Clinical Study of i-PRF Intrauterine Perfusion for Endometrial Regeneration and Repair in Moderate to Severe Intrauterine Adhesions

Intrauterine adhesions (IUA) are caused by injury to the endometrial basal layer, usually after intrauterine procedures or infection, and may result in hypomenorrhea, amenorrhea, infertility, recurrent miscarriage, and impaired reproductive function. Hysteroscopic adhesiolysis with uterine cavity reconstruction is the standard treatment. However, for women with moderate to severe IUA, postoperative endometrial regeneration remains inadequate, re-adhesion is common, and pregnancy outcomes remain suboptimal.

Autologous platelet concentrates have shown potential in tissue repair. Previous work by the study team suggested that intrauterine platelet-rich plasma (PRP) after transcervical resection of adhesions may reduce re-adhesion and increase endometrial thickness, but the effect may be limited by rapid biologic activity loss. Injectable platelet-rich fibrin (i-PRF), a second-generation autologous platelet concentrate, remains in liquid form before administration and then rapidly forms a fibrin gel in the uterine cavity. This material may act as both a physical barrier and a biologically active scaffold, while allowing sustained release of growth factors that support tissue repair, angiogenesis, and modulation of local inflammation.

This study is a prospective randomized controlled clinical trial conducted at Beijing Obstetrics and Gynecology Hospital, Capital Medical University. The objective is to evaluate the efficacy and safety of intrauterine i-PRF perfusion after hysteroscopic adhesiolysis in women with moderate to severe IUA and to compare it with sodium hyaluronate intrauterine treatment.

Women of reproductive age with moderate to severe IUA, defined according to the Chinese diagnostic and grading standard (CSGE score >=9), who have a strong fertility desire and plan to undergo hysteroscopic adhesiolysis will be screened for enrollment. Participants who meet all eligibility criteria and provide informed consent will be randomly assigned in a 1:1 ratio to one of 2 groups.

All participants will undergo standard hysteroscopic adhesiolysis with uterine cavity reconstruction and placement of a uterine cavity balloon. In the experimental group, 3 mL of freshly prepared autologous i-PRF will be perfused into the uterine cavity through the balloon drug channel immediately after surgery and again on postoperative day 5. In the control group, 3 mL of sodium hyaluronate will be administered through the same route immediately after surgery. Both groups will also receive postoperative artificial cycle treatment and prophylactic antibiotics according to the study protocol.

The study will assess both efficacy and safety. Efficacy endpoints include postoperative uterine cavity morphology and re-adhesion rate based on second-look hysteroscopy after 2 menstrual cycles, endometrial thickness, endometrial volume, and endometrial blood flow assessed by transvaginal ultrasound during the implantation window, and clinical pregnancy outcomes during follow-up. Safety assessments include body temperature, abdominal pain, vaginal discharge, blood routine testing, coagulation-related events, and monitoring for infection or thrombotic complications.

Participants will be followed during hospitalization, within 1 month after discharge, after 2 menstrual cycles for hysteroscopic and ultrasound reassessment, and again at 6, 12, and 24 months for reproductive outcomes. The planned sample size is 200 participants, with 100 in each group.

This study aims to determine whether intrauterine i-PRF perfusion can improve endometrial regeneration and repair, reduce postoperative re-adhesion, improve endometrial receptivity and pregnancy outcomes, and provide clinical evidence for a practical and safe regenerative treatment strategy for moderate to severe IUA.