The operative procedure is known as "microfracture" is done for the

Ans. is 'd' i.e. Osteochondral defect of the femurRef. Various internet sites (www.orthopedics.hss.edu, www.kneeguru.co.uk)Microfracture is an arthroscopic procedure used to treat osteochondral defects (damaged areas of articular cartilage of the knee)