1. Department and Clinic of Orthopaedic and Traumatologic Surgery, Wroclaw Medical University, Borowska 213, Wroclaw 50-556, Poland
2. Department of Physiotherapy in Motor Disorders and Dysfunctions, University School of Physical Education in Wroclaw, Al. IJ Paderewskiego 35, Wroclaw 50-556, Poland
3. Department of Orthopedics and Musculoskeletal Traumatology, Medical University of Warsaw, Lindeya 4, Warszawa 02-005, Poland
4. Health Promotion, Faculty of Physiotherapy, University School of Physical Education, Wroclaw, Al. IJ Paderewskiego 35, Wroclaw 51-612, Poland
5. Department and Clinic of Neurosurgery, Wroclaw Medical University, Borowska 213, Wroclaw 50-556, Poland
6. Department and Clinic of Orthopaedic and Traumatologic Surgery, Wroclaw Medical University, Borowska 213, Wroclaw 50-556, Poland; Department of Orthopaedic and Traumatologic Surgery, Institute of Medical Sciences, University of Opole, al. Witosa 26, Opole, Wroclaw 45-401, Poland