Adult patients who had cochlear implant surgery before will be included. We will call patients from our cochlear implant list.

Postural stability measurements will be done by Biodex Balance System. Three preprogrammed main tests will be applied. Postural stability, fall index, sensory integration will be calculated. All tests will be done in four conditions; implant off(1), implant on(2), implant on music on(3), and implant off again(4).

Deviation of center of gravity(angle) test assesses a patient's ability to maintain a center of balance. It measures how much the patient's position deviates from center and reports the average deviation as the stability index. Therefore, a low score is more desirable than a high score. Postural stability is a calculated value of difference in center of gravity when the subjects tested eyes open/closed, hard and soft surface test conditions. Postural stability will be measured in four conditions: İmplant on, implant off, implant on+music on, implant of again

A high sway velocity when a patient is attempting to stand motionless suggests a deficit in postural control and assessment for lower extremity strength, proprioception, and vestibular or visual deficiencies. Postural sway velocity will be measured in four conditions: İmplant on, implant off, implant on+music on, implant of again

The Clinical Test of Sensory Interaction of Balance (CTSIB) is a standard test for balance assessment on a static surface. The test assesses how well a patient can integrate sensory information to maintain balance. The result of the CTSIB test is the patient's sway index, which represents the mean absolute deviation of the patient's average position during a test. The higher the sway index, the more unsteady the person was during the test. Sensory Integration Test will be measured in four conditions: İmplant on, implant off, implant on+music on, implant of again