Table S5.

Definition of fixed LMs

LM number	Description
1–2	Pubic symphysis: superior-most anterior point
3–4	Pubic symphysis: superior-most posterior point
5–6	Ischiopubic juncture: pubis posterior fusion point
7–8	Ischiopubic juncture: ischium posterior fusion point
9–10	Ischiopubic juncture: pubis–obturator foramen inferior fusion point
11–12	Ischiopubic juncture: ischium–obturator foramen inferior fusion point
13–14	Ischiopubic juncture: pubis–obturator foramen superior fusion point
15–16	Ischiopubic juncture: ischium–obturator foramen superior fusion point
17–18	Ischium: posterior-most point (superior from ischial tuberosity)
19–20	Ischium: inferior-most midpoint
21–22	Ilioischial juncture: ischium fusion point
23–24	Ilioischial juncture: ilium fusion point
25–26	Ilioischial juncture: ischium–acetabulum lateral fusion point
27–28	Ilioischial juncture: ilium–acetabulum lateral fusion point
29–30	Acetabulum: superior-most lateral point
31–32	Acetabulum: point on pubic part of lunate surface
33–34	Iliopubic juncture: pubis superior fusion point
35–36	Iliopubic juncture: ilium superior fusion point
37–38	Iliopubic juncture: pubis fusion point on pelvic brim
39–40	Iliopubic juncture: ilium fusion point on pelvic brim
41–42	Pubis: anterior midpoint
43–44	Acetabulum: inferior-most lateral point on lunate surface
45–46	Acetabulum: deepest point on acetabular center (acetabular fossa)
47–48	Pelvic brim and sacroiliac joint: intersection point
49–50	Sacroiliac joint: superior-most point
51	S1: superior-most anterior point
52	S1: superior-most posterior point
53	S1: anterior midpoint
54	S2: anterior midpoint
55	S3: anterior midpoint
56	S4: anterior midpoint
57–58	Anterior superior iliac spine
59–60	Iliac crest: posterior most point (end point)
61–62	Posterior inferior iliac spine
63	S5: anterior midpoint