This page lists research presentations given by OHSU faculty, fellows, residents and medical students at orthopaedic meetings and conferences. The research is grouped by the event at which it was presented.

2023 AAOS Annual Meeting

2022 Annual Meeting of the American Association of Hip and Knee Surgeons (AAHKS 2022)

2022 Orthopaedic Trauma Association Annual Meeting (OTA 2022)

2023 American Academy of Orthopaedic Surgeons Annual Meeting

The AAOS Annual Meeting is described as being the largest and most comprehensive orthopaedic educational experience. Orthopaedic professionals from around the world attend to update their clinical, scientific, surgical technology and practice management knowledge and expertise. The meeting includes posters, presentations, symposia, tech talks, expert sessions and more.

Tuesday, 3/7/23

Spine Poster PO363:  The Rates of Negative Outcomes for Underweight Patients Undergoing Posterior Lumbar Interbody Fusion Rival or Exceed those of Morbidly Obese Patients 
Bianca Robison, Spencer Smith, PI : Jung Yoo, MD 

Poster PO492:  Surgeon Estimated Blood Loss is Discordant with Calculated Blood Loss in Acetabular and Pelvic Fracture Surgery 
Sarah Lindsay, MD, Natasha McKibben, BS, Qian Yang, Zachary Working, MD, Natalie Zusman, MD, PI: Darin Friess, MD 

Musculoskeletal Oncology Poster P0185:  Natural Language Processing of Pathology Reports Identifies Soft Tissue Sarcomas Missed by International Classification of Diseases Codes in the Veterans Administration National Database
Presented by PGY-3 Sarah Lindsay, MD
Cecelia Madison, James Hayden, MD/PhD, Yee-Cheen Doung, MD,  PI: Kenneth Gundle, MD 

Spine Paper P030:  Posterior Fixation without Debridement for Vertebral Body Osteomyelitis and Discitis: A 10-Year Retrospective Review 
Presented by PGY-3 Sarah Lindsay, MD
Jung Yoo, MD, Hanne Gehling, BS, PI: Travis Philipp, MD 

Adult Recon Hip Poster:  Femoral Component Design Influences Risk of Periprosthetic Femur Fracture after Total Hip Arthroplasty: An Analysis from the American Joint Replacement Registry&
Primary Author PGY-3 Mackenzie Kelly, MD.
Zachary Working, MD, PI: Ryland Kagan, MD 

Wednesday, 3/8/23

Paper 074:  Lower Revision Risk with All-Polyethylene Tibial Components in Total Knee Arthroplasty: An Analysis of the American Joint Replacement Registry
Presented by PGY-5 Jamil Kendall, MD, PI: Ryland Kagan, MD 

Paper 075:  Increased Revision Risk with Rotating Platform Bearings in Total Knee Arthroplasty: An Analysis of the American Joint Replacement Registry
Presented by Vishal Hegde, MD
Jamil Kendall, MD, Katie Schabel, MD, PI: Ryland Kagan, MD 

Paper 108:  Increased Risk of Postoperative Periprosthetic Femur Fracture with Cementless Versus Cemented Hemiarthroplasty: A Nationwide Database Study of 24,468 Femoral Neck Gractures 
Presented by PGY-4 Frank Rodgers, MD 
Zachary Working, MD, Darin Friess, MD, Jung Yoo, MD, PI: Ryland Kagan, MD 

Podium Paper Presentation 102:  Cemented Femoral Fixation for Total Hip Arthroplasty Reduces the Risk of Periprosthetic Femur Fracture in Patients 65 Years or Older: An Analysis from the American Joint Replacement Registry 
Presented by PGY-3 Mackenzie Kelly, MD
Zachary Working, MD, PI: Ryland Kagan, MD 

Podium Spine IV  Paper 194:  Blame the Opioids not the Spine Surgeon: Dislocation Risk is Associated with Preoperative Opiate Use in Lumbar Spine Fusion Patients after Total Hip Arthroplasty 
Presented by Ryland Kagan, MD 
Travis Phillipp, MD, Sebastian Welling, MD, Spencer Smith, BS, PI: Jung Yoo, MD 

Poster P0028:  Femoral Component Design Influences Risk of Periprosthetic Femur Fracture after Total Hip Arthroplasty: An Analysis from the American Joint Replacement Registry 
Mackenzie Kelly, MD, Zachary Working, MD, PI: Ryland Kagan, MD 

Spine Poster Session P0363:  The Rates of Negative Outcomes for Underweight Patients Undergoing Posterior Lumbar Interbody Fusion Rival or Exceed those of Morbidly Obese Patients 
Bianca Robison, Spencer Smith, PI : Jung Yoo, MD 

Adult Recon Hip Poster:  Femoral Component Design Influences Risk of Periprosthetic Femur Fracture after Total Hip Arthroplasty: An Analysis from the American Joint Replacement Registry
Primary Author PGY-3 Mackenzie Kelly, MD. 
Zachary Working, MD, PI: Ryland Kagan, MD

