Capsular contracture is the most common complication of breast implants. It happens when the natural scar tissue your body forms around an implant tightens and squeezes the implant, making the breast feel firm, look distorted, or become painful. Every breast implant gets a thin capsule of scar tissue around it; that’s a normal immune response. Capsular contracture is what happens when that capsule thickens and contracts beyond what’s normal.
Why Your Body Forms a Capsule
Any time a foreign object is placed inside the body, the immune system responds. Within hours of implant surgery, immune cells rush to the site and begin forming a barrier of collagen fibers around the implant. This is the same basic wound-healing process that closes a cut on your skin. Specialized cells called fibroblasts lay down collagen, and the result is a thin, flexible envelope of scar tissue that surrounds the implant. In most cases, this capsule stays soft and thin, and you never notice it.
The problem starts when the immune system doesn’t settle down. If inflammation around the implant becomes chronic, fibroblasts transform into a more aggressive cell type with contractile properties, essentially acting like tiny muscles embedded in scar tissue. These cells keep producing collagen and actively tighten the capsule. The capsule thickens, stiffens, and eventually squeezes the implant inward. The result is a breast that feels progressively harder and can visibly change shape.
What Triggers It
Several factors can push normal capsule formation into contracture. One of the most studied is subclinical bacterial infection. The “biofilm theory,” first proposed by researcher Burkhardt, suggests that bacteria can colonize the surface of an implant at very low levels, not enough to cause an obvious infection but enough to trigger a persistent, low-grade immune response. This chronic irritation drives excessive scar tissue formation over months or years.
Other triggers include silicone particles leaking through the implant shell (known as gel bleed), autoimmune reactions, and radiation therapy. Radiation to the chest, common after breast cancer surgery, causes scarring of the chest muscle that significantly increases contracture rates. In some cases, no clear trigger is identified.
When It Typically Develops
If a surgical site infection is the cause, contracture can appear within weeks. More commonly, though, capsular contracture develops slowly. It most often shows up between one and two years after surgery, though studies have tracked onset anywhere from about 15 months to 8 years. This is part of what makes it frustrating: you can have a great result for a year or more before noticing changes.
How It Feels and How It’s Graded
Doctors use the Baker grading system to classify capsular contracture into four stages based on how the breast looks, feels, and whether it hurts:
- Grade I: The breast feels naturally soft and looks normal. This is a healthy capsule.
- Grade II: The breast feels slightly firmer than normal but still looks fine. Many people at this stage don’t realize anything has changed.
- Grade III: The breast is noticeably firm and looks visibly distorted. The implant may appear to sit higher, look rounder than intended, or have an unnatural shape.
- Grade IV: The breast is hard, visibly distorted, and painful. The implant may be displaced, and the tightness can cause constant discomfort.
Grades I and II generally don’t require treatment. Grades III and IV are where intervention becomes necessary, either because of pain, appearance, or both.
How Common It Is
Published rates vary widely, from under 3% to as high as 70% depending on the study, the type of implant, and how long patients were followed. The range is so broad because older implant designs had much higher rates, and studies define and track contracture differently. With modern implants and surgical techniques, the rates are at the lower end of that range, but capsular contracture remains the single most frequent reason people need additional surgery on their implants.
Risk Factors You Can Influence
Implant Placement
Where the implant sits in the chest makes a meaningful difference. Implants placed behind the pectoral muscle (submuscular) have roughly half the contracture risk compared to implants placed in front of the muscle, directly behind the breast tissue (subglandular). A meta-analysis found that subglandular placement carried more than a twofold increased risk of contracture.
Implant Surface Texture
Textured implants were originally designed to reduce contracture, and in some positions they do. When placed in front of the muscle (subfascial plane), smooth implants had a four-fold higher contracture risk than textured ones. However, when both types were placed behind the muscle, their contracture rates were similar. Worth noting: textured implants have been linked to a rare type of lymphoma called BIA-ALCL, which has influenced many surgeons and patients to choose smooth implants combined with submuscular placement instead.
Non-Surgical Treatment
For early-stage contracture (Grade II or early Grade III), medications that block inflammation have shown some promise. These are drugs originally designed for asthma that work by blocking leukotrienes, chemical signals involved in inflammation and tissue contraction. In a study of over 1,100 breast augmentation patients, those who took one of these medications for three months after surgery had a contracture rate of about 2.2%, compared to 5% in patients who took nothing. Some patients who had already developed Grade III or IV contracture improved to Grade II after an additional three months of medication. The effect was modest and not always statistically significant depending on the specific drug used, but it represents one of the few non-surgical options available.
Surgical Options
When contracture reaches Grade III or IV, surgery is typically the path forward. Two main approaches exist.
Open Capsulotomy
The surgeon makes cuts through the thickened capsule to release the pressure, but leaves the capsule tissue in place. This is a shorter procedure, usually 20 to 30 minutes per side, with less pain and a recovery measured in days rather than weeks. Because the surgery involves less tissue disruption, it theoretically generates less new inflammation. The tradeoff is a perception of higher recurrence, though recent data challenges that: one study found a 22.7% recurrence rate after capsulotomy, which actually compared favorably to the 25% to 53% recurrence rates reported after the more aggressive approach.
Capsulectomy
This involves removing the entire capsule along with the implant. It’s considered the “gold standard,” especially when combined with placing a new implant in a different position (such as switching from above the muscle to below it). The surgery is more extensive, adding about an hour of operating time, and carries higher risks including more bleeding, potential nerve injury, and in rare cases puncturing the lung if capsule tissue is tightly adhered to the chest wall. A drain may be needed afterward. This approach is particularly recommended for thick, calcified capsules that won’t respond well to simple release.
In both cases, recurrence is a real possibility. Capsular contracture has a frustrating tendency to come back regardless of which surgical method is used, which is why surgeons often combine the procedure with other changes: switching to a different implant type, changing the implant pocket location, or using medication afterward to reduce the chance of the cycle repeating.
Reducing the Risk During Initial Surgery
Many of the strategies surgeons use to prevent capsular contracture focus on minimizing bacterial contamination during the original procedure. These include irrigating the implant pocket with antibiotic solutions, using a “no-touch” technique where the implant is handled as little as possible, making incisions away from the nipple (since breast ducts harbor bacteria), and placing the implant behind the muscle. No combination of precautions eliminates the risk entirely, but together these measures have brought contracture rates down significantly compared to earlier decades of implant surgery.