Biomechanics Research

• 

  Aarti Shenoy, PhD

  Post Doctoral Fellow

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202-A
  New York, NY 10021

  Tel: 646.714.6431
  Email: shenoya@hss.edu

  About Aarti Shenoy

  Dr. Aarti Shenoy joined the Biomechanics department at HSS as a Postdoctoral Fellow in February 2021. Dr. Shenoy is interested in implant and modular junction corrosion and its impact on implant longevity. She has investigated corrosion behavior in hip implants, particularly modular dual mobility designs, using in vitro test methods and retrieval analysis studies in collaboration with the Arthroplasty service. Her research will continue to focus on material science aspects within orthopedic devices: structure-property-processing interactions and their effects on clinical outcomes. Dr. Shenoy is interested in biomedical alloys, their microstructures and how alloy microstructure might affect mechanical properties of the material and the device as well as device performance.

  Dr. Shenoy received her PhD in Bioengineering from Clemson University as part of Dr. Jeremy Gilbert’s research group. Her research was focused on test method development to evaluate hip implant mechanical and electrochemical performance, retrieval analysis using microscopy techniques, and studying macrophage-tribocorrosion interactions in vitro. She was a technology transfer and commercialization intern at the Clemson University Research Foundation (CURF) where she acted as a liaison between faculty members developing IP and the tech transfer team, and also developed marketing materials for existing Clemson IP.

  Dr. Shenoy also holds a Bachelor of Engineering in Biomedical Engineering from University of Mumbai, India and a Master of Science in Bioengineering from Syracuse University, NY

  Awards

  New Investigator Recognition Award (NIRA) finalist, 2023

  Selected Publications

  • C. Kahlenberg, E. Baral, A.A. Shenoy, “Clinical and Biomechanical Characteristics of Posterior-Stabilized Polyethylene Post Fractures in Total Knee Arthroplasty: A Retrieval Analysis”, Journal of Arthroplasty, Feb 2023
  • A.A. Shenoy, S.M. Kurtz, J.L. Gilbert, “Non-Tribological Corrosion Modes Dominate Wrought CoCrMo Acetabular Taper Corrosion: A Retrieval Study”, Journal of Biomedical Materials Research Part-B, May 2021 (DOI: 10.1002/jbm.b.34854)
  • M. Wiegand, A.A. Shenoy et al., “Sensing Localized Surface Corrosion Damage of CoCrMo Alloys and Modular Tapers of Total Hip Retrievals Using Nearfield Electrochemical Impedance Spectroscopy”, ACS Biomaterials Science and Engineering, Jan 2020 (DOI: 10.1021/acsbiomaterials.9b00945)
  • A.A. Shenoy, J.L. Gilbert, “In vitro test methods for seating and fretting corrosion behavior of modular metal-on-metal acetabular tapers”, Journal of Orthopaedic Research, Dec 2019 (DOI: 10.1002/jor.24554)
  • E.S. Ouellette, A.A. Shenoy (co-first-author), J.L. Gilbert, “The seating mechanics of head-neck modular tapers in vitro: Load-displacement measurements, moisture, and rate effects”, Journal of Orthopaedic Research, Sept 2018 (DOI: 10.1002/jor.23725)

  For more publications, please see the PubMed listing.

