CT Pelvimetry

Diagnosis

CT Pelvimetry

History

Measurement

From

To

Length

Transverse diameter
(of inlet)

Between extreme lateral points of pelvic inlet

13.5-14 cm

Oblique diameter I

Right sacroiliac joint

Left iliopubic eminence

12-12.5 cm

Oblique diameter II

Left sacroiliac joint

Right iliopubic eminence

11.5-12 cm

Anatomical conjugate

Pubic symphysis

Promontory

~12 cm

True conjugate
(obsteric conjugate)

Retropubic eminence
(posterior surface
of symphysis)

Promontory

11.5 cm

Diagonal conjugate*

Inferior pubic ligament

Promontory

13 cm

Straight conjugate

Lower border of symphysis

Tip of coccyx

9.5-10 cm

Median conjugate

Lower border of symphysis

Lower border of sacrum

11.5 cm

Transverse diameter
(of midpelvis)

Bispinous

> 10 cm

Transverse diameter
(of outlet)

Between ischial tuberosities

10-11 cm

Intertrochanteric distance

Between femurs

31 cm