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In 1990 he came back to Pakistan and joined Aga Khan University Hospital (Karachi) as a full time academic faculty member. Here he pioneered the development of arthroscopic surgery and joint replacement work. He is the founding faculty member of orthopaedic residency training program at the Aga Khan University and its director from 1995-2000. he is also a founding member of Pakistan Society for surgery of the hand and has served as its general secretary and president from 1995 – 1998. He also had the honor to serve as secretary general and president of Pakistan Orthopaedic Association from 1996 – 1999. Prof. Muhammad Umar M.D. is the founder and surgeon-in-chief of Institute of Orthopaedics and Surgery and head of orthopaedic service of South City Hospital. He is recognized for his expertise in total joint replacement and revision surgery.