From the article you posted, here is the last ditch effort when all else fails:
“Symphysiotomy is only recommended when all other techniques have failed7,27,35,37. In fact, Menticoclou18 states that it should be applied only after 5 minutes if the dystocia has not been solved yet and the other maneuvers, even the Zavanelli, have failed. It has been used as a last resort. It involves the surgical division of the fibrous tissue and cartilage7 of the pubic symphysis7,35,37 in order to increase the pelvic diameters7,35. However, it should be avoided because the separation of the pubic symphysis is not restored and has been related to complications such as bladder, urethral and vaginal injury. These injuries could lead later to urinary incontinence, chronic pelvic pain, and unstable pelvis7,35,37.”
I wonder which maneuvers were attempted— this last one sounds horrible, what a choice to have to make between the baby’s life or those profound injuries to the mother.