1. Movement Analysis Laboratory, IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10, Bologna 40136, Italy
2. Department of Mechanical Engineering/Centre for Therapeutic Innovation, Claverton Down Bath, BA2 7AY, United Kingdom
3. II Clinical Department, IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10 Bologna 40136, Italy
4. II Clinical Department IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10 Bologna 40136, Italy