Erik Hansen, MD
Associate Professor
Orthopaedic Surgery
School of Medicine

Apart from his clinical practice, Dr. Hansen has a strong commitment to clinical research dating back to his medical school education. At that time, he took an additional year off to work in an orthopaedic basic science laboratory to understand the fundamentals of fracture healing. In residency, he was selected from his class to do an extra year of research, during which time he worked on several clinical projects focused on total joint replacement, orthopaedic trauma, and medical education. Over the past several years, multiple projects which he has collaborated on have been recognized for prestigious national awards, including the James A. Rand Young Investigator Award, the Mark Coventry Award, and the Chitranjan Ranawat Award. He currently serves as the UCSF lead investigator collaborating with several other major academic institutions on multicenter, prospective randomized clinical trials focused on improving outcomes following revision joint replacement surgery.

Dr. Hansen completed his undergraduate education in Human Biology at Stanford University. Following this time, he spent a year in Mainland China studying acupuncture and Traditional Chinese Medicine as well as an additional year in Mexico volunteering in a hospital. As a result of these experiences, he is proficient in both Mandarin Chinese as well as Spanish in the clinical setting. He then matriculated at the University of California, San Francisco medical school, than continued on at UCSF for completion of his orthopaedic surgery residency training. Dr. Hansen then went to the prestigious Rothman Institute at Thomas Jefferson University Hospital in Philadelphia for an Adult Reconstruction fellowship. He was hired back to UCSF the year after, and is beginning his 5th year of practice.

• Child-Pugh Class B or C Liver Disease Increases the Risk of Early Mortality in Patients With Hepatitis C Undergoing Elective Total Joint Arthroplasty Regardless of Treatment Status.
  Clinical orthopaedics and related research 2023 Cichos KH, Jordan E, Niknam K, Chen AF, Hansen EN, McGwin G, Ghanem ES
• Comparison of Static and Articulating Spacers After Periprosthetic Joint Infection.
  Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews 2023 Warwick HS, Tan TL, Weiser L, Shau DN, Barry JJ, Hansen EN
• Total Joint Arthroplasty Should Not Be Delayed in Hepatitis C Patients After Successful Treatment Achieving a Sustained Viral Load.
  Arthroplasty today 2022 Cichos KH, Jordan E, Niknam K, Chen AF, Hansen EN, McGwin G, Ghanem ES
• Imaging joint infections using D-methyl-11C-methionine PET/MRI: initial experience in humans.
  European journal of nuclear medicine and molecular imaging 2022 Polvoy I, Seo Y, Parker M, Stewart M, Siddiqua K, Manacsa HS, Ravanfar V, Blecha J, Hope TA, Vanbrocklin H, Flavell RR, Barry J, Hansen E, Villanueva-Meyer JE, Engel J, Rosenberg OS, Wilson DM, …
• An Enhanced Understanding of Culture-Negative Periprosthetic Joint Infection with Next-Generation Sequencing: A Multicenter Study.
  The Journal of bone and joint surgery. American volume 2022 Goswami K, Clarkson S, Phillips CD, Dennis DA, Klatt BA, O'Malley MJ, Smith EL, Gililland JM, Pelt CE, Peters CL, Malkani AL, Palumbo BT, Lyons ST, Bernasek TL, Minter J, Goyal N, McDonald JF, Cross …
• Infection and Mechanical Complications Are Risk Factors for New Diagnosis of a Mental Health Disorder After Total Joint Arthroplasty.
  Arthroplasty today 2021 Figoni AM, Lalchandani GR, Markes AR, Sing D, Hansen EN
• Continuous Lumbar Plexus Block vs Continuous Lumbar Erector Spinae Plane Block for Postoperative Pain Control After Revision Total Hip Arthroplasty.
  Arthroplasty today 2021 Chen A, Kolodzie K, Schultz A, Hansen EN, Braehler M
• Tibial Mechanical Axis Is Nonorthogonal to the Floor in Varus Knee Alignment.
  Arthroplasty today 2021 Bini SA, Chung CC, Wu SA, Hansen EN
• External Validation Demonstrates Limited Clinical Utility of a Preoperative Prognostic Calculator for Periprosthetic Joint Infection.
  The Journal of arthroplasty 2021 Monárrez R, Maltenfort MG, Figoni A, Szapary HJ, Chen AF, Hansen EN, Kheir MM
• The Role of Cannabis in Orthopedic Surgery.
  SN Comprehensive Clinical Medicine 2020 David C. Sing, Paul Tornetta, Erik N. Hansen
• 2020 Mark Coventry Award: Microorganism-directed oral antibiotics reduce the rate of failure due to further infection after two-stage revision hip or knee arthroplasty for chronic infection: a multicentre randomized controlled trial at a minimum of two years.
