Animation Deformity: Why Breast Implants Move When You Flex
By Partington Plastic Surgery on October 12, 2026 in Breast Augmentation, On Top
If your breasts jump, flatten, or pull toward your armpits every time you push open a door, lift a grocery bag, or do a push-up, you are not imagining it. This movement has a name: animation deformity. It is one of the most common and most frustrating side effects of placing implants beneath the chest muscle.
This article explains what is animation deformity, why it happens, how to recognize it, how to prevent it when planning surgery, and how it can be corrected if you already have it.
What Is Animation Deformity?
Breast animation deformity is a visible distortion of the breast that occurs when the pectoralis major muscle contracts. The pectoral muscle is a large, powerful muscle that spans the upper chest. When implants are placed underneath it, every contraction squeezes and pushes the implant.
As a result, the breast can change shape in ways that look unnatural during everyday movement. The implant may ride upward, flatten across the top, shift toward the side, or create a visible groove or dimple in the skin. When the muscle relaxes, the breast returns to its resting shape, which is why many patients only notice the problem during activity.
This kind of distortion is not dangerous to your health. However, for many women it affects confidence, wardrobe choices, and comfort during exercise, which is why so many seek correction.
Why Does Animation Deformity Happen?
The cause of animation deformity breast surgeons see is mechanical. Any time an implant sits partly or fully under the pectoral muscle, that muscle can move it. The more muscle covering the implant, the more movement tends to occur.
A systematic review of breast animation deformity published in Archives of Plastic Surgery found that the median rate of some degree of this distortion after submuscular augmentation was 58% across the studies reviewed, and one study reported a rate of 78% after dual-plane placement. The authors concluded that the degree of distortion appears proportional to how much muscle is involved.
Several factors can make breast implant animation deformity more noticeable:
- Very muscular or athletic patients generate stronger contractions that move the implant more.
- Thin patients with little natural breast tissue have less coverage to soften the distortion.
- Larger implants under the muscle can amplify visible shifting.
- Strength training that targets the chest increases how often and how forcefully the distortion appears.
Signs of Animation Deformity Breast Implants Can Cause
Animation deformity breast implants produce is usually easy to spot once you know what to look for. Common signs include:
- The breasts move upward or outward when you press your palms together.
- The upper part of the breast flattens during chest exercises.
- A dimple, groove, or ripple appears in the skin when the muscle flexes.
- Cleavage widens noticeably during arm movement.
- The breasts look uneven during activity even when they match at rest.
What Animation Deformity Pictures Show
Many patients first realize they have the problem after looking at animation deformity pictures online and recognizing their own experience. These photos typically show a relaxed breast next to the same breast during a pectoral flex, with clear upward displacement or a distorted contour. A simple at-home test is to stand in front of a mirror and press your hands firmly together at chest level. If your breasts change shape significantly, a consultation can confirm the diagnosis.
How to Avoid Animation Deformity
The most effective way to prevent the problem is to plan implant placement carefully from the start. Knowing how to avoid animation deformity begins with understanding implant pockets.
With traditional submuscular placement, the muscle is lifted and the implant is tucked beneath it. With placement above the muscle, the implant sits where natural breast tissue already lives, and the pectoral muscle stays attached in its normal position. Because the muscle no longer acts on the implant, the risk of breast augmentation animation deformity is essentially removed.
This is the foundation of Dr. Partington’s On Top® Rapid Recovery Breast Augmentation. By leaving the muscle undisturbed, the technique avoids muscle-related distortion, reduces post-operative pain, and allows patients to go out for lunch the day after surgery. Our practice pairs this approach exclusively with Motiva® silicone implants, whose soft, flexible design is engineered to move naturally with the body.
For a deeper comparison of placement options, read our guide to subglandular vs submuscular breast implants.
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Treatment Options for Implant Animation Deformity
If your implants already distort when you flex, there are several ways surgeons address it. The right choice depends on how severe the distortion is and how much it affects your daily life.
Non-Surgical Options
Neuromodulator injections into the pectoral muscle can temporarily weaken its contraction and reduce visible movement. The effect wears off over several months, so treatments must be repeated. This can be a useful way to preview how much improvement correction might bring, but it is not a permanent solution.
Surgical Correction With a Pocket Change
The most lasting fix for animation deformity implants cause is moving them out from under the muscle. Dr. Partington’s On Top® Pocket Change procedure relocates the implants from beneath the chest muscle to a new pocket above it. The old pocket under the muscle is closed, and the pectoral muscle is returned to its natural position on the ribs.
Because the muscle no longer acts on the implants, the breasts can look, feel, and move more naturally. Patients often find that recovery from a pocket change is more comfortable than recovery from their original submuscular augmentation. Light daily activities typically resume within 24 hours to one week, and strenuous upper-body workouts are postponed for four to six weeks.
A pocket change can also be an opportunity to address other concerns at the same time, such as switching implant size, replacing older implants with Motiva® implants, or correcting implant malposition.
BREAST AUGMENTATION GALLERY
VIEW GALLERYIs Correcting Implant Distortion Worth It?
Not every patient with mild distortion needs surgery. If the movement is subtle and rarely bothers you, monitoring it is a reasonable choice. However, you may want to consider correction if:
- You avoid workouts, yoga, or certain clothing because of how your breasts move.
- The distortion is visible during ordinary tasks like carrying bags or driving.
- You also experience chest tightness, discomfort, or firmness from the implants.
- You are planning an implant exchange anyway and want to fix the pocket at the same time.
You can also learn more about common issues with submuscular placement in our article on problems with under-the-muscle breast implants.
Frequently Asked Questions
What is animation deformity?
It is a visible distortion of the breast that occurs when the chest muscle contracts over an implant placed beneath it. The breast may move upward, flatten, or dimple during activity.
Does this distortion happen with implants above the muscle?
Because the pectoral muscle does not cover an implant placed above it, muscle-driven distortion is essentially avoided. This is one of the main benefits of above-the-muscle placement.
Is breast distortion during flexing harmful?
It is not a medical danger. It is a cosmetic and functional concern that can affect comfort, confidence, and exercise.
Can an animation deformity breast implant problem go away on its own?
It generally does not resolve with time, because it is caused by the muscle acting on the implant. Correction requires changing that relationship.
Can I keep my current implants during a pocket change?
In some cases existing implants can be reused, but many patients choose to replace older implants during the same surgery. Your surgeon will recommend the best option after an exam.
How long is recovery after a pocket change?
Most patients return to light daily activities within a day to a week. Strenuous upper-body exercise is typically postponed for four to six weeks.
Ready to Stop Your Implants From Moving?
If your breasts shift or distort every time you flex, you do not have to accept it as permanent. Dr. Partington has spent decades refining above-the-muscle techniques and can help you decide whether a pocket change is right for you.
Schedule your consultation with Partington Plastic Surgery →
Learn more about the On Top® Pocket Change procedure or visit the Partington Plastic Surgery Center homepage to explore the practice.