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. 2023 Sep 25;17(5):385–403. doi: 10.1177/18632521231203009

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© The Author(s) 2023

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 12. — Diagram depicting hinge abduction. By Stage IIb or IIIa the femoral head may be deformed (a) and on attempting to abduct the hip (red arrow) the deformed femoral head may impinge on the acetabular margin and hinge on it such that the joint opens medially (b), creating a crescentic joint space. If the hinge abduction is reducible (c) a shelf acetabuloplasty is a recommended option (d). If the hinge abduction is irreducible (e), the hip is adducted (green arrow) and the position of maximum congruence is identified (f) and a proximal femoral valgus osteotomy is performed (g).