Research Fellows

The Campbell Foundation

The Campbell Foundation was established in 1946 and is affiliated with Campbell Clinic Orthopaedics in Memphis, Tennessee. A scientific and charitable trust, The Campbell Foundation was founded by Dr. Willis C. Campbell’s partners to continue his commitment to the advancement of orthopaedic medicine. The Campbell Foundation receives support from grateful patients, physicians, resident and fellow alumni, staff, trustees, corporations and friends in the community.

The mission of The Campbell Foundation is to enhance quality of life through the science of orthopaedic medicine worldwide. Since its inception, The Campbell Foundation has been committed to advancing surgeon education, orthopaedic research and community healthcare.

In recent years, we have focused on strengthening and building our clinical and biomechanical research infrastructure, which includes multiple research nurse coordinators, database access to track patient outcomes, a biomechanics laboratory and an extensive orthopaedic library staffed by a full‐time librarian. We currently are conducting over 150 active clinical and biomechanical research projects, sharing our research at regional, national, and international meetings, and in academic and scientific publications.

Key Campbell Foundation/Research Staff

Jenny Koltnow; Executive Director

Since 2020, Jenny has led the Foundation staff, including responsibilities for development and research processes. This includes:

Securing funding to support the Foundation’s orthopaedic research, surgeon education and community outreach programs
Identification, cultivation, solicitation and stewardship of donors
Education of and communication with current and prospective donors about our mission and programs (Website, Social Media, Momentum, Campbell in Motion, etc.)
Coordination and implementation of clinical and translational research studies and associated scientific publications and regulatory affairs

Karen Romer, RN, BSN; Research Nurse Coordinator

Karen joined The Campbell Foundation Staff in 2017. She coordinates all research projects for the Neuromuscular/Cerebral Palsy Clinic and participates in patient care at the Clinic. She assists with pediatric orthopaedic research at Campbell Clinic and Le Bonheur Children’s Hospital. Her duties include reviewing new research protocols and providing feedback on feasibility, preparing documentation for initial and continuing IRB review and ensuring that all research procedures are conducted per the protocol. She recruits potential research participants, collecting and maintaining data as needed.

Jonathan Rowland, BS, CCRP; Clinical Research Coordinator

With more than 17 years of pediatric research experience, Jonathan joined the Le Bonheur Children’s Hospital Department of Pediatric Orthopedics in March, 2018. He assumes primary responsibility for the coordination of orthopaedic clinical research studies at Le Bonheur, organizing and managing activities related to initial and continuing IRB review and serving as study contact. He reviews patient records, recruits potential research participants, collects data and ensures that all procedures are conducted in compliance with the protocol, federal regulations and Good Clinical Practice guidelines.

Editorial Staff

The Editorial Staff is a resource available for fellows. Services include:

Graphic design, research, writing and editing of orthopaedic publications and presentations for staff physicians and residents
Maintenance of publication library
Coordination of surgeon residency and fellowship programs to include interview process, selection, correspondence, credentialing and record keeping

Former Pediatric Research Fellows

Physician	Fellowship Year	Current Location
Okan, Aslantürk	2024	Department of Orthopaedics and Traumatology, Turgut Ozal Medical Center, Inonu University School of Medicine Malatya, Turkey
Nelson Astur Neto, MD	2011-2012	Instituto Astur São Paulo, Brazil
Vinayak Perake, MD	2012-2013	New York City Health + Hospitals Queens, NY
Rodrigo Góes Medéa de Mendonça, MD	2015-2016	Hospital Santa Casa São Paulo, Brazil
Felipe Augusto Garcez de Campos, MD	2018	Brazil

Okan Aslantürk, MD

Dr. Aslantürk graduated from the Faculty of Medicine of Inonu University in Malatya, Turkey in 2011. He completed his residency in Orthopedics and Traumatology at the Faculty of Medicine of Inonu University in Malatya, Turkey in 2017. Dr. Aslantürk specializes in both pediatric orthopaedics and orthopaedic traumatology (pediatric and adult) and completed a fellowship with the Campbell Clinic in 2024. Dr. Aslantürk is a member of the Turkish Society of Orthopedics and Traumatology, the Turkish Society of Pediatric Orthopaedics, and the AO Trauma Foundation.

Nelson Astur, MD

Dr. Astur received his medical degree from the University of São Paulo (USP) in 2006 and completed his residency in Orthopedics and Traumatology at Santa Casa de São Paulo ‐ Fernandinho Simonsen Pavilion in 2009.

