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Donald B Longjohn, MD
Assistant Professor of Clinical Orthopaedic Surgery
Orthopaedic Surgery
HCT 1520 San Pablo Street Health Sciences Campus Los Angeles
+1 323 442 5860


Dr. Longjohn is an assistant professor in the Department of Orthopaedic Surgery at the Keck School of Medicine of USC. He specializes in hip and knee replacement/revision surgery, as well as arthritis, rheumatoid arthritis, osteoarthritis and arthroscopic surgery. In addition to his membership in professional organizations such as American Association of Hip and Knee Surgeons and the Western Orthopaedic Association, Dr. Longjohn is a member of the LA County Sheriff’s Department Medical Reserve Company 206 (Office of Homeland Security) and also volunteers as a flight physician for the LA County Sheriff’s Department Air Rescue 5. Dr. Longjohn has been honored with several teaching awards. His current research focus is on clinical and biomechanical studies relating to joint replacement and arthroplasty revision techniques and materials. Dr. Longjohn did his residency in orthopaedic surgery at USC+LAC and completed a fellowship in arthritis and joint implant surgery at Rancho Los Amigos National Rehabilitation Center/Keck Hospital of USC.


Los Angeles Magazine: Super Doctor, 2016

Castle Connolly: Amreica's Top Doctors, 2016


Knusten AR, Ebramzadeh E, Longjohn DB, Sangiorgio SN. Systematic analysis of bisphosphonate intervention on periprosthetic BMD as a function of stem design. J Arthroplasty. 2014 Jun; 29(6):1292-7. View in: PubMed

Sangiorgio SN, Longjohn DB, Dorr LD, Ebramzadeh E. Challenges in relating experimental hip implant fixation predictions to clinical observations. J Biomech. 2011 Jan 11; 44(2):235-43. View in: PubMed

Sangiorgio SN, Longjohn DB, Dorr LD, Ebramzadeh E. The influence of proximal stem geometry and surface finish on the fixation of a double-tapered cemented femoral stem. J Biomech. 2011 Jan 4; 44(1):22-7. View in: PubMed

Sangiorgio SN, Longjohn DB, Lee JL, Alexander JD, Dorr LD, Ebramzadeh E. Simulation of extreme loads on the proximal femur for implant fixation assessment. J Appl Biomater Biomech. 2008 May-Aug; 6(2):72-80. View in: PubMed

Sangiorgio SN, Ebramzadeh E, Longjohn DB, Dorr LD. Effects of dorsal flanges on fixation of a cemented total hip replacement femoral stem. J Bone Joint Surg Am. 2004 Apr; 86-A(4):813-20. View in: PubMed

Ebramzadeh E, Sangiorgio SN, Longjohn DB, Buhari CF, Dorr LD. Initial stability of cemented femoral stems as a function of surface finish, collar, and stem size. J Bone Joint Surg Am. 2004 Jan; 86-A(1):106-15. View in: PubMed

Ebramzadeh E, Sangiorgio SN, Longjohn DB, Buhari CF, Morrison BJ, Dorr LD. Effects of total hip arthroplasty cemented femoral stem surface finish, collar and cement thickness on load transfer to the femur. J Appl Biomater Biomech. 2003 Jan-Apr; 1(1):76-83. View in: PubMed

Haft GF, Heiner AD, Callaghan JJ, Dorr LD, Wan Z, Long W, Longjohn DB, Brown TD. Polyethylene liner cementation into fixed acetabular shells. J Arthroplasty. 2002 Jun; 17(4 Suppl 1):167-70. View in: PubMed

Udomkiat P, Dorr LD, Won YY, Longjohn D, Wan Z. Technical factors for success with metal ring acetabular reconstruction. J Arthroplasty. 2001 Dec; 16(8):961-9. View in: PubMed

Min B, Longjohn DB, Dorr LD, Wan Z. Radiographic comparison of diaphyseal grit blasted with smooth surface stems by matched pair analysis. Clin Orthop Relat Res. 2000 Dec; (381):156-67. View in: PubMed

Dorr LD, Wan Z, Longjohn DB, Dubois B, Murken R. Total hip arthroplasty with use of the Metasul metal-on-metal articulation. Four to seven-year results. J Bone Joint Surg Am. 2000 Jun; 82(6):789-98. View in: PubMed

Longjohn DB, Dorr LD, McPherson EJ. Blood management challenges in revision hip arthroplasty. Orthopedics. 1999 Jan; 22(1 Suppl):s148-50. View in: PubMed

Longjohn D, Dorr LD. Soft tissue balance of the hip. J Arthroplasty. 1998 Jan; 13(1):97-100. View in: PubMed

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