Normal vaginal delivery

Obstructed labor

TD (cm)

OC (cm)

ISD (cm)

TD (cm)

OC (cm)

ISD (cm)

MRI—Zaretsky (2005) [18]

13.0

11.9

11.9

12.8

11.5

11.3

MRI—Keller (2003) [37]

13.0

12.2

11.2

12.4

11.4

10.5

MRI—Sporri (2002) [38]

12.5

11.8

10.7

12.1

10.8

9.6

laborPro^TM

13.2

12.8

9.4

13.1

13.1

8.9