When the body receives an implant — even a biocompatible medical implant — it forms a layer of fibrous tissue around it to isolate the foreign material. This is a normal biological response. The problem arises when this capsule thickens and contracts strongly, causing distortion and pain. That is capsular contracture.
It is the most common long-term complication of breast augmentation — more important than implant rupture in many statistics. Understanding capsular contracture helps patients decide with information before and after surgery.
Mechanism: why the capsule forms and contracts
After implant placement, fibroblasts migrate to the peri-implant space and lay down collagen, forming a capsule within 4–6 weeks. Normally this capsule is thin and supple. In some cases the following factors lead to capsule thickening and contraction:
- Subclinical infection by low-virulence bacteria — one of the leading current hypotheses.
- Post-operative haematoma or seroma — providing a substrate for thicker fibrous response.
- Implant shell surface — different surfaces show different contracture rates in some studies.
- Implant position — subglandular has a higher contracture rate than submuscular in some studies.
- Individual factors — genetics and immune response may play a role that is not fully understood.
Baker grading: severity of contracture
The literature uses the Baker scale:
- Baker I: soft breast, normal shape — not a complication.
- Baker II: slightly firm on palpation, normal shape — no intervention needed.
- Baker III: firm, shape starts to distort (the breast looks too high and round) — usually an indication for treatment.
- Baker IV: firm, visibly distorted, painful — indication for revision surgery.
Baker III and IV are typically the threshold for intervention. Baker I and II are followed without intervention.
Signs patients can recognise
Capsular contracture usually progresses slowly over months to years. Signs to watch for:
- The breast becomes firmer over time — particularly obvious when lying down.
- The breast looks higher and rounder than before — as though "pushed up".
- A squeezed sensation, dull ache — sometimes sharp pain when sleeping on the side.
- A clearly asymmetric change between the two sides.
- A sense that the implant has "moved" upward or sideways.
If these signs appear — particularly more than a year after surgery, once the tissue has settled — schedule an early review rather than waiting for the next routine appointment.
Factors that reduce risk
Surgeons use several evidence-based measures to reduce capsular contracture risk:
- Strict intra- and post-operative aseptic technique to reduce shell contamination.
- Minimising hand contact with the implant — the "no-touch" technique.
- Pocket irrigation with antimicrobial solution per protocol.
- A Keller funnel for implant introduction — reducing skin contact.
- Selective use of drainage and meticulous haemostasis to reduce haematoma and seroma.
- Prophylactic antibiotics per protocol.
Management once contracture is established
Surveillance (Baker I-II)
If contracture is mild, asymptomatic, and not distorting, surveillance is usually the choice — sometimes mild contracture stabilises rather than progressing.
Capsulectomy
Surgical removal of the capsule with typical implant exchange. This is the standard for Baker III-IV. During the operation the surgeon may change implant position, change implant type, or place acellular dermal matrix to reduce recurrence.
Capsulotomy
Opening the capsule rather than removing it. Less invasive but higher recurrence rate. Less commonly used in modern practice.
Complete explantation
For patients with recurrent contracture or who choose not to re-implant, complete implant removal — leaving the breast without an implant — is an option. The breast will be smaller and sometimes mastopexy is needed in parallel to reshape it.
Recurrent contracture is a reality. A patient who has had contracture once is at higher risk than the population. This is an honest piece of information a responsible surgeon shares before the first intervention.
Frequently asked questions
What is the contracture rate?
The literature reports a wide range — roughly 5–20% over 10 years, depending on the study, implant type, position, and other factors. The rate is not fixed and is falling with newer techniques and products. A surgeon can share their own observed rate — if you ask.
How long after surgery can contracture appear?
It can appear early (in the first few months, often related to infection or haematoma) or late (years later). The rate accumulates over time — there is no "safe window" after which the risk falls to zero.
My breast feels slightly firm — is that capsular contracture?
Not necessarily. In the first 3–6 months the breast is still healing and may feel firm because of swelling and capsule formation — that is normal. Persistent firmness beyond six months, particularly with a shape change, may signal contracture and deserves evaluation.
After capsulectomy and re-implantation, what is the recurrence rate?
Higher than after the primary operation — some studies report 20–40% recurrence within five years after a first capsulectomy. This is part of why some patients and surgeons consider complete explantation after a second or third recurrence rather than continuing to exchange.
Is there a medication to prevent capsular contracture?
Some agents have been studied (leukotriene antagonists such as zafirlukast and montelukast) with mixed results. No medication is widely accepted as a "contracture-prevention drug" in international guidelines. If prescribed off-label, ask about the evidence and the risks.