilateral curvature of the spine can result in better spinal compression resistance, which has high promotion and application value.
CHEN Tian-shun, OU Qing-bin. Biomechanical Properties of Bilateral Puncture PVP and Unilateral Curved PVP[J]. 中国生物医学工程学报(英文版）, 2022, 31(2): 56-63.
CHEN Tian-shun, OU Qing-bin. Biomechanical Properties of Bilateral Puncture PVP and Unilateral Curved PVP. Chinese Journal of Biomedical Engineering, 2022, 31(2): 56-63.
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