  Selected Presentations

  • A.A. Shenoy, A. Pekmezian, T. Wright, D.E. Padgett, “Corrosion in Modular Dual Mobility Acetabular Components: A Retrieval Analysis Study”, Orthopaedic Research Society Annual Meeting 2023, Dallas TX, USA (Finalist for New Investigator Recognition Award)
  • A.A. Shenoy, J. Steele, D.E. Padgett, T.M. Wright, “How do surface finish and taper design influence corrosion modes and mechanically assisted crevice corrosion behavior in modular dual mobility acetabular tapers?”, International Society for Technology in Arthroplasty Annual Meeting 2022, Maui HI, USA (Talk)
  • A.A. Shenoy, C Kahlenberg, et al., “Post Fractures in Total Knee Arthroplasty: Differences in Fracture Progression between UHMWPE and XLPE Posts”, International Society for Technology in Arthroplasty Annual Meeting 2022, Maui HI, USA (Talk)
  • A.A. Shenoy, J.L. Gilbert, “In Vivo Corrosion of Acetabular Modular Tapers Reduces Local Corrosion Resistance: Near-field Electrochemical Impedance Spectroscopy as an Indicator of the Type and Severity of Corrosion in Retrieved Hip Implants”, Exciting Research in Orthopaedic Implants and How to Get it Funded, Orthopaedic Research Society Implants RIG Section Virtual Session, 2021, (Early-stage career investigators invited talk)
  • A.A. Shenoy, J.L. Gilbert, “Near-Field Electrochemical Impedance Spectroscopy Methods for Retrieval Surface Analysis”, International Society for Technology in Arthroplasty Annual Meeting 2019, Toronto, Canada (Talk)
  • A.A. Shenoy, S.M. Kurtz, J.L. Gilbert, “Biological, Chemical and Mechanical Damage Modes in Corrosion of CoCrMo Acetabular Liners”, International Society for Technology in Arthroplasty Annual Meeting 2018, London, UK (Young Investigators Session, Talk)
  • J.L. Gilbert, A.A. Shenoy, “Bio-metallurgical interactions during in vivo corrosion: Beyond fretting corrosion, a study of the forms of corrosion in retrieved modular implants, their causes and consequences”, ASTM Symposium 2017, Toronto, Canada
• 

  David Shamritsky, MEng

  Research Engineer

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202-A
  New York, NY 10021

  Tel: 212-774-7247
  Email: shamritskyd@hss.edu

  About David Shamritsky

  David’s work in the Biomechanics Department focuses on a clinical research device that measures structural stability of a patient’s knee in response to specific directions of loading. Outputs from this device are being used to aid in diagnosis of soft tissue injuries, evaluate the effectiveness of surgical treatments, and compare post-operative results to intra-operative decision-making. This project is highly collaborative with clinicians and researchers in the Sports Medicine Institute and Adult Reconstruction & Joint Replacement (ARJR) services.

  Prior to joining HSS, David received his undergraduate and master’s degrees in Biomedical Engineering from Cornell University. At Cornell, he performed research in Dr. Christopher Hernandez’s lab developing an in-vivo fatigue loading model for the knee to study bone marrow lesions and osteoarthritis. His graduate design project was in partnership with ENT clinicians at Weill Cornell Medicine and in Zimbabwe to design and prototype a medical device that met the needs of their country’s hospital network.

  Education

  Cornell University, B.S. 2021
  Cornell University, M. Eng. 2021

• 

  Elexis (Baral) Padgett, MS

  Research Engineer III

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202-A
  New York, NY 10021

  Tel: 646.797.8904
  Email: barale@hss.edu

  About Elexis (Baral) Padgett

  Elexis joined the department in September of 2013 as the lab technician. Since then, she has moved up the ladder to a Research Engineer III and directly manages the entire implant retrieval system as well as many of the projects which stem from this field of research. Her main areas of focus are implant failure analysis, material degradation, and translational aspects of implant design that may impact patient outcomes or correlate with patient demographics.

  While at HSS, the hospital funded her further education for her Masters Degree which she completed in 2022 at City College of New York in their Biomedical Engineering department. Her thesis was a mouse model focused on bone healing post total knee arthroplasty for patients who suffer from Glucocorticoid Induced Osteoarthritis (GIOP). She has always been interested in Orthopaedics since her undergraduate education at Rensselaer Polytechnic Institute. While at HSS, Elexis has helped raise awareness in the STEM field by helping programs like the Perry Initiative which introduce female high school students to careers in orthopaedics. Elexis is a member of the Orthopaedic Research Society (ORS), International Society for Technology in Arthroplasty (ISTA) and the American Academy of Orthopaedic Surgeons (AAOS). 

