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. 2012 Jul 10;470(12):3515–3523. doi: 10.1007/s11999-012-2460-y

Fig. 4A–B.

Fig. 4A–B

(A) When acetabular abduction is α°, the distance between the inferior point of 40° abduction and the TAN (D1) is |2 × π × 52 mm × (α° − 40°) ÷ 360°| = |0.91 × (α − 40)| mm ≒ |α − 40| mm. (B) Likewise, when acetabular anteversion is β°, the distance between the anterior point of 15° anteversion and the AAN (D2) is |β − 15| mm.