Endometrial Basal Layer Damage After Curettage: Can It Heal?

By Seungjoo Lee

Endometrial basal layer damage after curettage can be one reason for markedly lighter periods or a persistently thin endometrium. For women preparing for IVF after an abortion or miscarriage, checking for intrauterine adhesions is an important first step. Hysteroscopic treatment, prevention of recurrent scarring and hormonal support form the basic approach when appropriate; PRP and stem cell therapies still require stronger evidence.

Some women notice a clear reduction in menstrual flow after curettage following an induced abortion or miscarriage. Periods that previously lasted five days may end after only one or two days, or bleeding may become little more than spotting.

Others discover only when they begin fertility treatment that their uterine lining does not thicken readily. Damage to the endometrial basal layer is one possibility to investigate.

What is the endometrial basal layer?

The endometrium is easier to understand as two layers: the functional layer and the basal layer. The functional layer is shed during menstruation. The basal layer remains underneath and produces the new lining for the following cycle.

If the functional layer is like leaves that grow and fall each month, the basal layer is closer to the roots that produce new leaves.

A problem can arise if this deeper layer is injured while tissue is removed from the uterus after an abortion or miscarriage. Normal regeneration may become difficult when curettage of a pregnant uterus is repeated or the injury is deep.

The injured front and back walls of the uterus may adhere to one another, forming intrauterine adhesions. Adhesions accompanied by symptoms such as lighter or absent periods and infertility are commonly described as Asherman’s syndrome; severe cases may involve extensive scarring.

However, abortion or curettage does not cause basal layer damage in every patient. Nor does a thin lining, by itself, establish that the basal layer has been damaged.

Check the uterine cavity before focusing only on millimeters

If menstrual flow has fallen substantially after curettage and the lining no longer grows as it previously did, it is important to check whether adhesions have developed inside the uterus.

Ultrasound and sonohysterography may be used. Hysteroscopy is a principal method that allows clinicians both to see intrauterine adhesions directly and to treat them.

A slender camera is passed into the uterus to examine the cavity. It can show which areas have adhered and how much the cavity has narrowed.

If adhesions are found and treatment is indicated, hysteroscopic adhesiolysis is central to treatment. The clinician carefully separates the adherent tissue under direct vision to restore the uterine cavity.

One principle is especially important: indiscriminately scraping a uterus in which basal layer injury is already suspected is not the treatment. The aim is to remove adhesions precisely while preserving as much of the remaining normal endometrium as possible.

Why treatment continues after adhesions are separated

Adhesions can form again after their removal. Recurrence is a particularly important problem in severe intrauterine adhesions with extensive basal layer injury.

Postoperative approaches may include keeping a physical barrier, such as a balloon, inside the uterus for a period of time, or using a hyaluronic acid-based adhesion barrier. Estrogen may also be given to encourage the remaining endometrium to grow again.

Follow-up ultrasound or hysteroscopy is important to check whether the uterine cavity has remained open. Separating the adhesions does not mean that the endometrium has fully recovered.

What if the endometrium stays thin after adhesiolysis?

A more difficult situation arises when the lining still does not grow sufficiently after hysteroscopic removal of adhesions.

If the lining remains around 4–5 mm despite estrogen treatment, or menstrual flow does not recover, one possibility is severe basal layer injury with too little tissue remaining to regenerate the lining. This challenge has prompted research into regenerative treatments for a refractory thin endometrium.

Autologous platelet-rich plasma, or PRP, is one of the approaches being studied. A platelet-rich component is separated from the patient’s own blood and introduced into the uterus. Growth factors in platelets might help endometrial regeneration and the formation of blood vessels.

A 2026 systematic review and single-arm meta-analysis included 14 studies involving 523 patients with a thin endometrium. Endometrial thickness increased by an average of 1.61 mm from baseline after PRP treatment. The investigators emphasized limitations in the study designs and differences in treatment methods, and concluded that larger randomized controlled trials are needed. The review was conducted by researchers at Chengdu Medical College and Sichuan University in China and published in the Turkish Journal of Obstetrics and Gynecology. Read the PRP review.

A separate meta-analysis confined to patients with intrauterine adhesions found less recurrence of moderate to severe adhesions and improvements in endometrial thickness and clinical pregnancy with PRP, but no statistically significant difference in live birth. It is therefore too early to conclude that PRP can repair a damaged basal layer. Read the review of PRP after adhesiolysis.

Can stem cells regenerate the basal layer?

Researchers are also investigating whether stem cells can regenerate the endometrium in patients whose basal layer is severely damaged.

A systematic review and meta-analysis published in the European Journal of Obstetrics & Gynecology and Reproductive Biology in 2026 examined 18 clinical studies involving 323 patients with a refractory thin endometrium or Asherman’s syndrome. The team included researchers at the Kulakov National Medical Research Center for Obstetrics, Gynecology and Perinatology in Moscow.

Endometrial thickness increased by an average of 2.35 mm after mesenchymal stem cell (MSC) treatment. Some randomized trials also showed signals of improvement in clinical pregnancy and live birth.

The authors nevertheless stressed that effectiveness and safety must be established in large randomized trials before this can be recommended as an established endometrial regeneration treatment. Stem cell therapy is therefore more accurately understood as an investigational treatment than as routine standard care. Read the stem cell review.

Endometrial basal layer damage: the order of treatment matters

Seeking PRP or stem cell treatment as the first response to a thin lining after abortion or miscarriage skips an important part of the assessment.

The uterine cavity should be evaluated first. If adhesions are present, the basic approach is to remove them accurately when indicated, prevent their recurrence, and assess how the remaining endometrium responds to hormones. Adjunctive options such as PRP may be considered in refractory cases in which the lining still fails to recover.

Above all, a measurement such as 5 mm should not be treated as proof that the basal layer is damaged. Thin endometrium has multiple causes, and thickness on ultrasound cannot by itself establish the extent of basal layer injury.

Conversely, markedly lighter or absent periods after curettage following an abortion or miscarriage, together with repeated poor endometrial growth, should not simply be dismissed as a naturally thin lining.

For women preparing for in vitro fertilization (IVF), it is particularly important before embryo transfer to assess whether adhesions are present, whether the uterine cavity has been restored, and whether the remaining endometrium responds appropriately to hormones.

The basal layer is the starting point for rebuilding the lining. The goal is therefore more than adding a few millimeters to an ultrasound measurement. Preserving as much normal basal tissue as possible and restoring the cavity so that the lining can grow again are central to treating endometrial injury after abortion or curettage.

Guideline and research sources

This article is based on the joint AAGL and European Society of Gynaecological Endoscopy (ESGE) guidelines on intrauterine adhesions and recent endometrial regeneration research. The guideline identifies hysteroscopy as the most accurate diagnostic method and recommends adhesiolysis under direct hysteroscopic vision for symptomatic adhesions. It also discusses postoperative intrauterine barriers and hormonal treatment, including estrogen. Published in Gynecological Surgery in 2017; DOI: 10.1186/s10397-017-1007-3; PMID: 28603474.