Alejandro Lizaur-Utrilla1, Fernando A Lopez-Prats2. 1. Department of Traumatology and Orthopaedics, Faculty of Medicine, Miguel Hernandez University, San Juan de Alicante, Alicante 03202, Spain. Electronic address: lizaur1@telefonica.net. 2. Department of Traumatology and Orthopaedics, Faculty of Medicine, Miguel Hernandez University, San Juan de Alicante, Alicante 03202, Spain.