Dr. WANG Sun is a Chief Physician. He is a member of the Pediatric Orthopedics Group of the Pediatric Surgery Branch of the Chinese Medical Association, and serves as the Deputy Head of the Pediatric Orthopedics Working Group of the Orthopedics Branch of the Shanghai Medical Doctors Association. With over 30 years of clinical experience in pediatric orthopedics, he currently works in the Department of Orthopedics at Shanghai Children's Hospital (Children's Hospital of Shanghai Jiao Tong University School of Medicine). His expertise includes the treatment of various pediatric limb fractures and trauma, correction of congenital deformities (such as torticollis, clubfoot, polydactyly, syndactyly, hip dislocation, etc.), management of cerebral palsy, as well as treatment of bone tumors, tumor-like lesions, and extremity masses (including hemangiomas and lymphangiomas).