Article
Applicability of intraoperativ compressive bone testing for predicting the stability of cervical screws
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Authors
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Akos Csokonay
- Universitätsklinikum des Saarlandes, Klinik für Neurochirurgie, Homburg, Deutschland
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Joachim Oertel
- Universitätsklinikum des Saarlandes, Klinik für Neurochirurgie, Homburg, Deutschland
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Thomas Tschernig
- Universitätsklinikum des Saarlandes, Institut für Anatomie und Zellbiologie, Homburg, Deutschland
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Tanja Grobecker-Karl
- Universitätsklinikum des Saarlandes, Klinik für Zahnärztliche Prothetik und Werkstoffkunde, Homburg, Deutschland
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Matthias Karl
- Universitätsklinikum des Saarlandes, Klinik für Zahnärztliche Prothetik und Werkstoffkunde, Homburg, Deutschland
| Published: | June 18, 2018 |
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Outline
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Objective: Osteoporosis is a considerable problem in spine screwing. A new device, called BoneProbe, has been developed in dental surgery to predict intraoperative the bone quality and stability of implants. It measured the bone resistance to screw implantation. The aim of this study was to evaluate whether intraoperative compressive testing of bone using the BoneProbe can be used for predicting the stability of cervical screws.
Methods: Cervical screws were modified and used for this study. In the first part of the study, homogenous polyurethane foam blocks as bone surrogate materials were used to measure the BoneProbe value, insertion torque, damping capacity and thread cutting. In the second part of study BoneProbe and insertion torque measurements were performed in cervical spine of a human cadaver.
Results: In the first part of the study, comparisons between the bone densities showed significant differences for all parameters (BoneProbe, insertion torque, damping capacity used Periotest, thread cutting) (Figure 1 [Fig. 1]). All measurement values correlated significantly with each other (p<0,05). In the second part of the study the BoneProbe and insertion torque measurements correlated significantly with each other (p=0,0081) (Figure 2 [Fig. 2]). It was seen higher values during screwing the lateral mass compared to the laminar screw insertion.
Conclusion: The BoneProbe values show significance to other measurement values. With increase of bone density, the BoneProbe value and insertion torque also increase predicting the stability. The damping capacity shows an inverse relation to the BoneProbe. Compressive strength measurements may predict the stability of cervical screws to open up new possibilities in spine instrumentation.
