AI Article Synopsis
- The study aims to compare three methods for estimating the pull-out strength of spinal fusion hardware using human cadaveric vertebrae.
- The strongest correlation with pull-out force was found with cancellous bone density assessed by QCT, followed closely by DXA, while T2*-relaxation time and cortical bone density showed a weaker relationship.
- The results suggest that techniques like QCT and DXA are the most effective for preoperatively estimating screw fixation strength.
Article Abstract
Purpose: To compare three techniques with regards to their ability to estimate pull out strength of spinal fusion hardware.
Material And Methods: VDS-screw fixation strength in 50 human cadaveric vertebral bodies was approximated by means of pull out force measurement. Bone quality was assessed by Dual X-ray Absorptiometry (DXA). Quantitative Computed Tomography (QCT) and T2*-relaxation time. For each of these techniques, correlation with axial pull out force strength was investigated.
Results: Highest correlation was found for cancellous bone density measured by QCT (r = 0.72; p < 0.001). Immediately followed by DXA (r = 0.70; p < 0.001), which involves all bone components. Inverted T2*-relaxation time (r = 0.55; p < 0.001) and cortical bone density (QCT) correlated just slightly with pull-out force strength.
Conclusions: Absorptiometrical techniques like QCT and DXA are most appropriate to estimate VDS-screw fixation strength preoperatively.
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| http://dx.doi.org/10.1055/s-2007-1015472 | DOI Listing |
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