Stephen R. Chen

ORCID: 0000-0001-7000-9842
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About
Contact & Profiles
Research Areas
  • Spine and Intervertebral Disc Pathology
  • Musculoskeletal pain and rehabilitation
  • Spinal Fractures and Fixation Techniques
  • Bone fractures and treatments
  • Orthopedic Surgery and Rehabilitation
  • Trauma Management and Diagnosis
  • Cardiac, Anesthesia and Surgical Outcomes
  • Shoulder Injury and Treatment
  • Shoulder and Clavicle Injuries
  • Orthopaedic implants and arthroplasty
  • Elbow and Forearm Trauma Treatment
  • Hip and Femur Fractures
  • Health and Medical Research Impacts
  • Hip disorders and treatments
  • Tendon Structure and Treatment
  • Orthopedic Infections and Treatments
  • Cervical and Thoracic Myelopathy
  • Facial Nerve Paralysis Treatment and Research
  • Spondyloarthritis Studies and Treatments
  • Pelvic and Acetabular Injuries
  • Pain Mechanisms and Treatments
  • Clinical practice guidelines implementation
  • Immune Cell Function and Interaction
  • Pharmaceutical industry and healthcare
  • Medical Imaging and Analysis

York University
2025

University of Pittsburgh Medical Center
2022-2024

University of Pittsburgh
2021-2024

Greater Pittsburgh Orthopaedic Associates
2024

Bethel University
2024

University of California, San Diego
1999

University of Hawaii System
1999

Total hip replacement (THR) is one of the most common elective orthopaedic surgeries performed, with increasing demand among younger individuals. Few evidence-based guidelines exist on safe activity participation following THR, including whether high-intensity sport for The purpose this study was to identify if increased intensity physical THR associated activity-related pain and revision rates. Two groups undergoing were recruited: preoperative (cohort 1) 5-7 years postsurgery 2); both...

10.1136/bjsports-2024-109237 article EN British Journal of Sports Medicine 2025-03-07

Prospective cohort.Determine if total hip arthroplasty (THA) changes lumbar spine kinematics during gait in a manner that explains the improvements back pain seen patients with hip-spine syndrome.For syndrome, both and have been demonstrated after THA; however, exact mechanism of improvement remains unknown, as no corresponding static radiographic parameters identified.Thirteen severe, unilateral osteoarthritis scheduled to undergo THA concomitant disability were tested at baseline 6 months...

10.1097/brs.0000000000004677 article EN Spine 2023-04-13

Lisfranc injuries are a disruption of one or more the tarsometatarsal joints and have an estimated incidence 1/55 000 people. However, total number could be underreported, because almost 20% these initially missed. Because relative infrequency injuries, current literature is inconsistent in regard to proper treatment. This article provides review complex including relevant anatomy, diagnosis, treatment, classifications, operative approaches, outcomes complications. Based on existing...

10.1177/2473011420982275 article EN cc-by-nc Foot & Ankle Orthopaedics 2021-01-01

Abstract Background Previous animal models of intervertebral disc degeneration (IDD) rely on open surgical approaches, which confound the degenerative response and pain behaviors due to injury surrounding tissues during approach. To overcome these challenges, we developed a minimally invasive percutaneous puncture procedure induce IDD in rat model. Methods Ten Fischer 344 male rats underwent annular lumbar discs (IVDs) at L2‐3, L3‐4, L4‐5. unpunctured were used as controls. Magnetic...

10.1002/jsp2.1202 article EN JOR Spine 2022-05-13

Retrospective review of prospectively collected cohort.To identify differences in treatment and mortality spine fractures patients with ankylosing conditions the spine.Ankylosing spondylitis (AS) diffuse idiopathic skeletal hyperostosis (DISH) are two most common etiologies spinal disorder (ASD). However, studies on outcomes AS DISH remain few.Patients presenting a fracture were diagnosed or at single tertiary care center between 2010 2019. We excluded those who lacked cross-sectional...

