Obstetric injury to the levator ani muscle, particularly puborectalis avulsion, is a frequent yet long underrecognized consequence of vaginal childbirth. The levator ani complex plays a central role in pelvic organ support, continence, sexual function, and pelvic floor stability. Excessive distension during vaginal delivery – especially during the second stage of labor – may exceed the physiological limits of the muscle, leading to irreversible structural damage.
Advances in pelvic floor imaging, notably 3D transperineal ultrasound and magnetic resonance imaging, have established levator ani avulsion as a common and clinically relevant entity. These injuries are strongly associated with operative vaginal delivery, prolonged second stage of labor, fetal macrosomia, and increasing maternal age. Although symptoms may be absent or subtle in the early postpartum period, levator ani avulsion and persistent levator hiatal ballooning are now recognized as independent risk factors for pelvic organ prolapse and for recurrence after conventional prolapse surgery.
The clinical consequences of levator ani injury extend beyond prolapse and include defecatory dysfunction, fecal and urinary incontinence, sexual dysfunction, pelvic or perineal pain, and impaired physical activity. Because symptoms may be delayed or non-specific, these injuries remain frequently underdiagnosed. Diagnosis relies on a structured clinical assessment integrating detailed obstetric history, systematic pelvic floor examination, and targeted imaging to confirm suspected structural defects and define their extent.
Management depends on the severity of injury and symptom burden. Conservative treatment, particularly pelvic floor muscle training, remains the first-line approach in women with mild symptoms or partial injury and aims to improve compensatory function. However, current evidence shows that conservative treatment does not restore anatomical continuity in cases of complete puborectalis avulsion. In carefully selected patients with persistent, clinically significant symptoms and imaging-confirmed complete avulsion, anatomical surgical repair may be considered.
The development of an anatomically driven surgical repair targeting the levator ani muscle complex represents a paradigm shift in pelvic floor surgery. Rather than compensating for secondary support defects, this approach seeks to restore muscular continuity and physiological force transmission. Early clinical series suggest functional improvement in selected patients, although long-term outcomes and optimal indications require further evaluation.
Finally, improved recognition of levator ani injury has important implications for education and training. Accurate diagnosis, appropriate patient selection, and safe management require advanced understanding of pelvic floor anatomy, biomechanics, and imaging.
This thesis provides an integrated overview of current knowledge on obstetric levator ani injury and aims to contribute to better recognition, counseling, and care of women affected by childbirth-related pelvic floor trauma.
