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. 2021 Aug 3;22:31. doi: 10.1186/s10195-021-00594-8

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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. 8 — Far left, the helical blade has been inserted correctly so that the orientation of the recess on the side of the helical blade docks with the locking prong correctly and allows the set screw to be seated fully. Pictured middle, with an under-inserted helical blade, this recess is no longer aligned with the trajectory of the set screw. In this scenario, the set screw will advance until the lock prong contacts the superior aspect of the blade/screw resulting in deformation. Pictured right, a comparison of an intact locking prong and a deformed locking prong