How are MRIs used to diagnose hip and knee problems?

Scott D. Martin, MD
Orthopedic Surgery

Magnetic resonance imaging uses a strong magnet and radio waves to evaluate cartilage, soft tissues, and bone marrow. MRI is more expensive than computed tomography (CT) or standard x-rays, but it's the most accurate way to detect ligament damage, cartilage damage from arthritis, or tears in the cartilage or meniscus. A technique in which gadolinium (a metal dye) is injected into the hip joint before an MRI is highly accurate in detecting labral problems, such as labral tears. MRI is also used to evaluate a possible pelvic fracture, tumor, or lesions around the pelvis and hip.

During the exam, which lasts about 45 minutes, you lie on a scanning table that slowly moves you through the machine. (Many centers have smaller MRI machines that can focus on specific body parts, so if you're having your knee done you may only need to insert your knee.) For a hip exam, your feet may be taped together to keep your hips in the desired position. For a knee exam, a wedge may keep your knees at the desired angle. In some cases, the radiologist may inject a dye to obtain better images. You cannot have an MRI if you have a pacemaker, aneurysm clips, or certain other metal implants.

Continue Learning about Magnetic Resonance Imaging (MRI)

What do I need to know about MRI scans for my baby in the NICU?
Intermountain Registered DietitiansIntermountain Registered Dietitians
MRI (magnetic resonance imaging) uses a large magnet, radio frequencies, and a computer to create hi...
More Answers
What are the benefits of real-time MRI-guided radiation to treat cancer?
Percy Lee, MDPercy Lee, MD
Real-time magnetic resonance imaging (MRI)-guided radiation is especially useful for mobile tumors, ...
More Answers
Is it safe to have an MRI if I have a pacemaker?
UCLA HealthUCLA Health
It may be safe to have an MRI (magnetic resonance imaging) if you have a pacemaker, but safety guide...
More Answers
What to Expect From an MRI
What to Expect From an MRI

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.