Capsular contracture happens when the scar tissue or capsule that normally forms around the implant tightens and squeezes the implant. The chance of capsular contracture occurring may increase over time, though its causes are unknown. Symptoms of capsular contracture range from mild firmness and mild discomfort to severe pain, distorted shape of the implant and palpability (ability to feel the implant).
Capsular contracture is graded into four levels depending on its severity. Baker Grades III or IV are considered severe and often additional surgery is needed to correct these grades: