Ismail Turkmen1, Burak Ozturan2, Tuncay Kaner3, Korhan Ozkan2. 1. Department of Orthopaedics and Traumatology, Beykoz State Hospital, Istanbul, Turkey. 2. Department of Orthopaedics and Traumatology, İstanbul Medeniyet University, Istanbul, Turkey. 3. Department of Neurosurgery, İstanbul Medeniyet University, Istanbul, Turkey.