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Precision of computer-assisted core decompression drilling of the femoral head

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Abstract

Introduction: Osteonecrosis of the femoral head is a local destructive disease with progression into devastating stages. Left untreated it mostly leads to severe secondary osteoarthrosis and early endoprosthetic joint replacement. Core decompression by exact drilling into the ischemic areas can be performed in early stages according to Ficat or ARCO. Computer-aided surgery might enhance the precision of the drilling and lower the radiation exposure time of both staff and patients. The aim of this study was to evaluate the precision of the fluoroscopically based VectorVision® navigation system in an in vitro model. Materials and methods: Thirty sawbones were prepared with a defect filled up with a radiopaque gypsum sphere mimicking the osteonecrosis. Twenty sawbones were drilled by guidance of an intraoperative navigation system VectorVision® (BrainLAB, Munich, Germany) and 10 sawbones by fluoroscopic control only. Results: No gypsum sphere was missed. There was a statistically significant difference regarding the three-dimensional deviation (Euclidian norm) as well as maximum deviation in x-, y- or z-direction (maximum norm) to the desired mid-point of the lesion, with a mean of 0.51 and 0.4 mm in the navigated group and 1.1 and 0.88 mm in the control group, respectively. Furthermore, significant difference was found in the number of drilling corrections as well as the radiation time needed: no second drilling or correction of drilling direction was necessary in the navigated group compared to 1.4 in the control group. The radiation time needed was less than 1 s compared to 3.1 s, respectively. Conclusion: The fluoroscopy-based VectorVision® navigation system shows a high feasibility of computer-guided drilling with a clear reduction of radiation exposure time and can therefore be integrated into clinical routine. The additional time needed is acceptable regarding the simultaneous reduction of radiation time.

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Acknowledgments

The authors would like to thank the BrainLAB Company (Heimstetten, Germany) for providing the VectorVision® navigation system.

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Authors and Affiliations

  1. Orthopaedic Clinic of the University of Regensburg, Asklepios Klinik Bad Abbach, Kaiser-Karl-V-Allee 3, 93077, Bad Abbach, Germany

    J. Beckmann, J. Goetz, H. Baethis, T. Kalteis, J. Grifka & L. Perlick

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  1. J. Beckmann
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  2. J. Goetz
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  3. H. Baethis
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  4. T. Kalteis
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  5. J. Grifka
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  6. L. Perlick
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Correspondence to J. Beckmann.

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Beckmann, J., Goetz, J., Baethis, H. et al. Precision of computer-assisted core decompression drilling of the femoral head. Arch Orthop Trauma Surg 126, 374–379 (2006). https://doi.org/10.1007/s00402-006-0155-0

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