Evaluation of the Effectiveness of Targeted Deep Pelvic Floor Muscle Physiotherapy Compared With Standard Antenatal Perineal Massage in Reducing the Rates of Cesarean Delivery, Operative Vaginal Delivery, and Vaginal Tears in Nulliparous Women.

Perineal trauma is one of the most common complications of vaginal childbirth, occurring in up to 85% of vaginal deliveries.Perineal trauma may result in significant long-term maternal morbidity, including chronic pelvic pain, dyspareunia, urinary incontinence, fecal incontinence, and reduced quality of life. Postpartum dyspareunia remains a frequent complication after childbirth, with previous studies reporting persistent symptoms in a substantial proportion of women for up to 18 months after delivery. Obstetric interventions, including operative vaginal delivery and emergency cesarean delivery, have also been associated with an increased risk of long-term pelvic floor dysfunction and postpartum sexual pain.

The prevention of perineal trauma has therefore become an important objective in modern obstetric care. Numerous intrapartum interventions have been investigated, including warm compresses, maternal positioning, perineal support techniques, breathing exercises, lubricants, and perineal massage. Systematic reviews have demonstrated that some intrapartum interventions, particularly warm compresses and perineal massage during the second stage of labor, may reduce severe obstetric anal sphincter injuries (OASIS). Consequently, intrapartum perineal massage has been incorporated into routine clinical practice in many delivery units.

In contrast, evidence regarding antenatal perineal massage remains less convincing. Previous randomized studies and Cochrane reviews have reported little or no reduction in severe perineal tears following antenatal perineal massage, although modest reductions in episiotomy rates have been observed. These findings suggest that interventions directed exclusively at the superficial perineal tissues may not adequately address the biomechanical changes occurring during fetal descent through the birth canal.

Recent advances in pelvic floor imaging have improved understanding of the anatomical changes occurring during labor. Magnetic resonance imaging studies have demonstrated that fetal head descent is primarily associated with elongation and stretching of the deeper pelvic floor muscles, particularly the pubococcygeus and iliococcygeus muscles, while relatively little change occurs within the superficial components of the pelvic floor. Additional ultrasound studies have demonstrated associations between larger levator hiatus dimensions and more favorable labor outcomes, including shorter duration of the second stage of labor and lower rates of operative vaginal delivery. Furthermore, pelvic floor muscle physiotherapy has been shown to increase levator hiatus dimensions during Valsalva maneuver and improve pelvic floor muscle function in women with pelvic floor disorders. These findings provide the physiological rationale for targeting the deep pelvic floor musculature during pregnancy rather than focusing solely on superficial perineal tissues.

The central hypothesis of the present study is that targeted physiotherapy of the deep pelvic floor muscles before childbirth will improve tissue flexibility and neuromuscular function, facilitate fetal head descent during labor, shorten the second stage of labor, reduce operative vaginal delivery and cesarean delivery for arrest of descent, and ultimately decrease the incidence of perineal trauma compared with standard antenatal perineal massage.