Which maneuver is known to assist in resolving shoulder dystocia by improving pelvic dimensions?

The all fours position, often referred to as a "hands-and-knees" position, is recognized for its ability to help resolve shoulder dystocia by enhancing pelvic dimensions and facilitating fetal descent. This position allows for gravity to assist in the birth process and can create more space in the pelvic inlet, potentially alleviating the impaction of the shoulders.

By adopting this position, the mother can alter the angle of her pelvis, which can be particularly beneficial when shoulder dystocia occurs, as it helps to increase the available space for the fetal shoulders to maneuver through the birth canal. This maneuver is especially useful in cases where traditional techniques have not succeeded, allowing the healthcare provider to try a less invasive approach.

The other techniques listed serve different purposes or address the situation in other ways and may not directly influence the pelvic dimensions to the same extent as the all fours position. Each maneuver has its role depending on the specific circumstances of the delivery, but the all fours position stands out for its direct impact on improving pelvic dimensions during shoulder dystocia management.