10.31616/asj.2022.0155 article EN cc-by-nc Asian Spine Journal 2023-02-13

OBJECTIVE Currently there is no standardized mechanism to describe or compare complications in adult spine surgery. Thus, the purpose of present study was modify and validate Clavien-Dindo-Sink complication classification system for applications METHODS The evaluated modified surgery by four fellowship-trained surgeons using a consensus process. A distinct group three completed randomized electronic survey grading 71 real-life clinical case scenarios. repeated 2 weeks after its initial...

10.3171/2023.11.spine23396 article EN Journal of Neurosurgery Spine 2024-02-01

Patient values may be obscured when decisions are made under the circumstances of constrained time and limited counseling. The objective this study was to determine if a multidisciplinary review aimed at ensuring goal-concordant treatment perioperative risk assessment in high-risk orthopaedic trauma patients would increase quality frequency goals-of-care documentation without increasing rate adverse events.We prospectively analyzed longitudinal cohort adult treated for traumatic injuries...

10.2106/jbjs.oa.22.00107 article EN cc-by-nc-nd JBJS Open Access 2023-04-01

Given known failure rates after lateral plating of distal femur fractures, there is an increasing interest in augmenting fixation to improve outcomes. The addition medial plates or intramedullary nails have been described with promising results, decreasing nonunion and varus collapse rates. However, the use dual implants increases implant costs, adds surgical complexity, requires a second approach that may increase morbidity. A supplemental, percutaneously placed, column screw provide less...

10.1097/bot.0000000000002475 article EN Journal of Orthopaedic Trauma 2022-08-24

Normal biomechanics of the upper cervical spine, particularly at atlantooccipital joint, remain poorly characterized. The purpose this study was to determine intervertebral kinematics joint (occiput-C1) during three-dimensional in vivo physiologic movements. Twenty healthy young adults performed dynamic flexion/extension, axial rotation, and lateral bending while biplane radiographs were collected 30 images per second. Motion occiput-C1 tracked using a validated volumetric model-based...

10.1016/j.jbiomech.2024.112236 article EN cc-by Journal of Biomechanics 2024-07-20

Introduction: Patients within the US Veterans Health Administration (VA) system have higher rates of comorbidities and chronic pain, increasing risks complications/poor outcomes following spine surgery. Although use bone morphogenetic protein 2 (BMP-2) is established for anterior lumbar interbody fusion, its indications off-label in posterolateral fusion are unclear. The objective this study was to evaluate safety utility BMP-2 through a 15-year experience at VA. Methods: underwent...

10.5435/jaaosglobal-d-23-00122 article EN cc-by-nc-nd JAAOS Global Research and Reviews 2024-10-01

Background: Greater understanding of the impact skeletal maturity on outcomes is needed to guide operative treatment diaphyseal forearm fractures in children and adolescents. The purpose this study was compare complications pediatric treated with intramedullary nailing (IMN) or open reduction internal fixation (ORIF) identify a radiographic marker that will aid selecting between options. Methods: A retrospective review patients aged 10 16 years operatively for performed. Markers including...

10.1097/bpo.0000000000002853 article EN cc-by-nc-nd Journal of Pediatric Orthopaedics 2024-10-24

TO THE EDITOR: Response to Letter the Editor by Fukuda et al. Regarding Dynamic Changes in Lumbar Spine Kinematics During Gait May Explain Improvement Back Pain and Disability Patients with Hip-Spine Syndrome The authors would like thank colleagues for their interest comments. Hip-spine syndrome is a multifaceted disorder involving various anatomic patient-related factors, including each person's subjective evaluation of pain. Each patient has different ways describing symptoms many have...

10.1097/brs.0000000000004796 article EN Spine 2023-10-02

Background: Prior studies have highlighted lower rates of reoperation if fixation a displaced midshaft clavicle fracture is performed with dual plating (DP) compared single (SP). Despite higher initial costs associated the DP construct, observed reduction in secondary surgeries SP construct may make it more cost-effective treatment option. The objective this study was to assess cost-effectiveness patients operatively indicated fractures. Methods: We developed decision tree model occurrence...

10.2106/jbjs.23.00338 article EN Journal of Bone and Joint Surgery 2023-10-16
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