Thursday, 3/9/23

Podium Presentation Trauma V Papers P255:  Enoxaparin use in the early postoperative period after tibial nailing is associated with significant increase in rate of nonunion and revision surgery 
Presented by PGY-3 Sarah Lindsay, MD  
Darin Friess, MD, Zachary Working, MD, PI: Jung Yoo, MD 

Symposium presentation:  Stress and Chronic Effects of Workplace Violence, in President’s Symposium on Workplace Violence 
Speaker: RM Orfaly, MD 
Other symposium speakers: Savoie FH, Guy D, Mejia A, Hawkins B 

Podium Paper Presentation  Practice Management/Rehabilitation II:  Effect of Level I Trauma Call on Orthopaedic Attending Sleep Behavior and Physiologic Recovery: A Prospective Longitudinal Study 
Presented by Michelle Lawson PGY-4,  
Karalynn Lancaster, BS, Colin Lipps, BS PI: Jacqueline Brady, MD and Zachary Working, MD  

TechTalk Digital Orthopaedics:  Telehealth etc. Moderator Ryland Kagan, MD 

Single-Incision Fasciotomy Compared to Dual-Incision Fasciotomy in Treatment of Tibial Plateau Fractures with Acute Compartment Syndrome
Presented by Graham DeKeyser, MD 

Paper 259 High Energy Pilon Fractures Result in Significant Chondrocyte Cell Death on Both the Tibia and Talar Side of Injury
Presented by Graham DeKeyser, MD 

Friday, 3/10/23

Podium presentation Paper 408: Pediatric and Adult Patients have Similar Functional Improvement after Endoprosthetic Reconstruction of Lower Extremity Tumors
Presented by Tina Tran, MS3
Kenneth Gundle, MD, James Hayden, MD/PhD, PI Yee-Cheen Doung, MD 

Paper 375: Risk Factors for Instability after Hip Arthroplasty for Femoral Neck Fractures
Presented by Graham DeKeyser, MD 

Symposium Presentation - Sports: Addressing Controversies and Achieving Consensus in the Management of Multiligament Knee injuries (MLK): Surgical Timing and Rehabilitation (STaR) MLKI Study Group
Jacqueline Brady, MD: High Yield Advice for Clinical & Radiographic Evaluation for Multiligament Knee Injuries

Podium Paper Presentation - Trauma VI: The Tip of the Iceberg: Are We Underestimating Blood Loss in Percutaneously Treated Pelvic Fractures?
Presented by Michelle Lawson PGY-4, PI Dr. Zachary Working, MD   

Poster PO699: Demographic and Clinical Characteristics of Patellar Instability Patients from Prospective JUPITER (Justifying Patellar Instability Treatment by Early Results Cohort)
Jacqueline Brady, MD 

Saturday, 3/11/23

OTA/RJOS Specialty Society Program
Single-Incision Fasciotomy Compared to Dual-Incision Fasciotomy in Treatment of Tibial Plateau Fractures with Acute Compartment Syndrome
Presented by Graham DeKeyser, MD 

Paper - Oct 12, 2022 Paper Session III: Fracture Healing & Clinical Models

Collagen X Biomarker Correlates to Canonical Bone Turnover Markers During Fracture Healing and Distinguishes Sex-Related Differences in Soft Callus Formation

Zachary Mark Working MD; Kelsey O'Hara BS; Anna Laura Nelson MS; Ryan Coghlan BS; Lucas Scott Marchand MD; Sofia Bzovsky MSc; Sheila Sprague PhD; Nathan N O'Hara PhD; Gerard Slobogean MD; Chelsea S Bahney PhD

Paper - Oct 12, 2022 Paper Session III: Fracture Healing & Clinical Models

Collagen X Longitudinal Fracture Biomarker Suggests Staged Fixation in Tibial Plateau Fractures Delays Rate of Endochondral Repair

Zachary Mark Working MD; Danielle Peterson MD; Michelle Lawson MD; Kelsey O'Hara BS; Ryan Coghlan MS; Matthew T Provencher MD; Darin M Friess MD; Brian Johnstone PhD; Theodore Miclau MD; Chelsea S Bahney PhD

Paper - Oct 13, 2022 Annual Meeting - Paper Session I

Increased Risk of Postoperative Periprosthetic Femur Fracture With Uncemented Versus Cemented Hemiarthroplasty: A Nationwide Database Study of 24,468 Femoral Neck Fractures

Frank Rodgers MD; Qian Yang MPH; Darin M Friess MD; Zachary Mark Working MD; Jung U Yoo MD; Ryland Phillip Kagan MD

Paper - Oct 13, 2022 Annual Meeting - Paper Session I

Risk Factors for Instability after Hip Arthroplasty for Femoral Neck Fracture

Jeffrey Frandsen MD; Graham John Dekeyser MD; Brenna Blackburn PhD; The Arthroplasty for Hip Fracture Consortium; Jeremy Gililland MD
University of Utah, Salt Lake City, UT, United States

