Microfracture surgery repairs damaged cartilage in an individual's knee. Doctors use microfracture surgery to help some patients avoid a partial or total knee replacement, according to C. Benjamin Ma of the University of Maryland Medical Center.

Patients of microfracture surgery use a continuous passive motion machine starting right after surgery and continuing for up to six weeks. Patients may also use a stationary bike, according to the Steadman Clinic's website.

Patients recovering from microfracture surgery must wait six to eight weeks before fully walking. Patients must use crutches to move around during this time.

Patients with a smaller area requiring repair may put weight on their leg "a few weeks sooner," according to the Steadman Clinic's website.