Comparison of biomechanical efficacy in balloon kyphoplasty and JACK vertebral dilator kyphoplasty
BIAN Yuan-jian1, HUANG Yong-hui1, TAN Yu-hui1, WU Yan2, ZHOU Zhi-qiang2, LI Da-peng1
（1. Department of Orthopaedic Surgery，the Affiliated Hospital of Jiangsu University, Zhenjiang Jiangsu 212001； 2. School of Medicine, Jiangsu University, Zhenjiang Jiangsu 212013，China)
Abstract：Objective: To compare the biomechanical effects of percutaneous balloon kyphoplasty (BKP) with JACK vertebral dilator kyphoplasty (DKP) on osteoporotic vertebral compression fractures (OVCFs). Methods: Twenty-four osteoporotic vertebrae specimen ranged from T11 to L2 were randomly assigned to BKP group (n=12) and DKP group (n=12). All 24 vertebrae were compressed by 25% of their initial height by material test machine (DSFW-50) to create OVCFs, and the initial extreme load, strength and stiffness were recorded. The 24 fractured vertebrae were undergone BKP or DKP accordingly. The second flexional compression fractures were experimented, and the extreme load, strength and stiffness were recorded. Results: In BKP group and DKP group, the initial extreme load was (1 609.2±160.6) N and (1 630.0±168.4) N, the strength was (9.9±1.6) MPa and (10.2±1.7) MPa, the stiffness was (1 034.8±147.3) N/mm and (1 014.2±219.7) N/mm. There were no differences between two groups (P>0.05). After kyphoplasty, the extreme load was (3 139.2±300.9) N and (3 171.2±366.2) N, the strength was (14.1±2.2) MPa and (14.4±1.7) MPa, the stiffness was (1 316.7±229.1) N/mm and (1 348.3±214.0) N/mm. And there were no differences between two groups (P>0.05). In both groups, the extreme load, strength and stiffness after kyphoplasty were increased when compared to the initial data (P<0.01). Conclusion: Both BKP and DKP can significantly strengthen fractured vertebrae and improve the biomechanical properties of the vertebral body.
2014, Vol. 24 