Paper - Oct 13, 2022 Annual Meeting - Paper Session I

Nail-Plate Fixation for Distal Femur Fractures: A Multicenter Case Series

Brendan Shi MD; Benjamin Kelley MD; Dane Jensen Brodke MD; Alexander Upfill-Brown MD; Sai Devana MD; Nathan N O'Hara PhD; Cynthia Burke BS; Jayesh Gupta BS; Natasha McKibben BS; Robert V O'Toole MD; John Morellato MBBS; William Hunter Gillon MD; Murphy McGriff Walters MD; Colby Barber MD; Paul William Perdue MD; Graham John Dekeyser MD; Lillia Steffenson MD; Lucas Scott Marchand MD; Marshall James Fairres MD; Stephen J Shymon MD; Loren O Black MD; Zachary Mark Working MD; Trevor Gulbrandsen MD; Matthew Hogue MD; Omar Hammad Atassi MD; Thomas W. Mitchell MD; Erika Roddy MD; Ashraf N El Naga MD; Christopher Lee MD

Paper - Oct 13, 2022 Annual Meeting - Paper Session I

Risk Factors for Reoperation to Promote Union in 1128 Distal Femur Fractures

Dane Jensen Brodke MD; Sai Devana MD; Adolfo Hernandez MS; Nathan N O'Hara PhD; Cynthia Burke BS; Jayesh Gupta BS; Natasha McKibben BS; Robert V O'Toole MD; John Morellato MBBS; Murphy McGriff Walters MD; William Hunter Gillon MD; Colby Barber MD; Paul William Perdue MD; Graham John Dekeyser MD; Lillia Steffenson MD; Lucas Scott Marchand MD; Stephen J Shymon MD; Marshall James Fairres MD; Loren O Black MD; Zachary Mark Working MD; Matthew Hogue MD; Trevor Gulbrandsen MD; Omar Hammad Atassi MD; Thomas W. Mitchell MD; Erika Roddy MD; Ashraf N El Naga MD; Christopher Lee MD

Paper - Oct 13, 2022 Annual Meeting - Paper Session I

Malreduction Is the Most Important Technical Factor Contributing to Nonunion in Supracondylar Distal Femur Fractures Treated With Lateral Locked Plating

David John Stockton MD; Nathan N O'Hara PhD; Dane Jensen Brodke MD; Natasha McKibben BS; Kathleen Marie Healey BA; Abraham Michael Goch MD; Haley Demyanovich MS; Lucas Scott Marchand MD; Stephen J Shymon MD; Paul William Perdue MD; Omar Hammad Atassi MD; Zachary Mark Working MD; Ashraf N El Naga MD; Matthew Hogue MD; John Morellato MBBS; Eric Hempen MD; Gerard Slobogean MD; Christopher Lee MD; Robert V O'Toole MD

Paper - Oct 13, 2022 Paper Session V: Post-Traumatic OA

High-Energy Pilon Fractures Result in Significant Chondrocyte Cell Death on Both the Tibia and Talar Side of Injury

Justin Haller MD; Graham John Dekeyser MD

Paper - Oct 14, 2022 Annual Meeting - Paper Session IV

Single-Incision Fasciotomy Decreases Infection Risk Compared to Dual-Incision Fasciotomy in Treatment of Tibial Plateau Fractures With Acute Compartment Syndrome

Graham John Dekeyser MD; Eli w. Bunzel MD; Dillon Christopher O'Neill MD; Sean E Nork MD; Justin Haller MD; David Barei MD

Paper - Oct 14, 2022 Annual Meeting - Paper Session V

Is Iliosacral Screw Removal Useless? A Causal Analysis of Prospective Observational Data

Natasha McKibben BS; Nicolas H Zingas BS; Kathleen Marie Healey BA; Caroline Ann Benzel BS; David John Stockton MD; Haley Demyanovich MS; Gerard Slobogean MD; Robert V O'Toole MD; Marcus F Sciadini MD; Nathan N O'Hara PhD

Paper - Oct 14, 2022 Annual Meeting - Paper Session V

Risk of Revision and Complications: An Analysis of 956 Total Hip Arthroplasty Procedures for Acute Treatment of Acetabular Fractures

Danielle Peterson MD; Mackenzie Kelly MD; Darin M Friess MD; Jung U Yoo MD; Zachary Mark Working MD; Ryland Phillip Kagan MD

Paper - Oct 15, 2022 Annual Meeting - Paper Session VIII

The LIMB-Q: A Novel Patient-Reported Outcomes Instrument Specific to Lower-Extremity Trauma Patients

Lily Mundy MD; Anne Klaasen PhD; ANDREA PUSIC MD; Tim De Jong; Nicole Lindenblatt MD; Nina Vestergaard Simonsen MD; Lotte Poulsen MD; Ariana Paniagua BA; Natasha McKibben BS; Nicolas H Zingas BS; Kathleen Marie Healey BA; Raymond A Pensy MD; Scott Hollenbeck MD; Mark Gage MD

Poster – Annual Meeting #124

Does the Matta Acetabular Fracture Nomogram Have External Validity?: Evaluation Over 10 Years at an Academic Level 1 Trauma Center Acetabular Service with 2 Years of Follow Up

Catherine Hutchison MD, Natalie Lacey Zusman MD, Natasha McKibben, Karalynn Lancaster, Qian Yang MPH, Darin Friess MD MPH, Zachary M Working MD