Inclusion criteria:
A history of at least 1 ankle sprain at least 12 months prior to the study enrollment, should be associated with inflammatory symptoms (pain, swelling, etc) and created at least 1 interrupted day of desired physical activity. The most recent injury must have occurred more than 3 months prior to study enrollment.
A history of the previously injured ankle joint giving way(participants should report at least 2 episodes of giving way in the 6 months prior to study) and/or recurrent sprain( two or more sprains to the same ankle)and/or feelings of instability.
Receiving a score less than 24 on Cumberland Ankle Instability Tool (CAIT)
Receiving a score less than 90% for daily activity (ADL scale) and less than 80% for sport on Foot and Ankle Ability Measure (FAAM).
Unilateral chronic ankle instability
Being at the age of 18_55 years
Exclusion criteria:
A history of any previous surgery on musculoskeletal structures (ie, bones, joint structures, nerves) of the lower extremities
A history of any fracture in lower extremities
Acute injury to musculoskeletal structures of other joints of the lower extremities in the previous 3 months
Potential contraindication of Whole Body Vibration usage
Some disease due to balance problem (peripheral neuropathy, MS, Parkinson, Migraine, Radiculopathy, middle ear disease)