  Research

  • Implant Failure Analysis 
  • Implant Longevity
  • Material Science 
  • Bone Healing and Adaptation 

  Selected Publications

  Kahlenberg, Cynthia, et al. "Clinical and Biomechanical Characteristics of Posterior-Stabilized Polyethylene Post Fractures in Total Knee Arthroplasty: A Retrieval Analysis." The Journal of Arthroplasty (2023).

  Chen, James B., et al. "A Postmortem Analysis of Polyethylene Damage and Periprosthetic Tissue in Rotating Platform and Fixed Bearing Tibial Inserts." The Journal of Arthroplasty 37.6 (2022): 1203-1209.

  Kahlenberg, Cynthia A., et al. "Retrieval analysis of polyethylene components in rotating Hinge knee arthroplasty implants." The Journal of Arthroplasty 36.8 (2021): 2998-3003.

  Baral, Elexis C., et al. "Porous coatings in retrieved acetabular components." The Journal of Arthroplasty 35.8 (2020): 2254-2258.

  For more publications, please see the PubMed listing.

• 

  Jonathan Glenday

  Post Doctoral Fellow

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202
  New York, NY 10021

  Tel: 646.797.8532
  Email: GlendayJ@hss.edu

  About Jonathan Glenday

  Jonathan Glenday joined Hospital for Special Surgery in March 2020 as a Postdoctoral Fellow to work in collaboration with the Adult Reconstruction and Joint Replacement Service. His research aims to improve implant longevity by understanding how total knee arthroplasty (TKA) surgical choices effect bone-implant interaction. Alongside his team members in the Department of Biomechanics, he has developed a computational workflow that connects musculoskeletal models with finite element models to quantify the effect of component alignment and design on the stability and fixation of TKA. 

  Jonathan obtained both his undergraduate degree in Electromechanical Engineering and his doctoral degree in Biomedical Engineering from the University of Cape Town in South Africa. His doctoral research, which was conducted in collaboration with the Motion Analysis Laboratory at Hospital for Special Surgery, utilized computational modelling to optimize prosthesis alignment for reverse total shoulder arthroplasty. Jonathan completed his doctoral degree in 2018 and, in 2019, he worked as a Postdoctoral Researcher at the University of Tübingen in Germany. During his time there, he developed a musculoskeletal model of the wrist to assess the risk factors associated with carpal tunnel syndrome.

  Education

  2014 – 2018: PhD in Biomedical Engineering – University of Cape Town, South Africa. 
  2010 – 2013: BSc(Eng) in Electromechanical Engineering - University of Cape Town, South Africa.
  Awards
  2020:  Best presentation in computational modeling for arthroplasty – 1st ISTA New Early-career Webinar Series.
  2018: Best shoulder presentation – 64th South African Orthopaedic Congress.

  Selected Publications

  Dey, R., Glenday, J., du Plessis, J., Sivarasu, S., and Roche, S. (2023). Characterising moment arms of the coracobrachialis and short head of biceps for healthy and reverse total shoulder arthroplasty during elevation and rotation: a modelling study. Journal of Shoulder and Elbow Surgery. DOI: https://doi.org/10.1016/j.jse.2023.01.015.

  Glenday, J., Kontaxis, A., Roche, S., and Sivarasu, S. (2021). Development of a framework to assess the biomechanical impact of reverse shoulder arthroplasty placement modifications. Journal of Orthopaedic Research. DOI: https://doi.org/10.1002/jor.25238.

  Glenday, J., Wright, T., Lipman, J., Sculco, P., Mayman, D., Vigdorchik, J., and Quevedo-Gonzalez, F. (2021). Effect of varus alignment on the bone-implant interaction of a cementless tibial baseplate during gait. Journal of Orthopaedic Research. DOI: https://doi.org/10.1002/jor.25129.

  Glenday, J., Steinhilber B., Jung F., and Haeufle, D.F.B. (2020). Development of a musculoskeletal model of the wrist to predict frictional work dissipated due to tendon gliding resistance in the carpal tunnel. Computer Methods in Biomechanics and Biomedical Engineering. DOI: https://doi.org/10.1080/10255842.2020.1862094.

