The human body's immune response to a surgically installed foreign object—breast implant, cardiac pacemaker, orthopedic prosthesis—is to encapsulate it with scar tissue capsules of tightly woven collagen fibers, in order to maintain the integrity of the body by isolating the foreign object, and so tolerate its presence. Capsular contracture—which should be distinguished from normal capsular tissue—occurs when the collagen-fiber capsule thickens and compresses the breast implant; it is a painful complication that might distort either the breast implant, or the breast, or both.
Generally, you can go back to working out two to three weeks after breast lift or breast reduction surgery. This depends on how you feel. Do not lift anything that weighs more than five pounds for three weeks. Avoid contact sports for six weeks. If you had breast enlargement with a breast lift, hereafter avoid all exercises which isolate your pectoralis muscles as these can shift the implant toward you armpit. Workouts must stop if you experience discomfort in your breasts or chest. A balance of rest and reduced activity will speed up your recovery.
In surgical practice, for the reconstruction of a breast, the tissue expander device is a temporary breast prosthesis used to form and establish an implant pocket for the future permanent breast implant. For the correction of male breast defects and deformities, the pectoral implant is the breast prosthesis used for the reconstruction and the aesthetic repair of a man's chest wall (see: gynecomastia and mastopexy).
2000 European Union European Committee on Quality Assurance & Medical Devices in Plastic Surgery (EQUAM) "Additional medical studies have not demonstrated any association between silicone-gel filled breast implants and traditional auto-immune or connective tissue diseases, cancer, nor any other malignant disease. . . . EQUAM continues to believe that there is no scientific evidence that silicone allergy, silicone intoxication, atypical disease or a 'new silicone disease' exists."
Since experienced surgeons are aware of these issues with saline breast implants and their need for eventual replacement, they opt to place them under the chest muscle. The chest muscle works as an extra layer of tissue over the implant, which makes for a smoother transition from the chest wall to the implant. The finished product is a more seamless transition versus a more visible and abrupt change when the implant is not placed below the pectoral muscle. As for gel breast implants, they can also be safely placed below the pretorial muscle if that is a viable option for the patient since replacement and wrinkling is less common with this type of implant.