Patient Information Resources

Centre for Orthopaedics
Suite 10-33/34/35 Mount Elizabeth Novena Specialist Centre
38 Irrawaddy Road
Singapore, 329563, Singapore
Ph: (65) 6684 5828
Fax: (65) 6684 5829

Child Orthopedics
Pain Management
Spine - Cervical
Spine - General
Spine - Lumbar
Spine - Thoracic

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My ankle keeps going out from underneath me when I'm walking. I had an X-ray and everything was normal. The doctor says I have "functional ankle instability." What does that mean?

Functional ankle instability is a condition that occurs most often after an ankle sprain. Like you, the patient describes a sense that the ankle is going to give out from underneath him or her. Often that's exactly what does happen.

X-rays and ligament testing are normal. That means there are no fractures and the ligaments aren't loose or "lax."

A recent study of electrical activity of the peroneus longus muscle in the lower leg and ankle may offer some clues. It seems the muscle is slow in responding to changes in the foot position after an ankle sprain. This decreased activity may be part of what's causing the ankle instability.


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