With a specialization in spine surgery, Dr. Astur worked in renowned hospitals such as the Israelita Albert Einstein Hospital and was a Fellow at the University of Tennessee, where he specialized in Pediatric Column and Deformities (Campbell Clinic Orthopedics) and Surgery Minimally Invasive Spine (Semmes‐Murphy Neurologic and Spine Institute) in the years 2011 and 2012.

Dr. Nelson Astur is a member of the Brazilian Society of Orthopedics and Traumatology, Brazilian Society of Spine , American Academy of Orthopedic Surgeons, a member of the Scoliosis Research Society, the North American Spine Society, and the Board of Directors of Brazil's AO Spine chapter.

Rodrigo Góes Medéa de Mendonça, MD

Dr. Góes Medéa de Mendonça graduated in 2008 from the Faculty of Medical Sciences of Santa Casa de São Paulo. He was trained in Orthopedics and Traumatology and Surgery of the Vertebral Column by the "Fernandinho Simomsen Pavilion" ‐ Hospital of the Brotherhood of Santa Casa de Misericórdia de São Paulo. He was a Fellow at the Campbell Clinic at the University of Tennessee Health Science Center in 2015‐2016. He is a member of the Brazilian Society of Orthopedics and Traumatology, the Brazilian Society of Spinal Surgery,the Brazilian Society of Pediatric Orthopedics, and the North American Spine Society.

Recent Publications

Our latest published research includes:

Editorials

Kramer S, Ford L, Walsh J. Neuromonitoring Changes in Spinal Deformity Surgery. Orthop Clin North Am. 2024 Jan;55(1):89-99. doi: 10.1016/j.ocl.2023.07.002. Epub 2023 Aug 10. PMID: 37980106
Pargas-Colina CD. Transient/Toxic Synovitis. Orthop Clin North Am. 2024 Oct;55(4):471-477. doi: 10.1016/j.ocl.2024.04.004. Epub 2024 May 14. PMID: 39216952.
Brown DW, Sheffer BW. Pediatric Septic Arthritis: An Update. Orthop Clin North Am. 2019 Oct;50(4):461-470. doi: 10.1016/j.oc.2019.05.003. Epub 2019 Aug 2. Review. PMID: 31466662
Sheffer BW. Common Techniques Useful to the Practicing or Training Orthopaedic Surgeon on Call in a Pediatric Hospital. COP. 29(3):197-202, May/June 2018. doi: 10.1097/BCO.0000000000000628
Walker K. Top Ten Journal Articles for Residents Beginning a Pediatric Orthopaedic Rotation. COP. 29(3):193-196, May/June 2018. doi: 10.1097/BCO.000000000000062

