This prospective study compared 3-D shoulder kinematics and scapular muscle EMG in 26 construction workers with impingement symptoms versus 26 matched asymptomatic controls. Subjects performed scapular-plane arm elevation under three load conditions (unloaded, 2.3 kg, 4.6 kg) across the painful arc (31°–120°). The goal was to identify which specific movement and muscle-activation abnormalities actually exist in symptomatic overhead workers.
Before this paper, impingement rehabilitation often meant either generic rotator cuff strengthening or broad scapular stabilization programs — with little objective data to distinguish which muscles were actually dysfunctional.
This study gives you a specific target: serratus anterior, not the trapezius. The trapezius is already overcompensating. Adding more trapezius-dominant exercises (rows, shrugs, Y-T-W variations that load the lower trap) without first restoring serratus anterior function will not correct the anterior tipping deficit at end-range.
When you see an overhead worker with impingement symptoms, the key clinical question is not 'is the scapula moving?' but 'is the anterior acromion being elevated at end-range?' Serratus anterior drives that posterior tipping; the trapezius cannot substitute for it.
One nuance worth knowing: kinematic deficits in this population are load-dependent. A clinical exam with the arm unloaded may look normal. The breakdown appears when the patient holds a tool or weight overhead, exactly replicating their occupational exposure.
Alterations in Shoulder Kinematics and Associated Muscle Activity in People with Symptoms of Shoulder Impingement.
Radiological Assessment of Osteo-Arthrosis.
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Traumatic Arthritis of the Hip after Dislocation and Acetabular Fractures: Treatment by Mold Arthroplasty. an End-Result Study Using a New Method of Result Evaluation.
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The Value of Postural Reduction in the Initial Management of Closed Injuries of the Spine with Paraplegia and Tetraplegia. I.
Vacuum-Assisted Closure: a New Method for Wound Control and Treatment: Animal Studies and Basic Foundation.
A System for the Functional Evaluation of Reconstructive Procedures after Surgical Treatment of Tumors of the Musculoskeletal System.
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The Tension-Stress Effect on the Genesis and Growth of Tissues. Part I. the Influence of Stability of Fixation and Soft-Tissue Preservation.
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Hip Morphology Influences the Pattern of Damage to the Acetabular Cartilage: Femoroacetabular Impingement as a Cause of Early Osteoarthritis of the Hip.
Porosity of 3D Biomaterial Scaffolds and Osteogenesis.
A Report: the Definition and Classification of Cerebral Palsy April 2006.
Clinician's Guide to Prevention and Treatment of Osteoporosis.
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Epidemiology of Adult Fractures: a Review.
Centers for Disease Control and Prevention Guideline for the Prevention of Surgical Site Infection, 2017.
Osteoblastic Cells Regulate the Haematopoietic Stem Cell Niche.
A Joint Coordinate System for the Clinical Description of Three-Dimensional Motions: Application to the Knee.
Consensus Statement on Concussion in Sport-The 5th International Conference on Concussion in Sport Held in Berlin, October 2016.
Oarsi Guidelines for the Non-Surgical Management of Knee Osteoarthritis.
Estimating the Prevalence of Limb Loss in the United States: 2005 to 2050.
Metastasis to Bone: Causes, Consequences and Therapeutic Opportunities.
Role of Proinflammatory Cytokines in the Pathophysiology of Osteoarthritis.
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Osteoporosis: Now and the Future.
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Transfusion of Plasma, Platelets, and Red Blood Cells in a 1:1:1 vs. a 1:1:2 Ratio and Mortality in Patients with Severe Trauma: the Proppr Randomized Clinical Trial
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This prospective study compared 3-D shoulder kinematics and scapular muscle EMG in 26 construction workers with impingement symptoms versus 26 matched asymptomatic controls. Subjects performed scapular-plane arm elevation under three load conditions (unloaded, 2.3 kg, 4.6 kg) across the painful arc (31°–120°). The goal was to identify which specific movement and muscle-activation abnormalities actually exist in symptomatic overhead workers.
Before this paper, impingement rehabilitation often meant either generic rotator cuff strengthening or broad scapular stabilization programs — with little objective data to distinguish which muscles were actually dysfunctional.
This study gives you a specific target: serratus anterior, not the trapezius. The trapezius is already overcompensating. Adding more trapezius-dominant exercises (rows, shrugs, Y-T-W variations that load the lower trap) without first restoring serratus anterior function will not correct the anterior tipping deficit at end-range.
When you see an overhead worker with impingement symptoms, the key clinical question is not 'is the scapula moving?' but 'is the anterior acromion being elevated at end-range?' Serratus anterior drives that posterior tipping; the trapezius cannot substitute for it.
One nuance worth knowing: kinematic deficits in this population are load-dependent. A clinical exam with the arm unloaded may look normal. The breakdown appears when the patient holds a tool or weight overhead, exactly replicating their occupational exposure.