In-depth

Twisting the knee can cause a common knee injury known as a torn meniscus. Treatment sometimes includes surgery.

Arthroscopy

Got a painful joint? With arthroscopy, you can find out why — and get relief.

Avascular necrosis

Loss of blood flow to a bone leads to avascular necrosis — the death of bone tissue. This most commonly affects the thighbone, causing groin pain.

Baker's cyst

A Baker's cyst is a swollen area behind your knee. Treating the primary cause — such as arthritis or a cartilage tear — usually helps relieve pain.

Bone spurs

Bone spurs can sometimes interfere with joint function or press on nerves.

CT scan

A CT scan is an imaging test that uses X-rays to produce detailed images of the inside of your body.

Hemophilia

Hemophilia occurs when your body lacks one of several clot-forming proteins called clotting factors. The result is prolonged bleeding, which can be life-threatening.

Knee braces

A knee brace may reduce osteoarthritis pain in your knee by shifting the force of your weight off the damaged part of your knee when you walk.

Knee bursitis

Knee bursitis, inflammation of small fluid-filled sacs in the knee joint, causes pain and limits mobility.

Knee replacement

Find out what to expect before, during and after knee replacement surgery.

Lyme disease

Lyme disease is a tick-borne illness. Left untreated, it can lead to serious and lingering complications — including arthritis.

MRI

MRI uses a magnetic field and radio waves to create detailed images of the organs and tissues within your body.

Osgood-Schlatter disease

Osgood-Schlatter disease can cause pain, swelling and tenderness below the kneecap. This common condition often affects young athletes involved in running, jumping and bending activities.

Patellar tendinitis

Don't let the common term "jumper's knee" fool you. Patellar tendinitis can affect anyone — no matter how frequently or infrequently you jump.

Polymyalgia rheumatica

Polymyalgia rheumatica is an inflammatory disorder that causes pain and stiffness in the neck, shoulders, upper arms, hips and thighs.

Posterior cruciate ligament injury

Less common than an ACL knee injury, a torn posterior cruciate ligament can be painful and sideline you for months. Find out more.

Ultrasound

Ultrasound imaging uses high-frequency sound waves to create images of structures in your body.

X-ray

X-rays are a form of radiation that can make images of your bones and internal organs.

Jul. 12, 2013