Lysis of adhesions is a surgical procedure that cuts apart bands of scar tissue (called adhesions) that have formed between organs or tissues inside the abdomen or pelvis. These fibrous bands can develop after nearly any abdominal surgery, and when they cause problems like bowel obstruction, chronic pain, or infertility, surgically dividing them is often the most effective treatment.
How Adhesions Form
Whenever tissue inside your abdomen is disturbed, whether by surgery, infection, or inflammation, your body launches a healing response that involves blood clotting, inflammation, and the deposit of a protein called fibrin. Normally, your body breaks down excess fibrin as healing wraps up. But when that cleanup process falls behind, fibrin deposits harden into permanent bands of scar tissue that connect surfaces that shouldn’t be connected. Two loops of intestine might stick together, or the bowel might attach to the abdominal wall.
The numbers are striking: adhesions develop after an estimated 93 to 100% of upper abdominal surgeries and 67 to 93% of lower abdominal surgeries. Most people with adhesions never know they have them. Problems only arise when the bands pull on organs, kink the intestine, or trap reproductive structures.
Why the Procedure Is Needed
Adhesions cause trouble in a few distinct ways, and each one can become a reason for surgical lysis:
- Small bowel obstruction. Adhesions are the most common cause. The scar bands can twist or compress the intestine, blocking food and fluid from passing through. This can become a surgical emergency if the blood supply to the bowel is compromised.
- Chronic abdominal or pelvic pain. Adhesions can tether organs in unnatural positions, creating pulling sensations or persistent pain that doesn’t respond to other treatments.
- Infertility. In the pelvis, adhesions can wrap around the fallopian tubes or ovaries, physically preventing an egg from reaching the uterus.
- Complicated repeat surgery. When a surgeon needs to operate in an area filled with dense scar tissue from a prior procedure, they first have to clear the adhesions to safely access the surgical site.
For acute bowel obstruction or perforation, surgery is typically urgent. For chronic pain or infertility, lysis of adhesions is usually planned as an elective procedure after other options have been considered.
Why Adhesions Are Hard to Diagnose
One frustrating aspect of adhesions is that imaging tests like CT scans, X-rays, and MRIs generally cannot see them directly. The scar bands are too thin and blend in with surrounding soft tissue. What imaging can detect are the consequences of adhesions, particularly intestinal obstruction. A CT scan can pinpoint where the bowel is blocked, how severe the blockage is, and whether surgery is necessary. In some cases, doctors use X-rays with a water-soluble contrast liquid that makes the digestive tract more visible and can even help relieve a partial obstruction on its own.
Because adhesions themselves are invisible on scans, diagnosis often relies on a combination of your surgical history, symptoms, physical exam, and the process of ruling out other causes.
Open vs. Laparoscopic Surgery
Lysis of adhesions can be performed through open surgery (a larger incision), laparoscopy (several small incisions with a camera), or robotic-assisted techniques. Each has trade-offs.
Open surgery, or laparotomy, has long been the standard approach. It gives the surgeon a wide view of the entire abdomen, makes it easier to inspect the full length of the bowel, and allows safer handling of dense or widespread adhesions. Minimally invasive approaches are generally associated with shorter hospital stays, less postoperative pain, and potentially fewer new adhesions forming afterward.
However, a randomized clinical trial (the LASSO trial) comparing laparoscopic and open adhesiolysis for small bowel obstruction found that at five years, laparoscopy was not superior to open surgery in terms of obstruction recurrence, incisional hernia rates, or quality of life. The researchers noted that laparoscopy may still be a reasonable choice for select patients where a single adhesive band is expected, but open surgery remains a solid option with comparable long-term results.
Risks and Complications
The primary risk during lysis of adhesions is accidental injury to the bowel. Scar tissue can be so tightly fused to the intestinal wall that separating the two sometimes causes a tear or requires removing a section of bowel. A large analysis of over 8,500 patients found that some form of bowel intervention (a tear needing repair, or a segment needing removal) occurred in about 43% of open procedures and 54% of laparoscopic procedures. Those numbers reflect the nature of the disease rather than surgical error. When adhesions are dense and mature, there is no completely risk-free way to divide them.
Other potential complications include bleeding, infection, and the possibility that new adhesions will form in the areas where surgery was performed, since the procedure itself creates the same kind of tissue disruption that causes adhesions in the first place.
Recovery Timeline
Recovery depends heavily on whether the surgery was open or minimally invasive and how extensive the adhesions were. For laparoscopic procedures, some patients go home within two days if they can eat soft foods, manage pain with oral medication, pass gas or have a bowel movement, and walk independently. Open surgery typically requires a longer stay, with averages ranging from about 3.5 days under enhanced recovery protocols to as long as two weeks for more complex cases.
You can expect to be encouraged out of bed the day after surgery, with a goal of walking for at least two hours that first day. Follow-up visits are commonly scheduled around one week and three weeks after the procedure. Returning to normal activity and work depends on the extent of surgery, but most people need several weeks before resuming physically demanding tasks.
Adhesion Recurrence
One of the most important things to understand about lysis of adhesions is that the problem can come back. Surgery to remove scar tissue creates new tissue trauma, which can trigger the same cycle of inflammation and fibrin buildup that caused the original adhesions. This is a well-recognized limitation of the procedure. For chronic pain, symptom relief does not always correlate with how thoroughly adhesions were divided, which makes the decision to operate for pain alone more nuanced than for a clear-cut bowel obstruction.
Preventing New Adhesions
Surgeons can use barrier products during the procedure to reduce the chance of new adhesions forming. These work by physically separating healing tissue surfaces during the critical first days after surgery, then dissolving on their own.
The main types include thin films made from materials like oxidized cellulose or hyaluronic acid blends, which are placed directly over the surgical site. Sprayable or injectable gels made from similar materials offer another option, particularly useful for hard-to-reach areas where a flat film won’t conform well. All of these barriers are designed to be absorbed by the body over time, so they don’t need to be removed later. While they reduce adhesion formation, no barrier eliminates the risk entirely.
Minimally invasive surgical techniques also help by causing less tissue trauma than open surgery, which means less of the inflammatory response that drives adhesion formation in the first place.