Document Type

Poster

Publication Date

2025

Abstract

Introduction

  • Background: Following a TSA, patients achieve pain relief, restoration of range of motion, improvements in patient-reported outcomes, and report overall satisfaction with their replaced shoulder3-5
  • Purpose: To examine Scapulothoracic (ST) kinematics on self-reported shoulder function outcomes
  • Hypothesis: There will be a statistically significant correlation between ST kinematics and self-reported satisfaction of function in participants who are more than one year post-a TSA

Methods

  • Participants: 14 subjects between 56-81 years old who underwent a TSA replacements at least one year ago by 1 of 3 orthopedic surgeons from one midwestern healthcare organization
  • Tests & Measures:
    • Penn Shoulder Scale (PSS)
    • Disabilities of the Arm, Shoulder and Hand(DASH)
    • G4 motion capture

Analysis

Study Design:

  • Assess for correlation between DASH and PSS and between the kinematic data of Upward Rotation (UR), Internal Rotation (IR), Posterior Tilting (PT) of the scapula using Spearman’s Rank Order Correlations
  • SPSS 29(Chicago, IL) was used for analyses; p < 0.05

Results

  • Mean PSS score: 86.50
  • Mean DASH score: 8.09
  • Correlation of PSS to scapular Internal rotation (r =-.371, p = 0.171)
  • Post-Hoc analysis findings: Sample size of 50 participants may yield significant correlation

Discussion

  • Further investigation needed
  • Changing from DASH to PSS changes shoulder function correlation
    • PSS specifically asks patients to rate difficulty of performing tasks with operative limb, which may not be the extremity normally used for that task
    • DASH is non-specific and asks patient to rate difficulty of performing the task with either limb

Conclusion

  • No significant correlation between scapulothoracic kinematics and shoulder function
  • A larger sample size would likely reveal correlation between PSS and Internal Rotation

Clinical Relevance

Further research could allow emphasis on specific motions during rehabilitation to promote improved function

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