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[Cement augmentation on the spine : Biomechanical considerations].
J P Kolb1, L Weiser1, R A Kueny2
1Abteilung für Unfall-, Hand- und Wiederherstellungschirurgie, Universitätsklinikum Hamburg-Eppendorf, Martinistraße 52, 20246, Hamburg, Deutschland.
Der Orthopade
|July 22, 2015
Summary
Modified cement compounds can reduce the risk of adjacent fractures after osteoporotic vertebral fracture treatment. Screw augmentation with cement, especially using perforated screws, enhances biomechanical stability and withdrawal force.
Area of Science:
- Orthopedics and Biomechanics
- Spine Surgery
- Osteoporosis Management
Background:
- Osteoporotic vertebral compression fractures are highly prevalent.
- Vertebroplasty and screw augmentation have revolutionized osteoporotic fracture management.
Purpose of the Study:
- To investigate biomechanical characteristics of adjacent fracture risk.
- To evaluate novel treatment modalities for osteoporotic vertebral fractures.
- To compare cement augmentation (vertebroplasty) and screw augmentation.
Main Methods:
- Tested 18 human osteoporotic lumbar spines (L1-5) adjacent to vertebroplasty sites.
- Utilized standard and modified low-strength cement compounds.
- Performed pull-out and fatigue tests on pedicle screws with and without cement augmentation.
Main Results:
- Cement augmentation increased biomechanical stability but altered vertebral stiffness, risking adjacent fractures.
- A modified, less firm cement significantly reduced adjacent fracture risk.
- Screw augmentation with cement increased withdrawal force; perforated screws showed highest fatigue stability.
Conclusions:
- Cement augmentation significantly alters biomechanical properties of the spine.
- Increased stability differences between vertebrae heighten adjacent fracture risk.
- Modified cement compounds and specialized screws can mitigate risks and enhance stability.
