TABLE 2.
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.