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Multi-patient finite element simulation of keeled versus pegged glenoid implant designs in shoulder arthroplasty

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Abstract

This study investigates the mechanical behaviour of keeled and pegged implant designs used in shoulder arthroplasty for the first time using multiple 3D models. Thus, this study should provide valuable insights into the preferable use of either of these two controversial implant designs. Three-dimensional models of a scapula were derived from the CT scans of five patients, and an inter-patient-specific finite element analysis with special attention to bone density and boundary conditions was carried out. A distinct decrease in the investigated parameters was evident with the pegged implant in all of the patients, specifically for the implant and the bone cement. The relevance of the stress reduction within the bone is minor, whereas the reduction in the stress of the bone cement contributes to an increase in the bone cement survival. The particular construction of the pegged implant provides better stability and therefore supports bone ingrowth. The large variations between the patients show the necessity of patient-specific simulations and the use of multiple models to derive valuable results. In the conducted inter-patient-specific FEA, the pegged glenoid implants were found to exhibit superior behaviour compared with keeled implants. The results confirm the general clinical findings and demonstrate the FEA as a valuable tool in prosthetic and orthopaedic problems.

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Acknowledgments

This project is supported by the Austrian FWF Translational Research Program L526-B05 and the PMU-FFF Rise Project R-09/03/003-SCH. The study was approved by the Ethics Committee of Salzburg, No. 415-E803/3-2007.

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Authors and Affiliations

  1. Department of Information Technology and Systems Management, Salzburg University of Applied Sciences, Puch/Salzburg, Austria

    Werner Pomwenger & Karl Entacher

  2. Department of Trauma Surgery, Salzburg University Hospital, Salzburg, Austria

    Herbert Resch

  3. Research Program in Prosthetics, Biomechanics and Biomaterials, Paracelsus Medical University, Salzburg, Austria

    Peter Schuller-Götzburg

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  1. Werner Pomwenger
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  2. Karl Entacher
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  3. Herbert Resch
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  4. Peter Schuller-Götzburg
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Correspondence to Werner Pomwenger.

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Pomwenger, W., Entacher, K., Resch, H. et al. Multi-patient finite element simulation of keeled versus pegged glenoid implant designs in shoulder arthroplasty. Med Biol Eng Comput 53, 781–790 (2015). https://doi.org/10.1007/s11517-015-1286-7

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  • DOI: https://doi.org/10.1007/s11517-015-1286-7

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