Journal Publications

Falkner DA, Miller KJ, Emans JB, Thompson GH, Smith JT, Flynn JM, Sawyer JR. How will early onset scoliosis surgery affect my child's future as a young adult? A follow-up study using patient-reported outcome measures. Spine Deform. 2024 Jun 10. doi: 10.1007/s43390-024-00910-2. Epub ahead of print. PMID: 38858335.
Rambo AJ, Sheffer BW, Hajek B, Almatari A, Suit P, Rhodes LN, Cao X, Warner WC, Sawyer JR, Kelly DM, Spence DD. Asymptomatic Lumbar Spondylolysis in the Pediatric Population: A Retrospective CT Review with Radiology Review. Accepted to JAAOS-11/17/23
Holbrook HS, Bowers AF, Mahmoud K, Kelly DM. Weight-Bearing Computed Tomography of the Foot and Ankle in the Pediatric Population. J Pediatr Orthop. 2022 Jul 1;42(6):321-326. doi: 10.1097/BPO.0000000000002168. Epub 2022 Apr 27. PMID: 35475942
Miller KJ, Kelly DM, Sheffer BW. Building a Clinical Skills Program for Orthopaedic Trainees. JPOSNA Special Edition. Vol 4 No S1, Aug 2022.
Rambo A, Rhodes L, Lomax JL, Cao X, Steele J, Romer KR, Spence DD, Sheffer BW, Warner WC, Sawyer JR, Kelly DM. Factors That Influence Acquisition of Lower Extremity Braces in the Pediatric Orthopaedic Population. J Pediatr Orthop. 2022 Jan 1;42(1):40-46. doi.: 10.1097/BPO.0000000000001998. Online ahead of print. PMID: 34723893
Brown DW, Iorio TJ, Mosher ZA, Beaty, JH, Warner WC, Sawyer JR, Spence DD, Sheffer BW, Kelly DM. Intra-observer and Inter-observer Reliability of the Peritubercle Lucency Sign in Slipped Capital Femoral Epiphysis. J Pediatr Orthop. 2021 Mar 1;41(3):159-163. doi: 10.1097/BPO .0000000000001733. PMID: 33332871
Rambo A, McGee TS, Spence DD, Sheffer BW, Kelly DM, Beaty JH. "RAMBO" Lesions: Radiographic Anomalies Missed By Orthopaedists. JPOSNA. Vol 3, No 1: pp. 1-8.(2021):February 2021.
Mauck BM, Kelly DM, Sheffer BW, Rambo A, Calandruccio JH. Gymnast's Wrist. Orthop Cln North Am. 2020 Oct;51(4):394-497. doi: 10.1016/j.ocl.2020.06.012. Epub 2020 Aug 13. PMID: 32950218.
Amoli MA, Sawyer JR, Ellis RT, Seymour J, Spence DD, Kelly DM, Warner WC Jr. Pediatric Patients with Spondylolysis Have High Rates of Vitamin-D Deficiency. J Surg Orthop Adv. 2019 Winter;28(4):257-259. PMID: 31886760
Roaten JD, Kelly DM, Yellin JL, Flynn JM, Cyr M, Garg S, Broom A, Andras LM, Sawyer JR. Pediatric Femoral shaft Fractures: A Multicenter Review of the AAOS Clinical Practice Guidelines Before and After 2009. J Pediatr Orthop. 2019 Sep;39(8):394-399. doi: 10.1097/BPO.0000000000000982. PMID: 31393292.
Pharr ZK, Roaten JD, Moisan A, Kelly DM, Sawyer JR. Use of a Core Reamer for Resection of a Central Distal Femoral Physeal Bone Bridge: A Novel Technique with Three-Year Follow-up. Am J of Orthop (Belle Mead NJ). 2018 May;47(5) doi:10.12788/ajo.2018.0028. PMID: 29883506
Rider CM, Hong V, Westbrooks TJ, Wang J, Sheffer BW, Kelly DM, Spence DD, Sawyer JR. Surgical Treatment of Supracondylar Humeral Fractures in A Freestanding Ambulatory Surgery Center is as Safe as and Faster and More Cost-Effective Thank in A Children's Hospital. J Pediatr Orthop. 2018 Jul;38(6):e343-e348. doi: 10.1097/BPO.0000000000001171. [Epub ahead of print]. PMID: 2966498
Wood, Addison R, DO., PhD., Tebyan A. Rabbani, BS, Benjamin W. Sheffer, MD, Russell A. Wagner, MD, Hugo B. Sanchez, MD, PhD. “Protecting the PCL During Total Knee Arthroplasty Using a Bone Island Technique. The Journal of Arthroplasty. 33(2018) 102-106.
Naranje SM, Erali RA, Sawyer JR, Kelly DM. Football-related Concussion and Lower Extremity Injuries: Have Rule changes in the NFL and NCAA Had Any Effect on Younger Participants? Campbell Orthop J. May 2017; 3:73-76.
Roaten JD, Kelly DM, Yellin JL, Flynn JM, Cyr M, Garg S, Broom A, Andras LM, Sawyer JR. Pediatric Femur Fracture Treatment: A Multicenter Review of the AAOS Clinical Practice Guidelines Before and After 2009. J Pediatr Orthop. 2017 Apr 10. doi: 10.1097/BPO.0000000000000982. [Epub ahead of print. PMID: 28399048.
Naranje SM, Erali RA, Warner WC Jr, Sawyer JR, Kelly DM. Epidemiology of Pediatric Fractures Presenting to Emergency Departments in the United States. J Pediatr Orthop. 2016 Jun; 36(4):e45-8. doi: 10.1097/BPO.0000000000000595. PMID: 26177059.
Naranje, SM, Stewart M, Kelly DM, Spence DD, Sawyer JR, Jones TL, Beaty JH, Warner WC Jr. Changes in the Treatment of Pediatric Femoral Fractures: 15-year trends from United States Kids' Inpatient Database (KID) 1997-2012. J Pediatr Orthop. 2016 Oct-Nov;36(7):e81-85. doi: 10.1097/BPO.0000000000000633. PMID:26327403.
Roaten J, Spence DD. Complications Related to the Treatment of Slipped Capital Femoral Epiphysis. Orthop Clin N Am. 2016 Apr;47(2):405-13. PMID: 26772949.

