Table 2.

Digitised external (cortical) and internal (trabecular) landmarks are tabulated. Letters M and L denote landmarks from the medial and lateral aspects of the ilium, respectively. Three landmark types were designated following Bookstein (1991). Type I landmarks are located at discrete juxtapositions of bones or bony eminences. Type II landmarks are defined geometrically, for example the apex of an anatomical curve. Type III landmarks are also defined geometrically by chords or fractions of curvature

No.	Landmark name	Description	Landmark type
External landmarks
C1	Anterior superior iliac spine		I
C2	Anterior thickening of iliac crestM	Point at widest section of anterior iliac crest, between tubercle and superior spine	II
C3	Anterior thickening of iliac crestL	Point at widest section of anterior iliac crest, between tubercle and superior spine	II
C4	Iliac tubercleM	Point along iliac crest opposite L5	III
C5	Iliac tubercleL	Maximum apex of tubercle	II
C6	Iliac crestM	Point along medical aspect of iliac crest where the insertion of m. obliquus internus abdominis and m. quadratus lumborum meet	II
C7	Iliac crestL	Point along medical aspect of iliac crest where the insertion of m. obliquus externus abdominis and m. latissimus dorsi meet	II
C8	Spina limitansM	Point along iliac crest where spina limitans meets iliac crest	II
C9	Lateral iliac crest (Spina limitans)L	Lateral aspect of iliac crest opposite L8	III
C10	Posterior eminence of iliac crestM	Point at widest section of posterior iliac crest	II
C11	Posterior iliac crestL	Point at widest section of posterior iliac crest	II
C12	Posterior superior iliac spine		I
C13	Posterior inferior iliac spine		I
C14	Greater sciatic notch	Deepest point of greater sciatic notch	II
C15	Dorsal ilium	Point along ischial spine where the ilium and ischium meet	II
C16	Lateral apex of acetabular rim		II
C17	Ilio-pubic eminence	The lateral border of the pelvic inlet where the ilium and pubis meet	I
C18	Anterior inferior iliac spine		I
C19	Posterior apex of auricular surface		II
C20	Posterior indent of auricular surface		II
C21	Posterior ridge of auricular surface	Ridge posterior to C16	II
C22	Superior auricular surface	Superior apex of auricular surface	II
C23	Anterior ridge of auricular surface	Ridge anterior to C16	II
C24	Anterior apex of auricular surface	Anterior apex of auricular surface	II
C25	Scalenion	Scalenion	II
C26	Inferior auricular surface	Inferior apex of auricular surface	II
Internal landmarks
T1	Superior aspect of sacro-pubic bundle	Point where anterior bundle reaches iliac crest	I
T2	Central apex sacro-pubic bundle	Point where anterior bundle reaches acetabulum	I
T3	Inferior aspect of sacro-pubic bundle	Point where posterior bundle reaches iliac crest	I
T4	Superior aspect of ilio-ischial bundle	Central apex of posterior bundle	I
T5	Inferior aspect of ilio-ischial bundle	Point where posterior bundle reaches acetabulum	I