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Wolff S, Adler S, Eppler E, Fischer K, Lux A, Rothkötter HJ, Skalej M. Correlation of CT-based bone mineralization with drilling-force measurements in anatomical specimens is suitable to investigate planning of trans-pedicular spine interventions. Sci Rep 2024; 14:1579. [PMID: 38238459 PMCID: PMC10796759 DOI: 10.1038/s41598-023-50204-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 12/16/2023] [Indexed: 01/22/2024] Open
Abstract
This interdisciplinary study examined the relationship between bone density and drilling forces required during trans-pedicular access to the vertebra using fresh-frozen thoraco-lumbar vertebrae from two female body donors (A, B). Before and after biomechanical examination, samples underwent high-resolution CT-quantification of total bone density followed by software-based evaluation and processing. CT density measurements (n = 4818) were calculated as gray values (GV), which were highest in T12 for both subjects (GVmaxA = 3483.24, GVmaxB = 3160.33). Trans-pedicular drilling forces F (Newton N) were highest in L3 (FmaxB = 5.67 N) and L4 (FmaxA = 5.65 N). In 12 out of 13 specimens, GVs significantly (p < 0.001) correlated with force measurements. Among these, Spearman correlations r were poor in two lumbar vertebrae, fair in five specimens, and moderately strong in another five specimens, and highest for T11 (rA = 0.721) and L5 (rB = 0.690). Our results indicate that CT-based analysis of vertebral bone density acquired in anatomical specimens is a promising approach to predict the drilling force appearance as surrogate parameter of its biomechanical properties by e.g., linear regression analysis. The study may be of value as basis for biomechanical investigations to improve planning of the optimal trajectory and to define safety margins for drilling forces during robotic-assisted trans-pedicular interventions on the spine in the future.
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Affiliation(s)
- Stefanie Wolff
- Clinic for Internal Medicine, Municipal Hospital St. Georg Leipzig, Delitzscher Straße 141, 04129, Leipzig, Germany
- Clinic of Neuroradiology, University Hospital Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Simon Adler
- Automatisation and Informatics, Harz University of Applied Sciences, Friedrichstraße 57-59, 38855, Wernigerode, Germany
- Fraunhofer Institute for Factory Operation and Automation IFF, Sandtorstraße 22, 39106, Magdeburg, Germany
| | - Elisabeth Eppler
- Institute of Anatomy, University of Bern, Baltzerstraße 2, 3012, Bern, Switzerland
- Institute of Anatomy and Cell Biology, University of Halle-Wittenberg, Große Steinstraße 52, 06108, Halle (Saale), Germany
| | - Karin Fischer
- Institute of Anatomy, Otto-von-Guericke University Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Anke Lux
- Institute of Biometry and Medical Informatics, Otto-von-Guericke University Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Germany
| | - Hermann-Josef Rothkötter
- Institute of Anatomy, Otto-von-Guericke University Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Martin Skalej
- Clinic of Neuroradiology, University Hospital Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany.
- Neuroradiology, Martin-Luther-University Halle-Wittenberg, Ernst-Grube-Straße 40, 06120, Halle (Saale), Germany.
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