Tarsal tunnel syndrome

In tarsal tunnel syndrome, the tibial nerve is compressed in a narrow canal behind the inner ankle. It is the counterpart of carpal tunnel syndrome in the hand.

Signs

• tingling, burning or numbness on the sole and toes
• complaints increase when standing and walking, often at night too
• tenderness when tapping behind the inner ankle

Causes

• foot deformities such as a flexible flatfoot
• ankle injuries
• swelling, e.g. due to varicose veins or ganglia

Differentiation

Similar complaints are caused by polyneuropathy, which usually affects both feet evenly. The diagnosis is made by a neurologist. Treatment involves rest, insoles and anti-inflammatory measures, rarely surgery. With reduced sensation, careful foot care is particularly important.