  Glenday, J., Kontaxis, A., Roche, S., and Sivarasu, S. (2019). Effect of humeral tray placement on impingement-free range of motion and muscle moment arms in reverse shoulder arthroplasty. Clinical Biomechanics. 62, 136-143. DOI: https://doi.org/10.1016/j.clinbiomech.2019.02.002.

  For more publications, please see the PubMed listing.

  Selected Presentations

  Glenday, J., Sculco, P., Vigdorchik, J., Lipman, J., Kahlenberg, C., Mayman, D., Wright, T., and Quevedo-Gonzalez, F. Tibial baseplate motion relates to tibiofemoral kinematics during gait: a holistic evaluation of TKA biomechanics using a patient-specific computational workflow. 33rd International Society for Technology in Arthroplasty Congress. (09/2022). 

  Glenday, J., Sculco, P., Vigdorchik, J., Lipman, J., Wright, T., and Quevedo-Gonzalez, F. The initial fixation of cementless total knee arthroplasty is associated with the anterior-posterior translation during gait: a computational study. 2022 Annual Meeting of the American Academy of Orthopaedic Surgeons. (03/2022).​​​​

  Glenday, J., Wright, T., Lipman, J. Sculco, P., Mayman, D., Vigdorchik, J., and Quevedo-Gonzalez, F. Effect of varus alignment on the bone-implant interaction of cementless tibial baseplates. 1st New Early-career Webinar Series – International Society for Technology in Arthroplasty. (11/2020).

  Glenday, J., Kontaxis, A., Roche, S., and Sivarasu, S. Optimisation of reverse shoulder arthroplasty through the combination of prosthesis placement modifications. XXVII Congress of the International Society of Biomechanics. (08/2019).

• 

  Joseph Lipman, MS

  Director of Device Development, Biomechanics

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202-H
  New York, NY 10021

  TEL: 212.606.1420
  Email: lipmanj@hss.edu

  After receiving and undergraduate and master’s degree in mechanical engineering from Tufts University, Mr. Lipman joined the Biomechanics Department as a Design Engineer.

  He has over 33 years of medical research and device development experience and has been the Director of Device Development since 2000.  He has worked with multiple services at HSS including Adult Hip and Knee Replacement, Foot and Ankle, Hand and Upper Extremity, Hip Preservation, Spine and Sports Medicine.  In working with these services and the Biomechanics department, he’s contributed to the development of implants for the knee, hip, elbow, wrist and spine. These implants have been licensed to several orthopaedic companies and are sold worldwide. He is a named inventor on twenty-six US patents and has multiple publications in the medical device area. In addition, he is a registered US Patent Agent.

  He is the recipient of the 2019 AAOS Orthopaedic Video Theater Award – Adult Reconstruction Hip, the 2011 AOSSM Excellence in Research Award and the 1998 ASB Clinical Biomechanics Award. He is a reviewer for JOR, CORR, JBJS, Scientific Reports and the HSS journal. 

  Selected Publications

  Scifert CF, Brown TD, Lipman JD. Finite element analysis of a novel design approach to resisting total hip dislocation. Clin Biomech (Bristol, Avon). 1999 Dec;14(10):697-703.

  Maher SA, Lipman JD, Curley LJ, Gilchrist M, Wright TM. Mechanical performance of ceramic acetabular liners under impact conditions. J Arthroplasty. 2003 Oct;18(7):936-41.

  Huang RC, Wright TM, Panjabi MM, Lipman JD. Biomechanics of nonfusion implants. Orthop Clin North Am. 2005 Jul;36(3):271-80.

  Holley KG, Furman BD, Babalola OM, Lipman JD, Padgett DE, Wright TM. Impingement of acetabular cups in a hip simulator: Comparison of highly cross-linked and conventional polyethylene. J Arthroplasty. 2005 Oct;20(7 Suppl 3):77-86.

  Maher SA, Lipman JD. Influence of acetabular rim profile on hip dislocation. Proceedings of the I MECH E Part H Journal of Engineering in Medicine. 2006;220(8):881-6.

