Hip osteoarthritis is a degenerative hip joint disease that commonly occurs in elderly people. However, hip osteoarthritis can also occur in the younger group of people as well because the joints may not have formed properly or there may be birth defects in the cartilage of some people,

Knee joint effusion or water in the knee is an abnormality of synovial fluid in the knee joints which could be a result of an inflammation or injury. For instance

Injuries like strains, sprains and injured joints are common in sports and athletic activities.