A knee arthroscopy with meniscectomy is a minimally-invasive surgical procedure where a surgeon removes or trims the medial (inner) and/or lateral (outer) meniscus - which is the thick, c-shaped pad of cartilage that helps absorb impacts in the knee. A meniscectomy is typically performed for a torn meniscus, a common knee injury. The goal of the surgery is to remove fragments of the meniscus that stick out into the joint.