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. 2016 Mar 22;6:23477. doi: 10.1038/srep23477

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Copyright © 2016, Macmillan Publishers Limited

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The AOS was defined as the perpendicular distance (ab) between Lines A and B, Line A was drawn parallel to the neck axis and tangential to the convexity of the femoral head; Line B was drawn parallel to the neck axis and tangential to the concavity of the femoral neck²¹. Similarly, the POS was defined as the perpendicular distance (cd) between Lines C and D, SOS was defined as the perpendicular distance (ef) between Lines E and F, and IOS was defined as the perpendicular distance (gh) between Lines G and H. (AOS, anterior offset; POS, posterior offset; SOS, superior offset; IOS, inferior offset).