  For more publications, please see the PubMed listing.

  Recent Presentations

  Lipman JD, Padgett DE, Robie BH. How total hip component design influences range of motion and dislocation rate. Trans Orthop Res Soc. 1998:830.

  Furman BD, Holley K, Babalola OM, Lipman JD, Haywood AM, Padgett DE, et al. Acetabular component impingement increases wear and damage of elevated crosslinked and conventional UHMWPE. Trans Orthop Res Soc. 2004:7-10.

  Gortner MR, Lipman JD, Wright TM, Bartel DL. Finite element analysis of anterior post impingement on posterior stabilizing total knee prostheses. Trans Orthop Res Soc. 2006.

• 

  Reza Pourmodheji

  Post Doctoral Fellow

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202-A
  New York, NY 10021

  Tel: 212.774.7275
  Email: pourmodhejir@hss.edu

  About Reza Pourmodheji

  Reza joined the Biomechanics Department at HSS in February 2022. The focus of his research is knee biomechanics where he integrates robotic experimental tools and physics-based computational approaches from cadaveric and patient-specific measurements to answer the research questions for orthopedic care improvement. He works closely with Adult Reconstruction and Joint Replacement, Sport Medicine and Radiology and Imaging Services at HSS.

  Reza obtained his PhD in Mechanical Engineering from the City University of New York where he currently serves as Adjunct Assistant Professor lecturing mechanical engineering courses. Prior to HSS, he was research associate at Michigan State University working on mathematical modeling and mechanobiology in progression of cardiovascular diseases.

  Appointments

  Postdoctoral Fellow, Department of Biomechanics, Hospital for Special Surgery
  Adjunct Assistant Professor, The City University of New York

  Education

  Ph.D. – Mechanical Engineering, The City University of New York, New York, NY – 2018
  M.Sc. – Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran – 2012
  B.Sc. – Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran – 2008

  Awards

  NIH Travel Award, IMAG-MSM 2020, Bethesda, MD
  Arthur Goldstein Award for outstanding teach in Mechanical Engineering, The City University of New York, 2019

• 

  Ryan Helbock, MS

  Design Engineer

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202-A
  New York, NY 10021

  Tel: 212.774.2228
  Email: helbockr@hss.edu

  About Ryan Helbock

  Ryan Helbock joined HSS in 2022 as a Design Engineer in the Device Development group, where he works on patient-specific preoperative planning and custom implant design for complex joint arthroplasty. He is also involved in computational research studying how implant design and bone quality can contribute to early failure of total hip replacements. 

  Prior to joining HSS, Ryan received his BE and MS degrees in Biomedical Engineering at Stony Brook University in 2020 and 2022, respectively. During his graduate studies, he conducted research on cardiovascular implants and designed a novel transcatheter aortic valve replacement via patient-specific computational modeling. His interest in solving complex problems involving the human body is what drew him to the multifaceted and bustling Biomechanics Department at HSS

  Education

  2022, Master of Science in biomedical engineering, Stony Brook University
  2020, Bachelor of Engineering in biomedical engineering, Stony Brook University

  Selected Publications

  • Helbock RT, Anam SB, Kovarovic BJ, Slepian MJ, Hamdan A, Haj-Ali R, Bluestein D. Designing a Novel Asymmetric Transcatheter Aortic Valve for Stenotic Bicuspid Aortic Valves Using Patient-Specific Computational Modeling. Ann Biomed Eng. 2023 Jan;51(1):58-70. doi: 10.1007/s10439-022-03039-3. Epub 2022 Aug 30. PMID: 36042099.
  • Kovarovic B, Helbock R, Baylous K, Rotman OM, Slepian MJ, Bluestein D. Visions of TAVR Future: Development and Optimization of a Second Generation Novel Polymeric TAVR. J Biomech Eng. 2022 Jun 1;144(6):061008. doi: 10.1115/1.4054149. PMID: 35318480; PMCID: PMC8990719.

  For more publications, please see the PubMed listing.

