Imaging Services
MRI of the Ankle and Hind Foot
Basics: What is an MR of the ankle and hind foot?
MRI of the ankle and hind foot is the gold standard for evaluation of tendons and bones in the ankle. Avascular necrosis is commonly seen after talus fractures. Additionally, MRI is extremely sensitive at detecting marrow edema secondary to occult fractures, osteomyelitis, regional migratory osteoporosis, reactions to altered biomechanics, and arthritic disorders. The most frequently diseased tendons in the ankle are the Achilles, posterior tibial, and peroneal. MRI can be used to diagnose most disorders of these tendons, as well as stage these disorders to allow appropriate therapy.
Magnetic Resonance Imaging is considered medically necessary for the evaluation of the ankle for the following indications:
- Suspected
- Avascular necrosis of talus after standard X-rays.
- Tendon rupture.
- Intra-articular loose body.
- Acute injury with ligamentous instability.
- Osteochondral injury of the talar dome.
- Morton’s neuroma, if there is diagnostic uncertainty or if it will affect the treatment plan.
Discussion of images above:
This patient was experiencing a decreased range of motion in the ankle, as well as pain and swelling. The above images show a small tear of the Achilles tendon along with some tendinosis.