Original Research

de Mendonça RGM, de Mendonça GHT, Sawyer JR, Kelly DM. Adolescent Idiopathic Scoliosis Treated with Simultaneous Translation on Two Rods (ST2R) Involving Preoperative, Postoperative, and Follow-Up Evaluation by EOS 3D Imaging: A Case Series. Asp Biomed Clin Case Rep. 2024 Aug 22;7(3):233-40.
de mendonca RG, Sawyer JR, Kelly DM. Complications after surgical treatment of adolescent idiopathic scoliosis. Orthop Clin North Am. 2016 Apr;47(2):395-403. PMID: 26772948.
Goes Medea de Mendonca R, Yong Wook Hong V, Flournory JM, Sawyer JR, Kelly DM, Bhattacharya S. Adolescent Idiopathic Scoliosos Treated with Simultaneous Translation on Two Rods (ST2R) with Preoperative, Posteroperative, and Follow-up Evaluation by EOS 3D Imaging: A Pilot Study. Campbell Orthop J. 2016; 2:45-49.
Sawyer JR, de Mendonca GM, Flynn TS, Samdani AF, El-Hawary r, Spurway AJ, Smith JT, Emans MB, St. Hilaire TA, Soufleris SJ, Murphy RP. Complications and Radiographic Outcomes of Posterior Spinal Fusion and Observation in Patients Who Have Undergone Distraction-Based Treatment for Early Onset Scoliosis. Spine Deformity. 2016 Nov;4(6):407-412. doi: 10.1016/j.jspd.2016.08.007. PMID: 27927569.
Lara T, Astur N, Jones TL, Perake V, Moisan A, Warner WC JR, Sawyer JR, Kelly DM. The Risk of Curve Progression and Surgery In African Americans With Adolescent Idiopathic Scoliosis. Spine Deformity. 2017 July;5(4):250-254. PMID: 28622900
Perake VS, Pratell-Mazzzini J, Kelly DM, Sawyer JR, Warner WC, Beaty JH. Bilateral Calcaneonavicular and Talocalcaneal Tarsal Coalitions: Case Report of Two Patients. 2017; 3:69-71.
Rush J, Astur N, Scott S, Kelly DM, Sawyer JR, Warner WC Jr. The Use of Magnetic Resonance Imaging in the Evaluation of Spondylolysis. J Pediatr Orthop, April/May 2015; 35(3):271-275. PMID: 24978120.

Review Articles

Warner WC Jr, de Mendonca RGM. Adolescent Spondylolysis: Management and Return to Play. Instr Course Lect. 2017 Feb 15;66:409-413. PMID: 28594517
Kelly DM, Mahmoud K, Mauck BM. Polydactyly of the Foot: A Review. J Am Acad Orthop Surg. 2021 May1;39(9):361-369. Online ahead of print. PMID: 33443388
Sheffer BW, Kelly DM, Rhodes LN, Sawyer JR. Perioperative Pain Management in Pediatric Spine Surgery. Orthop Clin North Am. 2017 Oct;48(4):481-486. doi: 10.1016/j.ocl.2017.06.004. Epub 2017 Jul 15. Review. PMID: 28870307.
Amoli MA, Flynn JM, Edmonds EW, Glotzbecker MP, Kelly DM, Sawyer JR. Gender Differences in Pediatric Orthopaedics: What Are the Implications for the Future Workforce? Clin Orthop Relat Res. 2016 Sep;474(9):1973-8. doi: 10/1007/s11999-016-4984-z. PMID: 27422391.

