Dr. Malchau is a visiting professor of orthopedic surgery, joint arthroplasty, as well as a staff surgeon at Massachusetts General Hospital. He is one of the founders of the Swedish Hip Registry in Göteborg, Sweden, and is the former director of orthopaedics at Sahlgrenka Hospital in Göteborg, Sweden. Dr. Malchau has been an attending surgeon at the Mass General Department of Orthopaedics and was co-director of the Harris Orthopaedics Lab for twelve years. His clinical and research interest is focused on documentation of primary and revision hip replacements. Dr. Malchau has been an active clinician for years, and during the past 21 years he has performed numerous primary and revision hip arthroplasties. He has focused on hip arthroplasty in his postgraduate teaching activities and traveled internationally to share these observations with the orthopedic community. He has tutored several PhD students with the intention of continuing these extremely important educational activities.