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. 2021 Apr 30;142(6):1091–1098. doi: 10.1007/s00402-021-03898-w

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Installation of the three different screw types. In group 1 (steel), the graft was secured with a central K-wire (a1). A 3.5-mm glide hole and a 2.7-mm thread hole were created using cannulated drills, in the AO technique. The graft was placed flush to the glenoid surface (a2). In group 2 (magnesium), a cannulated drill was used to create a 2.5-mm tunnel (b1). A 3.5-mm countersink was then used to create a hole for the screw head. The screw was then placed using the K-wire as guidance. Again, two screws were placed to fixate the graft flush to the glenoid surface (b2). In group 3 (PLLA), a K-wire was again used as guidance for the superior screw (c1). The superior hole was drilled using the dedicated drill until a laser mark was reached. A dilator tap was then used to create a screw thread inside the drill hole. Finally, the screws were inserted using the Bio-Compression screwdriver (c2)