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Gaenslen's testA clinical test used to identify sacroiliac (SI) joint dysfunction.
The patient lies supine, close to the side of the examination table. The examiner allows the near leg to hang over the side of the table, and instructs the patient to actively flex the other leg to his or her chest and hold it; stabilising the patient, the examiner applies pressure to the near leg, forcing it into hyperextension.
Pain implies SI joint dysfunction.