Dr Jiying Chen is Director of the joint surgery in the Chinese PLA General Hospital, and the secretary general of the Orthopaedic Professional Committee. He is the head of the Arthrology Group, the member of the Orthopaedic Surgeons Branch of the Chinese Medical Association, the deputy head of the Hip Joint Working Group, the member of the Arthrology Group and the deputy head of the Basic Science Group of the Chinese Medical Association, the member of the Orthopaedic Branch of the Beijing Medical Association, the deputy head of the Arthrology Group and the Deputy head of the Infectious Science Group.