Osteochondrosis is a condition that affects the growth of bones in children and adolescents. It occurs when the blood supply to a specific area of bone is disrupted, leading to the death of bone tissue. This can result in pain, swelling, and limited movement in the affected joint. Common sites for osteochondrosis include the knee, ankle, and hip. The exact cause of osteochondrosis is not fully understood, but it is believed to be related to repetitive stress on the bones and joints during growth spurts. Treatment often involves rest, physical therapy, and in some cases, surgery to relieve symptoms and restore function.