10/18/2026
This is one of the most important findings in prolapse research, and almost no one outside clinical circles knows it exists.
WHAT IT ACTUALLY IS: your pelvic floor isn't one muscle, it's three working together: the puborectalis, pubococcygeus, and iliococcygeus (collectively called the levator ani).
AVULSION means one of these, usually the puborectalis, tears completely away from its attachment point on the p***c bone during childbirth. It's described directly as a "macroscopic visible tear," not a strain or stretch, an actual detachment.
HOW COMMON IS IT? Far more than most women realize. It occurs in 10-36% of women after their first vaginal delivery. And here's what makes it so dangerous from an awareness standpoint: it happens occultly, meaning silently, undetected at the time it occurs.The biggest risk factor isn't what most people assume. Forceps delivery dramatically increases this risk, and research found vacuum-assisted birth increases the odds by 31%. One review noted forceps carries a notably higher risk than vacuum extraction specifically
Here's the part that should reframe entire conversations about "recovery": unlike bone injuries or swelling after childbirth, which do heal, research using MRI found women do NOT fully recover from levator ani injuries. And critically, this damage often doesn't cause symptoms right away; researchers note these injuries can take years to manifest, meaning a woman can feel completely fine after birth and still be carrying structural damage that surfaces as prolapse a decade or more later.
WHY THIS ONE INJURY MATTERS SO MUCH: avulsion is described as a major factor in the development of cystocele and uterine prolapse specifically, and separately, it significantly increases the risk of prolapse recurrence after reconstructive surgery. This single, undiagnosed injury connects directly back to several of the surgical recurrence topics we've already covered.
Unilateral (one-sided) tears have their own distinct signature. When only one side tears, research found it creates measurable asymmetry in the pelvic floor opening itself, even though the uninjured side is still intact and functioning.
The takeaway, and why this deserves to be talked about far more than it is:
this is a physical, visible injury, not a vague "weakening" that happens slowly over time. It happens in a single moment during delivery, for a meaningful percentage of women, is rarely diagnosed at the time, and can quietly shape pelvic health for decades afterward. If postpartum checks included systematic screening for this, which some researchers are actively advocating for, it could change how early prolapse risk gets identified.
Follow Herpremiumhealth for evidence-based pelvic health education series
Educational content only.
Sources:
"Obstetric risk factors for levator ani muscle avulsion: A systematic review and meta-analysis," European Journal of Obstetrics & Gynecology and Reproductive Biology, 2024
"A review of levator ani avulsion after childbirth: Incidence, imaging and management," ScienceDirect
"Pelvic floor muscle trauma," Dietz, H.P., Expert Review of Obstetrics & Gynecology
"The levator ani muscle and its involvement in childbirth," Mutua Terrassa, Pelvic Floor Ultrasound Unit
Dietz, H.P., "Avulsion of the puborectalis muscle is associated with asymmetry of the levator hiatus," Ultrasound in Obstetrics & Gynecology, 2011