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. 2023 Oct 13;59(10):1822. doi: 10.3390/medicina59101822

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Anteroposterior and axial X-rays. (A,B) preoperative; (C,D) postoperative; (E,F) 5 years follow-up. A 52-year-old male with increasing pain and immobilization 6 years after THA; progressive stress shielding distally around the stem and loosening zone according to all Gruen zones; caused by aseptic loosening stem revision from a tapered rectangular stem to an short stem; in axial view, the relatively broad shoulder region compared to the explanted stem allows sufficient bone stock and provides superior rotational stability; from the first to last follow-up even new re-ossifications of the persisting loosening zones around the mid-stem.