Podium Presentations

Campos FAG, Fernandez-Pineda I, Interiano RB, Ness KK, Davidoff A, Hudson M, Robison LL, Kelly DM, Sawyer JR, Warner WC Jr. Spinal Deformity in Long-Term Survivors of Childhood Sarcoma. 54th Annual SRS. Sept 18-21, 2019. Montreal
Sawyer JR & de Mendonca R. Complications & radiographic outcomes of posterior spinal fusion (PSF) & observation in patients who have undergone distraction-based treatment for early onset scoliosis. POSNA, Indianapolis, April 27-30, 2016.
Astur NA, Lara T, Perake V, Warner WC, Kelly DM, Sawyer JR. The Risk of Curve Progression and Surgery in African American Patients with Adolescent Idiopathic Scoliosis. Western Orthop Assoc Annual Mtg. Aug. 2-5, 2017, Kauai, HI.
Carveth S, Cassidy J, Crepeau A, Ellington M, Flakne J, Kelly DM, Kramer S, Miller K, Nowicki P, Rowland J, Sawyer JR. In Situ Screw Fixation for Stable Slipped Capital Femoral Epiphysis is Safety Treated in Both Inpatient and Outpatient Settings. AAOS. Feb. 12-16, 2024. San Francisco
Holbrook HS, Bowers AF, Mahmoud K, Kelly DM, Sheffer BW. Weight-Bearing Computed Tomography of the Foot and Ankle in the Pediatric Population. EPOS. April 6-9, 2022. Copenhagen
Miller K, Kelly DM, Sawyer JR. What Does Adulthood Look Like for Early Onset Scoliosis Patients? Long-term Follow-Up on Patient Reported Outcome Measures. POSNA Subspecialty Day, May 11-14, 2022, Vancouver BC.
Campos FAG, Fernandez-Pineda I, Interiano RB, Ness KK, Davidoff A, Hudson M, Robison LL, Kelly DM, Sawyer JR, Warner WC Jr. Spinal Deformity in Long-Term Survivors of Childhood Sarcoma. 54th Annual SRS. Sept 18-21, 2019. Montreal
Roaten, Sawyer JR. Pediatric Femur Fracture Treatment: A Multicenter Review of the Pre and Post 2009 AAOS Clinical Practice Guidelines. 35th EPOS, Rome, 2016.
Roaten, Sawyer JR. Pediatric Femur Fracture Treatment: A Multicenter Review of the Pre and Post 2009 AAOS Clinical Practice Guidelines. AAOS, Orlando, 2016.
Sawyer JR, Amoli M, Ellis T, Spence DD, Kelly DM, Warner WC Jr. Pediatric Patients with Spondylolysis Have High Rates of Vitamin-D Deficiency. IMAST, Washington, D.C., July 13-16, 2016.
Sawyer JR, Roaten, CHOP, UCLA, Cincinnati. Pulseless supracondylar humerus fractures with nerve injury-an absolute indication for open reduction? 2016 POSNA, Indianapolis, 4/27-4/30/16.
Sawyer JR, Roaten, CHOP, UCLA. Pediatric Femur Fracture Treatment-A Multicenter Review of the Pre & Post 2009 AAOS Clinical Practice Guidelines. POSNA, Indianapolis, April 27-30, 2016.
Roaten JD, Moisan A, Sawyer JR, et al. Pediatric Femur Fracture Management: A Multicenter Analysis of the Trends Pre & Post 2009 AAOS Clinical Practice Guidelines. 2015 AAOS, Las Vegas, NV.

Posters

Rambo A, Hajek B, Almatari A, Suit P, Rhodes L, Cao X, Sawyer JR, Kelly DM, Sheffer BW, Spence DD, Warner WC. Asymptomatic Lumbar Spondylolysis in the Pediatric Population: Analysis of CT Scans. POSNA. April 25-28, 2023, Nashville
Henderson L, Kink R, Longjohn M, Greeley A, Sheffer BW, Sawyer JR, Kelly DM. The Relationship Between Proper Restraint Type and Long Bone Fractures in Children Involved in Motor Vehicle Collisions.2018 EPOS, (4/11-4/14), Oslo
Sawyer JR, Hartline JT, Kelly DM, Beaty JH, Sheffer BW, Spence DD. Operating Room (OR) Personnel Factors Determine Efficiency For Pediatric Spinal Fusions for Scoliosis: Does the Surgeon Influence This? Le Bonheur Research Day, March 28, 2018
Villarreal ED, Sheffer B, Kelly DM. Rate of Concurrent Tibial Shaft and Distal Tibia Fractures in Pediatric Patients. Le Bonheur Research Day, Memphis, March 29, 2017.
Sawyer JR, Amoli A, Kelly DM. Do males & females get different jobs within pediatric orthopedics? A comparison from the POSNA needs assessment survey. 2016 POSNA, Indianapolis.
Sawyer JR, Amoli A, Kelly DM. Do males & females get different jobs within pediatric orthopedics? A comparison from the POSNA needs assessment survey. EPOS, Rome, 2016.
Sawyer JR, Roaten JD, CHOP, UCLA, CO. A 10-Year Multi-Center Review of Current Trends in the Treatment of Pediatric Femoral Shaft Fracture. EPOS, April 15-18, 2015; France.

*updated October 2024

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