Prof. Dr. Pietro Simone Randelli is a Full Professor at the University of Milan and is the Scientific Director of Gaetano Pini Orthopaedic Institute of Milan, Italy. He is chief of the 1st Department of Orthopaedics, Gaetano Pini - CTO Orthopaedic Institute, Milan, Italy. He is chairman of the residency program at the University of Milan, Italy. He serves as Vice-President of the Italian Society of Orthopaedics and Traumatology (SIOT). Surgical Experience with more than 7.000 procedures including mostly Shoulder and Knee Arthroscopy, Total Knee, Hip, and Shoulder replacement. Over 365 publications and participates in several editorial boards. Presented in 600 local and international meetings. Recipient of eight scientific Awards, National and International. He served on the board of ESSKA and SIGASCOT Scientific Society. He is an honorary Member of AOSSM (American Orthopaedic Society of Sports.