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中修复重建外科专业委员会骨肿瘤专业学组，副组长。

刘忠军，北京大学第三医院大外科主任、脊柱外科研究所所长，骨科教授，博士生导师，主任医师 主要学术及社会兼职：AO国际脊柱外科学会中国理事会前任主委；北京大学医学部学术委员会委员；中国康复医学会脊柱脊髓专业委员会名誉主委；中国医师协会骨科分会副会长兼3D打印专业委员会主委；中国3D打印产业技术联盟医学理事会执行副主席；中华医学会骨科分会常委；中国脊柱脊髓杂志副主编；中国微创外科杂志副主编；中央保健委员会会诊专家；第十一届、十二届、十三届全国人大代表。

蔡宏，北京大学第三医院骨科主任医师，副教授，医学博士。主要从事人工关节置换，先后在韩国、加拿大、美国等多国学习。致力于人工关节假体及相关产品研发，系统性开展3D打印在骨科领域的基础与临床研究。主导参与研发的3D打印植入物成为国内首个获得CFDA注册许可的产品。发表学术论文二十余篇，其中SCI论文十余篇，获北京市科学技术奖一等奖、中国医院协会医院科技创新奖一等奖各一项，主持国家重点研发计划项目一项。 Hong Cai, chief physician and associate professor of Orthopaedics Department of Peking University Third Hospital. Dr. Cai received his M.D in the Specialty of Surgery (Orthopaedics) from Peking University Health Science Center. He studied in Seoul National University of Korea, University of Western Ontario of Canada and Medical Center of Rush University of Chicago as clinical fellow. He mainly engages in artificial joint replacement, devotes himself to the research and development of prosthetic at present , and systematically carries out 3D printing in medical field, especially the studies on the foundation and clinical application in Orthopaedics. He takes part in the research and development of several types of prosthetic replacement and research on clinical registration and has published many papers and books related to Orthopaedics. He is Chairman of Wu Jieping Medical Foundation Union of Young Orthopedists, an Executive Director of Arthroplasty Society in Asia, a commit member of Youth Committee of Chinese Association of Orthopaedics Surgeon, a member of National Technical Committee on Additive Manufacturing of Standardization Administration of China (SAC/TC562) and associate editor of Annals of Joint.