Engineering Team

• 

  Brett D. Steineman

  Assistant Professor

  Dr. Brett D. Steineman is an Assistant Professor of Applied Biomechanics in Orthopaedic Surgery at HSS and the Weill Cornell Medical College. Dr. Steineman specializes in combining dynamic cadaveric experimentation with computational models to address clinically relevant questions associated with total ankle arthroplasty, progressive collapsing foot deformity, and other challenges related to the lower extremities. He is currently focused on developing cadaver models to optimize the fixation geometry of total ankle replacements to minimize micromotion and to study the effects of various surgical treatments for progressive collapsing foot deformity to avoid overcorrection.

  Dr. Steineman received his B.S. in mechanical engineering from Trine University and Ph.D. in bioengineering from Colorado State University. As an undergraduate student, Brett also worked as a product development engineering co-op at Zimmer-Biomet, Inc. in Warsaw, Indiana helping to develop surgical instruments and implants for partial knee replacement, total knee replacement, and knee-specific limb salvage procedures. As a graduate student, Brett was advised by Dr. Tammy Haut Donahue and Dr. Robert LaPrade on his dissertation research focused on soft tissue mechanics and improving meniscal root repairs. The goal of his research was to better understand root tears of the anterior meniscal insertions and to investigate mechanistic causes of insufficient meniscal root repairs. After receiving his Ph.D., Brett joined the Biomechanics Department as a postdoctoral fellow in foot & ankle research.

  Dr. Steineman is a member of the Orthopaedic Research Society, the American Society of Mechanical Engineers, and the Society of Catholic Scientists, an associate member of the American Orthopaedic Foot & Ankle Society, and an allied associate member of the American Academy of Orthopaedic Surgeons. He also contributes as a reviewer for grant study sections (e.g., Orthopaedic Research & Education Foundation), peer-reviewed journals (e.g., Journal of Biomechanics, Journal of Orthopaedic Research), and annual conference Meetings (e.g., Summer Biomechanics Bioengineering Biotransport Conference, Annual Meeting of the Orthopaedic Research Society).

  Appointments

  Assistant Professor of Applied Biomechanics in Orthopaedic Surgery, Weill Cornell Medicine, 2023

  Education

  Postdoc, Hospital for Special Surgery, 2021
  Ph.D. in Bioengineering, Colorado State University, 2018
  B.S. in Mechanical Engineering, Trine University, 2014

  Awards

  New Investigator Recognition Award Recipient – Orthopaedic Research Society – 2023
  J. Leonard Goldner Award Recipient – American Orthopaedic Foot & Ankle Society – 2022

  Selected Publications

  Henry JK, Hoffman J, Kim J, Steineman B, Sturnick D, Demetracopoulos C, Deland J, Ellis S. The Foot and Ankle Kinematics of a Simulated Progressive Collapsing Foot Deformity During Stance Phase: A Cadaveric Study. Foot Ankle Int. 2022 Dec;43(12):1577-1586. doi: 10.1177/10711007221126736. Epub 2022 Oct 19. PubMed PMID: 36259688.

  Steineman BD, Quevedo González FJ, Sturnick DR, Deland JT, Demetracopoulos CA, Wright TM. Biomechanical evaluation of total ankle arthroplasty. Part I: Joint loads during simulated level walking. J Orthop Res. 2021 Jan;39(1):94-102. doi: 10.1002/jor.24902. Epub 2020 Nov 11. PubMed PMID: 33146417; PubMed Central PMCID: PMC7749051.

  Quevedo González FJ, Steineman BD, Sturnick DR, Deland JT, Demetracopoulos CA, Wright TM. Biomechanical evaluation of total ankle arthroplasty. Part II: Influence of loading and fixation design on tibial bone-implant interaction. J Orthop Res. 2021 Jan;39(1):103-111. doi: 10.1002/jor.24876. Epub 2020 Oct 20. PubMed PMID: 33030768; PubMed Central PMCID: PMC7748995.

