Animation deformity after breast reconstruction: causes and correction

Animation deformity occurs when a breast implant placed behind the pectoral muscle (the retropectoral or submuscular plane) moves unnaturally during muscle contraction. It can occur in patients with submuscular implants, particularly after breast reconstruction, where it occurs significantly more often than after cosmetic augmentation.

During activation of the pectoralis major, when lifting, pushing, or exercising, the implant flattens and shifts upward and outward (superolaterally). In many patients, this displacement also affects the overlying skin and nipple-areolar complex, which can be visually distressing. Animation deformity can also cause pain and chronic discomfort.

What causes it

Animation deformity has a single root cause: implant placement in the retropectoral plane (behind the muscle), with or without the use of an inferior mesh or dermal sling. As long as the implant remains beneath the pectoralis major, muscle contraction will continue to move it.

How we correct it

Because animation deformity is directly caused by implant position beneath the muscle, treatment focuses on moving the implant in front of the muscle (the prepectoral plane) or removing it entirely, along with repairing the pectoralis major back to its natural position on the chest wall. Achieving the best aesthetic and functional result often requires more than one procedure.

The right combination of techniques depends on the patient's anatomy, prior surgical history, and goals:

• Implant plane change. The implant is removed, the pectoralis major is repaired to the chest wall, and the implant is replaced in the prepectoral plane. Additional soft tissue support may be used depending on the patient's anatomy.
• Fat grafting. In thinner patients or those with thin mastectomy skin flaps, fat grafting can be performed prior to the plane change to improve the overall aesthetic result, camouflage implant borders, and reduce visible rippling.
• Biologic or synthetic support. Acellular dermal matrix (ADM) or specialized synthetic mesh (such as P4HB) can provide structural reinforcement, improve implant contour, and reduce the risk of implant visibility after plane change.
• Implant type upgrade. In some cases, switching to a cohesive gel ("sixth generation") implant can help address rippling and implant border visibility that are common with prepectoral reconstruction.
• Conversion to autologous reconstruction. For patients who prefer a permanent, implant-free solution, the implant can be removed and replaced with the patient's own natural tissue following pectoralis repair. For patients without sufficient donor tissue, a hybrid approach combining a small flap with an implant can improve coverage and reduce visibility.

Finding the right approach for you

Animation deformity can be subtle or severe, and the right correction depends on how it presents and what matters most to you. We carefully evaluate your anatomy, prior reconstruction history, and goals before recommending an approach.

If you have animation deformity that is affecting your comfort, your confidence, or your ability to move freely, a consultation can clarify what is achievable and what the right next step looks like in your specific case.