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Coronary artery narrowing, also known as coronary artery disease, occurs when the blood vessels that supply the heart with oxygen (the coronary arteries) gradually become narrower. This usually happens due to a build-up of fatty deposits, cholesterol and other substances in the artery wall.

The hip joint forms the connection between the pelvis and upper leg and consists of the head of the femur and the hip socket (acetabulum). The hip is a ball and socket joint and allows the upper leg to move in all directions.

In an ingrown toenail, the skin around the nail is irritated or damaged by one or both corners of the nail growing into the skin. This can lead to inflammation and sometimes infection. Usually the problem occurs on the big toe.

Cartilage defects (osteochondral lesions) of one or more bone parts of the joint can occur due to wear and tear and/or a (sports) injury. It can also occur spontaneously without any apparent cause.

Knee injuries are a common problem that can affect people of all ages. The knee is a complex joint crucial for movement and stability, making it susceptible to many injuries.

A joint mouse is a loose piece of bone or cartilage. It can occur due to a cartilage defect, but is also often caused by a bone fracture or serious accident to the joint, which causes a loose piece of bone to enter the joint.