  Steineman BD, LaPrade RF, Haut Donahue TL. Loosening of Transtibial Pullout Meniscal Root Repairs due to Simulated Rehabilitation Is Unrecoverable: A Biomechanical Study. Arthroscopy. 2019 Apr;35(4):1232-1239. doi: 10.1016/j.arthro.2018.11.041. Epub 2019 Mar 11. PubMed PMID: 30871905.

  Steineman BD, LaPrade RF, Haut Donahue TL. Loosening of Posteromedial Meniscal Root Repairs Affects Knee Mechanics: A Finite Element Study. J Biomech Eng. 2022 May 1;144(5). doi: 10.1115/1.4053100. PubMed PMID: 34817052.

  For more publications, please see the PubMed listing.

• 

  Jeff Hoffman, MS

  Research Engineer

  Department of Biomechanics
  AMT Center
  510 East 73rd Street, Room 202
  New York, NY 10021

  Tel: 212.774.2995
  Email: hoffmanj@hss.edu

  About Jeff Hoffman

  Jeff Hoffman began at HSS as a research engineer in the biomechanics department in March 2019. As a research engineer, he leads testing exploring the biomechanics of the foot and ankle using a validated 6-degree of freedom robotic gait simulator. Currently, he is examining the effect of surgical interventions on a validated model of progressive collapsing foot deformity during walking. Additionally, he is working with clinical staff to evaluate the effect of tibial implant design on early stage micromotion after total ankle arthroplasty. Previously, Jeff has worked on biomechanical projects aimed at addressing common pathologies of the foot and ankle, such as Jones’ fracture and Lisfranc injuries.

  In addition to foot and ankle work, Jeff is involved in uniaxial mechanical testing for various projects around the lab. 

  Prior to HSS, Jeff received his M.S. in Biomedical Engineering from Drexel University in 2018. During his time at Drexel, he worked in collaboration with the motion laboratory at Shriners Hospital for Children in Philadelphia to evaluate the changes in pediatric spinal motion with age in healthy and scoliotic patients. Jeff received a BS in Biomedical Engineering from the University of Delaware in 2016. During his time at UD, Jeff worked as an undergraduate research assistant to evaluate the effect of functional electrical stimulation during gait in pediatric patients with cerebral palsy. 

  Education

  BS – University of Delaware, 2016
  MS – Drexel University, 2018

  Awards

  J Leonard Goldner Award, AOFAS Annual Meeting, 2022

  Selected Publications

  • Hoffman JW, Bitar RC, Williams N, Steineman BD, Sturnick DR, Garrison GW, Demetracopoulos CA, Drakos MC, O'Malley MJ. Orthosis and Foot Structure Affect the Fifth Metatarsal Principal Strains During Simulated Level Walking. Am J Sports Med. 2022 May;50(6):1659-1667. doi: 10.1177/03635465221079652. Epub 2022 Mar 18. PMID: 35302902.
  • Kim J, Hoffman J, Steineman B, Eble SK, Roberts LE, Ellis SJ, Drakos MC. Kinematic Analysis of Sequential Partial-Midfoot Arthrodesis in Simulated Gait Cadaver Model. Foot Ankle Int. 2022 Dec;43(12):1587-1594. doi: 10.1177/10711007221125226. Epub 2022 Oct 14. PMID: 36239404.
  • Henry JK, Hoffman J, Kim J, Steineman B, Sturnick D, Demetracopoulos C, Deland J, Ellis S. The Foot and Ankle Kinematics of a Simulated Progressive Collapsing Foot Deformity During Stance Phase: A Cadaveric Study. Foot Ankle Int. 2022 Dec;43(12):1577-1586. doi: 10.1177/10711007221126736. Epub 2022 Oct 19. PMID: 36259688.
  • Kim J, Hoffman JW, Ellis SJ, Deland JT, Steineman BD. 2022 J. Leonard Goldner Award Winner: Passive Eversion Assessment for Progressive Collapsing Foot Deformity after Lateral Column Lengthening: A Cadaveric Biomechanical Study. Foot & Ankle Orthopaedics. 2022;7(4). doi:10.1177/2473011421S00724