  The bone & joint journal 2020 Yang J, Parvizi J, Hansen EN, Culvern CN, Segreti JC, Tan T, Hartman CW, Sporer SM, Della Valle CJ, Knee Society Research Group
• A Goal-directed Quality Improvement Initiative to Reduce Opioid Prescriptions After Orthopaedic Procedures.
  Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews 2019 Choo KJ, Grace TR, Khanna K, Barry J, Hansen EN
• Reporters of TCR signaling identify arthritogenic T cells in murine and human autoimmune arthritis.
  Proceedings of the National Academy of Sciences of the United States of America 2019 Ashouri JF, Hsu LY, Yu S, Rychkov D, Chen Y, Cheng DA, Sirota M, Hansen E, Lattanza L, Zikherman J, Weiss A
• Unicondylar Knee Arthroplasty Has Fewer Complications but Higher Revision Rates Than Total Knee Arthroplasty in a Study of Large United States Databases.
  The Journal of arthroplasty 2019 Hansen EN, Ong KL, Lau E, Kurtz SM, Lonner JH
• Potent Anticoagulation Does Not Reduce Venous Thromboembolism in High-Risk Patients.
  The Journal of bone and joint surgery. American volume 2019 Tan TL, Foltz C, Huang R, Chen AF, Higuera C, Siqueira M, Hansen EN, Sing DC, Parvizi J
• The hip-spine relationship and its effect on total hip arthroplasty outcomes: What do the databases show?.
  Seminars in Arthroplasty 2018 Jeffrey J. Barry, Erik N. Hansen
• Unicondylar Knee Arthroplasty in the U.S. Patient Population: Prevalence and Epidemiology.
  American journal of orthopedics (Belle Mead, N.J.) 2018 Hansen EN, Ong KL, Lau E, Kurtz SM, Lonner JH
• Pediatric Solid Tumors in Resource-Constrained Settings: A Review of Available Evidence on Management, Outcomes, and Barriers to Care.
  Children (Basel, Switzerland) 2018 Carter NH, Avery AH, Libes J, Lovvorn HN, Hansen EN
• Incorporation of a Global Surgery Rotation into an Academic General Surgery Residency Program: Impact and Perceptions.
  World journal of surgery 2018 LeCompte MT, Goldman C, Tarpley JL, Tarpley M, Hansen EN, Nthumba PM, Terhune KP, Kauffmann RM
• Paediatric and obstetric outcomes at a faith-based hospital during the 100-day public sector physician strike in Kenya.
  BMJ global health 2018 Adam MB, Muma S, Modi JA, Steere M, Cook N, Ellis W, Chen CT, Shirk A, Muma Nyagetuba JK, Hansen EN
• Does Intrathecal Morphine in Spinal Anesthesia Have a Role in Modern Multimodal Analgesia for Primary Total Joint Arthroplasty?
  The Journal of arthroplasty 2018 Cheah JW, Sing DC, Hansen EN, Aleshi P, Vail TP
• Methylene Blue-Guided Debridement as an Intraoperative Adjunct for the Surgical Treatment of Periprosthetic Joint Infection.
  The Journal of arthroplasty 2017 Shaw JD, Miller S, Plourde A, Shaw DL, Wustrack R, Hansen EN
• Pediatric solid tumors in Africa: different biology?
  Current opinion in pediatrics 2017 Nyagetuba JKM, Hansen EN
• Preoperative Anemia Independently Predicts 30-Day Complications After Aseptic and Septic Revision Total Joint Arthroplasty.
  The Journal of arthroplasty 2017 Lu M, Sing DC, Kuo AC, Hansen EN
• The James A. Rand Young Investigator's Award: Administrative Claims vs Surgical Registry: Capturing Outcomes in Total Joint Arthroplasty.
  The Journal of arthroplasty 2017 Patterson JT, Sing D, Hansen EN, Tay B, Zhang AL
• Spinal Realignment for Adult Deformity: Three-column Osteotomies Alter Total Hip Acetabular Component Positioning.
  The Journal of the American Academy of Orthopaedic Surgeons 2017 Barry JJ, Yucekul A, Theologis AA, Hansen EN, Ames C, Deviren V
• Chapter 40 Hip Hemiarthroplasty.
  Case Competencies in Orthopaedic Surgery 2017 Paul Hyunsoo Yi, Erik Nathan Hansen
• Hydrogen Peroxide Wound Irrigation in Orthopaedic Surgery.
