The knee contains two pads of cartilage (menisci) that act as shock absorbers between the femur (thigh bone) and tibia (shinbone). Tearing of the cartilage (a meniscus tear) usually occurs as a result of a sudden twisting of the leg; it is a common sports injury.
Symptoms typically include sudden pain in the knee, swelling of the knee, and difficulty straightening the leg.
A mild tear may be treated with rest and nonsteroidal anti-inflammatory drugs.
A severe tear may require surgery to repair or remove the damaged cartilage.

Othere related diseases

Osteoid osteoma
Noncancerous bone tumors may affect any bone, but are most common in the long bones of the limbs or the vertebrae, or the bones of the hands. The main types are...

OSTEOMYELITIS
Osteomyelitis is infection of a bone, usually due to injury, surgery, or the spread of infection from elsewhere in the body. Often, the infection is with Staphy...

OSTEOPOROSIS
In osteoporosis, there is loss of bone tissue, making the bones thinner and weaker. It is a natural part of aging, but women are especially vulnerable after men...

PAGET'S DISEASE OF BONE
Also called osteitis deformans, Paget’s disease is the disruption of the process of bone renewal, leading to weakened and sometimes distorted bones.
Norm...

PATELLOFEMORAL PAIN
Patellofemoral pain syndrome is the medical term for pain around the front of the knee that is not associated with any signs of damage or problems in the knee. ...

PIRIFORMIS SYNDROME
The piriformis muscle is a located in the buttocks, near the top of the hip joint. In piriformis syndrome, the muscle spasms and presses on the sciatic nerve, w...

PLANTAR FASCIITIS
The plantar fascia is a band of tissue that runs under the sole of the foot from the heel bone to the base of the toes. Inflammation of this tissue—plantar fa...

PLICA SYNDROME
The plica is a fold of membrane in the knee that is thought to be tissue that normally disappears during fetal development but persists after birth in some peop...