The number of fat cells in an adult stays constant. After puberty weight losses and gains depend on how much the fat cells expand in size and nutrition. Liposuction permanently removes fat cells. As the number of fat cells is constant, the surgery has permanent results. But the changes in body contour are still possible.
Liposuction surgery results depend among other factors on your general health, weight and hormone balance. Weight gain, especially caused by nutrition, can lead to expanding fat cells even in the treated area. Temporary wavy irregularities or lumps, which usually disappear in one year, can also occur. On rare occasions corrective surgery is called for.
Like every aesthetic surgery you may need corrective surgery if the results of the first surgery are not as expected or because of impaired wound healing, infection, bleeding or aesthetically unsatisfying results.