  Journal of bone and joint infection 2017 Lu M, Hansen EN
• Length of Endoprosthetic Reconstruction in Revision Knee Arthroplasty Is Associated With Complications and Reoperations.
  Clinical orthopaedics and related research 2017 Barry JJ, Thielen Z, Sing DC, Yi PH, Hansen EN, Ries M
• The Mark Coventry, MD, Award: Oral Antibiotics Reduce Reinfection After Two-Stage Exchange: A Multicenter, Randomized Controlled Trial.
  Clinical orthopaedics and related research 2017 Frank JM, Kayupov E, Moric M, Segreti J, Hansen E, Hartman C, Okroj K, Belden K, Roslund B, Silibovsky R, Parvizi J, Della Valle CJ, Knee Society Research Group
• Direct Measurement of Tissue Oxygenation as a Method of Diagnosis of Acute Compartment Syndrome.
  Journal of orthopaedic trauma 2016 Weick JW, Kang H, Lee L, Kuether J, Liu X, Hansen EN, Kandemir U, Rollins MD, Mok JM
• Comparison of Complications Following Revision of Metal-on-Metal Versus Metal-on-Polyethylene Total Hip Arthroplasty.
  Orthopedics 2016 Nishio S, Fukunishi S, Yoshiya S, Sing DC, Hansen EN, Vail TP
• A Resident-led Initiative Improves Screening and Treatment for Vitamin D Deficiency in Patients with Hip Fractures.
  Clinical orthopaedics and related research 2016 Lansdown DA, Whitaker A, Wustrack R, Sawyer A, Hansen EN
• Early Outcomes of Primary Total Hip Arthroplasty After Prior Lumbar Spinal Fusion.
  The Journal of arthroplasty 2016 Barry JJ, Sing DC, Vail TP, Hansen EN
• Long-Acting Opioid Use Independently Predicts Perioperative Complication in Total Joint Arthroplasty.
  The Journal of arthroplasty 2016 Sing DC, Barry JJ, Cheah JW, Vail TP, Hansen EN
• Prior Lumbar Spinal Arthrodesis Increases Risk of Prosthetic-Related Complication in Total Hip Arthroplasty.
  The Journal of arthroplasty 2016 Sing DC, Barry JJ, Aguilar TU, Theologis AA, Patterson JT, Tay BK, Vail TP, Hansen EN
• Significant Functional Improvement at 2 Years After Isolated Patellofemoral Arthroplasty With an Onlay Trochlear Implant, But Low Mental Health Scores Predispose to Dissatisfaction.
  The Journal of arthroplasty 2015 Kazarian GS, Tarity TD, Hansen EN, Cai J, Lonner JH
• Evaluating patient education material regarding unicompartmental knee arthroplasty.
  The Knee 2015 Wong K, Mohan R, Yi PH, Hansen EN
• Intraoperative Purulence Is Not Reliable for Diagnosing Periprosthetic Joint Infection.
  The Journal of arthroplasty 2015 Alijanipour P, Adeli B, Hansen EN, Chen AF, Parvizi J
• Evaluating online information regarding the direct anterior approach for total hip arthroplasty.
  The Journal of arthroplasty 2015 Mohan R, Yi PH, Hansen EN
• Comment on "perioperative administration of selective cyclooxygenase-2 inhibitors for postoperative pain management in patients after total knee arthroplasty".
  The Journal of arthroplasty 2014 Yi PH, Haughom BD, Hansen EN
• Perioperative antibiotics.
  Journal of orthopaedic research : official publication of the Orthopaedic Research Society 2014 Hansen E, Belden K, Silibovsky R, Vogt M, Arnold W, Bicanic G, Bini S, Catani F, Chen J, Ghazavi M, Godefroy KM, Holham P, Hosseinzadeh H, Kim KI, Kirketerp-Møller K, Lidgren L, Lin JH, Lonner JH, …
• Perioperative antibiotics.
  The Journal of arthroplasty 2013 Hansen E, Belden K, Silibovsky R, Vogt M, Arnold WV, Bicanic G, Bini SA, Catani F, Chen J, Ghazavi MT, Godefroy KM, Holham P, Hosseinzadeh H, Kim KI, Kirketerp-Møller K, Lidgren L, Lin JH, Lonner JH, …
• Routine use of antibiotic laden bone cement for primary total knee arthroplasty: impact on infecting microbial patterns and resistance profiles.
  The Journal of arthroplasty 2013 Hansen EN, Adeli B, Kenyon R, Parvizi J
• Negative pressure wound therapy is associated with resolution of incisional drainage in most wounds after hip arthroplasty.
  Clinical orthopaedics and related research 2013 Hansen E, Durinka JB, Costanzo JA, Austin MS, Deirmengian GK
• Outcome of one-stage cementless exchange for acute postoperative periprosthetic hip infection.
