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. 2021 Dec 29;177(4):690–707. doi: 10.1002/ajpa.24466

TABLE 2.

Landmark definitions and configurations used

Landmark definitions Right Midsagittal Left A B C D E F G H
S1 Sacrum Pelvic inlet Inlet+ sacrum+crest inlet+S1+ crest Inlet+ sacrum S1+ curve segments S1+inlet segment
Sacral promontorium LM01
Posterior point of the superior sacral articular surface on the midsagittal plane LM02
Most lateral point of the sacral articular surface LM03 LM04
Midpoint at the root of the articular process, on the posterior aspect of the sacral base LM05 LM06
Point at the corner of the first sacral foramen obtained at the intersection between the line passing for its highest point and that passing from its medial aspect LM07 LM08
Point (on the linea transversa) between S1 and S2 on the midsagittal plane LM09
The most caudal point of the ventral aspect of the sacrum on the midsagittal plane LM10
Most cranial point of the auriculum (on the ilium) LM11 LM19
The anteriormost point of the auriculum on the linea terminalis LM12 LM20
The most lateral point of the pelvic inlet along the linea terminalis LM13 LM21
The most anterior superior point of the internal aspect of the pelvic inlet at the pubic symphysis (end of the linea terminalis) LM14 LM22
Posterior superior iliac spine LM15 LM23
Posterior inferior iliac spine LM16 LM24
Anterior superior iliac spine LM17 LM25
The most lateral point on the outer aspect of the iliac crest LM18 LM26
Linea terminalis, curve semilandmarks CV1 SLM1 CV4 SLM1
CV1 SLM2 CV4 SLM2
CV1 SLM3 CV4 SLM3
CV1 SLM4 CV4 SLM4
CV1 SLM5 CV4 SLM5
Midline of the iliac crest, curve semilandmarks CV2 SLM1 CV5 SLM1
CV2 SLM2 CV5 SLM2
CV2 SLM3 CV5 SLM3
CV2 SLM4 CV5 SLM4
CV2 SLM5 CV5 SLM5
CV2 SLM6 CV5 SLM6
CV2 SLM7 CV5 SLM7
CV2 SLM8 CV5 SLM8
CV2 SLM9 CV5 SLM9
Midsagittal line of the sacrum, curve semilandmarks CV3 SLM1
CV3 SLM2
CV3 SLM3
CV3 SLM4

Note: A, B, C, E, F, G, and H refer to the configurations presented in Figure 3.

Abbreviations: CV SLM, curve semilandmark; LM, landmark; S1, first sacral vertebra.