Minimally invasive arthroscopic procedure to remove articular cartilage in the knee. Articular cartilage is a firm rubbery tissue that covers the ends of bones. It provides a smooth gliding surface for joints and acts as a cushion between bones. Cartilage can break down due to overuse or injury.
While normal atmosphere contains between 20.8 and 21 percent oxygen, OSHA defines as oxygen deficient any atmosphere that contains less than 19.5 percent oxygen, and as oxygen enriched, any atmosphere that contains more than 22 percent.
It differs from hypoxemia, which means an inadequate amount of oxygen traveling in the blood. Hypoxia may be due to hypoxemia, for example, if an inadequate amount of oxygen reaches the tissues because there is an inadequate amount of oxygen in the blood, or it may be due to other causes. If a complete lack of oxygen occurs in the tissues, it is termed anoxia.