To better understand tarsal tunnel syndrome, it helps to understand the anatomy of the ankle joint.

The ankle consists of three bones:

• The tibia is the large, long bone in the lower leg.
• The fibula is the thin, long bone in the lower leg.
• The talus lies on top of the heel bone and supports the tibia.

The posterior tibial nerve travels down the back of the leg and runs between medial malleolus and the tarsal bone: this area is called the tarsal tunnel.

Examples:

• Tibia and fibula
• Side view of ankle bones
• Front view of ankle bones on x-ray

These three bones are bonded together by strong bands, called ligaments. The ligaments, muscles and tendons keep the bones of the ankle together during movement.

Examples:

• Inner aspect of ankle joint
• View from behind the ankle joint
• Outer aspect of ankle joint