1. Department of Ankle and Foot Surgery, ICCS Istituto Clinico Città Studi, 20131 Milan, Italy
2. Department of Ankle and Foot Surgery, IRCCS Istituto Ortopedico Galeazzi, 20145 Milan, Italy
3. Orthopaedic Institute, ASST Pini/CTO, University of Milan, 20122 Milan, Italy