The Baker grades
Surgeons classify capsular contracture on a four-point scale that has been in clinical use since the 1970s. It is a judgement made by hand and eye, which is both its usefulness and its weakness.
The four grades
The Baker classification grades capsular contracture from I to IV. Grades III and IV are considered clinically significant, and are generally the threshold at which reoperation is discussed.
| Grade | What it means | What usually follows |
|---|---|---|
| Baker I | Soft and natural The breast is soft and looks the way it would without an implant. No symptoms. Most implants stay here. | No treatment. This is the normal state. |
| Baker II | Slightly firm, looks normal You can feel that the breast is firmer than it was, but nobody looking at it would see a difference in shape. | Usually monitored rather than operated on. |
| Baker III | Firm, and visibly changed The breast is firm and the shape has altered — rounder, sitting higher, or more obviously an implant than it was. | Generally considered clinically significant. Surgery is usually discussed. |
| Baker IV | Hard, distorted and painful The breast is hard and misshapen, and it hurts — at rest, not only when pressed or during activity. | Clinically significant. Surgery is usually recommended. |
Why the grade matters
The grade is not a description for its own sake. It is what determines whether an intervention is offered, and it is frequently what an insurer wants documented before funding removal or revision. If you are pursuing coverage, the assessment being recorded as Baker III or IV rather than “some firmness” is the practical difference.
It also matters for the reverse reason. Grade I and II contracture is common and often stable for years. Being told you have mild contracture is not, by itself, a reason to book surgery.
What the scale does not capture
Baker grading is a clinical judgement made by palpation and inspection. Two surgeons can grade the same breast differently, and there is no blood test or definitive measurement behind it.
Researchers have proposed more objective measures — ultrasound assessment of capsule thickness, and imaging-based measurement of implant shape change — and studies have found capsule thickness increases across the Baker grades. A consensus approach to grading severity more objectively has been the subject of systematic review, but none of these methods has replaced clinical grading in routine practice.
Two practical consequences. First, a second opinion is reasonable if a grade is being used to decline you surgery or coverage. Second, your own account of change over time is genuinely useful evidence, because the surgeon is seeing a single moment and you have seen the whole trajectory.
Grading yourself
You can reasonably tell whether your breast is softer or firmer than it was, and whether the shape has changed. You cannot reliably distinguish grade II from grade III, and attempting it mostly produces anxiety.
What is worth doing is recording the trajectory: when you first noticed a change, whether it is one side or both, whether it is progressing, and whether there is pain. That record is more useful at an appointment than a self-assigned grade. Our symptoms page sets out what to watch for, and the treatment page covers what happens once a grade is assigned.
- Baker JL. Classification of capsular contracture in augmented breasts. Four-grade scale in clinical use since 1975.
- Toward a consensus approach for assessing capsular contracture severity and progression: a systematic review. Plastic and Reconstructive Surgery.
- Ultrasound criteria and Baker scale for breast implant capsular contracture diagnosis.