  Clinical orthopaedics and related research 2013 Hansen E, Tetreault M, Zmistowski B, Della Valle CJ, Parvizi J, Haddad FS, Hozack WJ
• Rotational malreduction of the syndesmosis: reliability and accuracy of computed tomography measurement methods.
  Foot & ankle international 2013 Knops SP, Kohn MA, Hansen EN, Matityahu A, Marmor M
• Comparison of tissue oxygenation and compartment pressure following tibia fracture.
  Injury 2012 Hansen EN, Manzano G, Kandemir U, Mok JM
• Impact of a three-dimensional "hands-on" anatomic teaching module on acetabular fracture pattern recognition by orthopaedic residents.
  The Journal of bone and joint surgery. American volume 2012 Hansen E, Marmor M, Matityahu A
• Periprosthetic joint infection: what is on the horizon?
  The International journal of artificial organs 2012 Hansen EN, Zmistowski B, Parvizi J
• Diagnosis of Acute Compartment Syndrome.
  Techniques in Orthopaedics 2012 James Moon Mok, Erik N. Hansen, Heejae Kang, Utku Kandemir
• Limitations of standard fluoroscopy in detecting rotational malreduction of the syndesmosis in an ankle fracture model.
  Foot & ankle international 2011 Marmor M, Hansen E, Han HK, Buckley J, Matityahu A
• Irrigation and debridement for periprosthetic infections: does the organism matter?
  The Journal of arthroplasty 2011 Odum SM, Fehring TK, Lombardi AV, Zmistowski BM, Brown NM, Luna JT, Fehring KA, Hansen EN, Periprosthetic Infection Consortium
• Does a cemented cage improve revision THA for severe acetabular defects?
  Clinical orthopaedics and related research 2011 Hansen E, Shearer D, Ries MD
• The Chitranjan Ranawat Award: fate of two-stage reimplantation after failed irrigation and débridement for periprosthetic knee infection.
  Clinical orthopaedics and related research 2011 Sherrell JC, Fehring TK, Odum S, Hansen E, Zmistowski B, Dennos A, Kalore N, Periprosthetic Infection Consortium
• Who should pay for revision total joint arthroplasty?.
  Current Orthopaedic Practice 2011 Erik N. Hansen, Kevin J. Bozic
• Impaired remodeling phase of fracture repair in the absence of matrix metalloproteinase-2.
  Disease models & mechanisms 2010 Lieu S, Hansen E, Dedini R, Behonick D, Werb Z, Miclau T, Marcucio R, Colnot C
• Periprosthetic joint infection: the economic impact of methicillin-resistant infections.
  The Journal of arthroplasty 2010 Parvizi J, Pawasarat IM, Azzam KA, Joshi A, Hansen EN, Bozic KJ
• Cost and effectiveness of postoperative fever diagnostic evaluation in total joint arthroplasty patients.
  The Journal of arthroplasty 2010 Ward DT, Hansen EN, Takemoto SK, Bozic KJ
• Periprosthetic Joint Infection: The Economic Impact of Methicillin Resistant Infections.
  The Journal of Arthroplasty 2010 Javad Parvizi, Ian Pawasarat, Khalid Azzam, Erik N. Hansen, Kevin J. Bozic, Matthew S. Austin
• The impact of disruptive innovations in orthopaedics.
  Clinical orthopaedics and related research 2009 Hansen E, Bozic KJ
• Effect of age on vascularization during fracture repair.
  Journal of orthopaedic research : official publication of the Orthopaedic Research Society 2008 Lu C, Hansen E, Sapozhnikova A, Hu D, Miclau T, Marcucio RS
• The economics of minimally invasive total knee arthroplasty.
  The journal of knee surgery 2006 Bozic KJ, Hansen E
• An evaluation of information available on the internet regarding minimally invasive hip arthroplasty.
  The Journal of arthroplasty 2006 Labovitch RS, Bozic KJ, Hansen E
• Revision total hip arthroplasty for large medial (protrusio) defects with a rim-fit cementless acetabular component.
  The Journal of arthroplasty 2006 Hansen E, Ries MD
• Cellular basis for age-related changes in fracture repair.
  Journal of Orthopaedic Research® 2005 C LU, T MICLAU, D HU, E HANSEN, K TSUI, C PUTTLITZ, R MARCUCIO
• Cellular basis for age-related changes in fracture repair.
  Journal of orthopaedic research : official publication of the Orthopaedic Research Society 2005 Lu C, Miclau T, Hu D, Hansen E, Tsui K, Puttlitz C, Marcucio RS