Stephen J. Thomas

ORCID: 0000-0003-0910-9945
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About
Contact & Profiles
Research Areas
  • Shoulder Injury and Treatment
  • Shoulder and Clavicle Injuries
  • Sports injuries and prevention
  • Nerve Injury and Rehabilitation
  • Orthopedic Surgery and Rehabilitation
  • Tendon Structure and Treatment
  • Elbow and Forearm Trauma Treatment
  • Musculoskeletal pain and rehabilitation
  • Muscle activation and electromyography studies
  • Cardiovascular Syncope and Autonomic Disorders
  • Geophysics and Sensor Technology
  • Foot and Ankle Surgery
  • Peripheral Nerve Disorders
  • Exercise and Physiological Responses
  • Spine and Intervertebral Disc Pathology
  • Gear and Bearing Dynamics Analysis
  • Advanced Fiber Optic Sensors
  • Lower Extremity Biomechanics and Pathologies
  • Sports Performance and Training
  • Advanced Fiber Laser Technologies
  • Cardiac, Anesthesia and Surgical Outcomes
  • Prosthetics and Rehabilitation Robotics
  • CCD and CMOS Imaging Sensors
  • Veterinary Pharmacology and Anesthesia
  • Cardiovascular and exercise physiology

Thomas Jefferson University
2020-2025

Jefferson College of Health Sciences
2022-2025

Jefferson College
2022-2025

Rothman Orthopaedics
2022-2023

Georgetown University Medical Center
2023

Rothman Institute
2022-2023

Georgetown University
2023

Georgia Southern University
2022

University of Pennsylvania
2010-2020

Temple University
2015-2020

Abstract Context: Anterior instability and impingement are common in overhead athletes have been associated with decreases internal rotation (IR) increases external (ER) motion. However, the chronology effect of different female sports on these conditions yet to be determined. Objective: To measure glenohumeral IR ER rotation, total range motion, scapular position over a single competitive season. Design: Multiple group pretest-posttest study. Setting: High school. Patients or Other...

10.4085/1062-6050-44.3.230 article EN Journal of Athletic Training 2009-05-01

Abstract Context: Conditions such as labral and rotator cuff injuries have been linked with decreases in glenohumeral internal-rotation increases external-rotation motion. Also, decreased internal rotation is strongly associated scapular dyskinesis. Objective: To compare healthy collegiate high school baseball players' joint range of motion position. Design: Cross-sectional study. Setting: Institutional research laboratory. Patients or Other Participants: Thirty-one male National Collegiate...

10.4085/1062-6050-45.1.44 article EN Journal of Athletic Training 2010-01-01

Abstract The rotator cuff musculature imparts dynamic stability to the glenohumeral joint. In particular, balance between subscapularis anteriorly and infraspinatus posteriorly, often referred as “force couple,” is critical for concavity compression concentric rotation of humeral head. Restoration this anterior–posterior force after chronic, massive tears may allow deltoid compensation, but no in vivo studies have quantitatively demonstrated an improvement shoulder function. Our goal was...

10.1002/jor.21361 article EN Journal of Orthopaedic Research® 2011-02-09

Achilles tendon ruptures are common and devastating injuries; however, an optimized treatment rehabilitation protocol has yet to be defined. Therefore, the objective of this study was investigate effects surgical repair return activity on joint function properties after 3 weeks healing. Sprague-Dawley rats (N = 100) received unilateral blunt transection their tendon. Animals were then randomized into repaired or non-repaired treatments, further groups that returned 1 week (RTA1) (RTA3) limb...

10.1002/jor.23253 article EN Journal of Orthopaedic Research® 2016-04-02

Achilles tendon ruptures are traumatic injuries, and techniques for assessing repair outcomes rely on patient-based measures of pain function, which do not directly assess healing. Consequently, there is a need quantitative, in vivo measure properties. Therefore, the purpose this study was to validate ultrasound imaging evaluating collagen organization tendons. In study, we compared our novel, high-frequency (HFUS) analysis method standard organization, crossed polarizer (CP) imaging....

10.1115/1.4026285 article EN Journal of Biomechanical Engineering 2013-12-19

Context: Ankle sprains are common in athletes, with functional ankle instability (FAI) developing approximately half of cases. The relationship between laxity and FAI has been inconclusive, suggesting that may be caused by insufficient sensorimotor function dynamic restraint. Research suggested deafferentation peripheral mechanoreceptors potentially causes FAI; however, direct evidence confirming sensory deficits elusive because previous investigators relied upon subjective proprioceptive...

10.4085/1062-6050-48.1.09 article EN Journal of Athletic Training 2013-03-01

Background Anecdotal evidence suggests an association between glenohumeral internal rotation deficits (GIRD) and scapular dysfunction, observable alteration in the normal position or motion of scapula relation to thoracic cage. Questions/purposes We therefore hypothesized players with GIRD (15° greater) will have decreased dominant arm upward increased protraction compared baseball (14° less). Methods studied 43 no current shoulder elbow symptoms; 22 had 15° greater 21 14° less. measured...

10.1007/s11999-009-1124-z article EN Clinical Orthopaedics and Related Research 2009-10-19

Context: Pathologies such as anterior instability and impingement are common in baseball have been linked to decreases internal rotation (IR) concurrent increases external (ER). In addition, alterations scapular position identified this population, but the chronology of these adaptations is uncertain. Objectives: To determine whether there a change range motion after single season. Design: Prospective cohort. Setting: High school. Participants: 19 high school players (age 16.6 ± 0.8 y, mass...

10.1123/jsr.19.2.125 article EN Journal of Sport Rehabilitation 2010-05-01

ABSTRACT Shoulder tendon injuries are frequently seen in the presence of abnormal scapular motion, termed dyskinesis. The cause and effect relationship between dyskinesis shoulder injury has not been directly defined. We developed used an animal model to examine initiation progression pathological changes rotator cuff biceps tendon. Sixty male Sprague–Dawley rats were randomized into two groups: nerve transection (to induce dyskinesis, SD) or sham (control). animals euthanized 4 8 weeks...

10.1002/jor.22693 article EN Journal of Orthopaedic Research® 2014-07-28

ABSTRACT The rotator cuff assists in shoulder movement and provides dynamic stability to the glenohumeral joint. Specifically, anterior–posterior (AP) force balance, provided by subscapularis anteriorly infraspinatus teres minor posteriorly, is critical for joint concentric rotation of humeral head on glenoid. However, limited understanding exists consequences associated with disruption AP balance (due tears both supraspinatus tendons) function damage. We investigated effect disrupting...

10.1002/jor.22586 article EN Journal of Orthopaedic Research® 2014-01-25

ABSTRACT Recently, diabetes has been linked to rotator cuff disease and adhesive capsulitis, conditions with increased stiffness inflammation. Unfortunately, limited research exists examining how hyperglycemia affects the native shoulder (tendon capsule) properties. Therefore, objectives of this study were compare joint mechanics, tendon properties (mechanics immunohistochemistry), capsule healthy control hyperglycemic rats 8 weeks following induction a submaximal dose streptozotocin (STZ)....

10.1002/jor.22695 article EN Journal of Orthopaedic Research® 2014-07-28
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