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Original Articles
- Comparison of Uniportal and Biportal Vertebroplasty in Bone Cement Distribution and Leakage
- Jae Hyup Lee, Kang Sup Yoon, Seung Baik Kang, Hyunchul Jo, Sang Ki Lee, Bong Soon Chang, Choon Ki Lee, Ji Ho Lee
- J Korean Fract Soc 2006;19(4):471-476. Published online October 31, 2006
- DOI: https://doi.org/10.12671/jkfs.2006.19.4.471
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Abstract
- PURPOSE
To evaluate the differences of radiological outcomes of uniportal and biportal vertebroplasty in the point of bone cement distribution and leakage.
MATERIALS AND METHODS
A retrospective study reviewing the period between May 2002 and January 2006 investigated 100 vertebrae which underwent vertebroplasty and followed for more than three months by uniportal approach (55 vertebrae, group 1) and biportal approach (45 vertebrae, group 2). The operative time, the amount of bone cement injected, anterior vertebral height restoration, kyphotic angle, bone cement distribution, and bone cement leakage were evaluated.
RESULTS
The amount of injected bone cement of group 1 (3.9 cc) was statistically smaller than that of group 2 (5.1 cc) (p=0.016). There were no significant differences in the operative time, anterior vertebral height restoration, kyphotic angle in both groups. The rate of bone cement distribution over 8 zones was significantly higher in group 2 than in group 1 (p=0.014). However, the rate of bone cement distribution over 7 zones and the rate of bone cement distributed on whole anterior vertebral body were not significantly different in both groups. The cement leakage was not also significantly different in both groups.
CONCLUSION
Although the amount of injected bone cement was smaller in uniportal vertebroplasty, the radiological results and cement leakage were similar to biportal vertebroplasty. These findings suggest that uniportal vertebroplasty can be the operative options in osteoporotic vertebral fracture.
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- Evaluation of Osseointegration in Titanium Alloy Cortical Screws with the Passage of Time
- Jae Hyup Lee, Bong Soon Chang, Choon Ki Lee
- J Korean Fract Soc 2004;17(4):401-407. Published online October 31, 2004
- DOI: https://doi.org/10.12671/jkfs.2004.17.4.401
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Abstract
PDF - PURPOSE
To evaluate the osseointegration of titanium alloy cortical screws with the passage of time.
MATERIALS AND METHODS
Fifty four titanium alloy cortical screws (24 mm in length, 3.5 mm in diameter) were implanted bilaterally in the tibial diaphysis of adult mongrel male dogs of similar size and weight (30 +/-5 kg). The insertion torques, radiographs, undecalcified histology, histomorphometric analysis and extraction torques were evaluated at 2, 4 and 8 weeks after surgery.
RESULTS
The extraction torque at 2 weeks (1.14+/-0.470 cN. m) was significantly lower than the insertion torque (1.76+/-0.609 cN. m) (p=0.0071), the extraction torque at 4 weeks (2.57+/-1.36 cN. m) was slightly improved and the extraction torque at 8 weeks (3.18+/-0.499 cN. m) was significantly higher than insertion torque (p=0.0005). Direct bony contact in the early phase was poor and intervening fibrous tissue was observed at the bone-screw interface. However, the fixation between the bone and the screws improved with time. The percentage of bone-screw contact at 8 weeks (33.1+/-18.5%) was higher than that of 2 weeks (22.4+/-12.9%), but not statistically significant.
CONCLUSION
Because of thermal injury or pressure necrosis, the fixation strength of titanium alloy cortical screws at 2 weeks after implantation is significantly lower than that at the insertion time. So, we should keep in mind the initial phase weakness of screw fixation when we allow the patients the range of motion exercise or weight bearing and the improvement of the initial phase fixation is very important in clinical results.
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