SHOULDER KINEMATICS IN PATIENTS WITH ANTERIOR INSTABILITY

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SHOULDER KINEMATICS IN PATIENTS WITH ANTERIOR
INSTABILITY

• A.G. Mell, S. LaScalza, J. Ray,
• M. Maciejewski, R.E. Hughes, J.E. Carpenter
• University of Michigan
• Department of Orthopaedic Surgery

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AMY MELL
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INTRODUCTION

• Shoulder rhythm
• Cuff pathology and healthy subjects
• Instability patients
• Poppen and Walker (1976)
• Howell et al. (1988)
• von Eisenhart et al. (2002, 2005)

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STUDY OBJECTIVE

• To test the hypothesis that anterior shoulder
  instability affects shoulder rhythm when reaching
  from front to back.

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STUDY PARTICIPANTS

• Patients
• History of recurrent anterior shoulder
  instability (subluxation or dislocation)
• Three or more episodes
• No episode within six weeks of testing
• Healthy Controls
• No history of shoulder pain or trauma

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STUDY PARTICIPANTS
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SCAPULAR TRACKER
Karduna, A. et al. (2001) J. Biomech. Eng.
123184-190
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HUMERAL TRACKER
LaScalza, S. et al. (2002) J. Applied Biomech.
18374-383
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STARTING POSITION
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REACH TO BACK - LOW
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STARTING POSITION
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REACH TO BACK - HIGH
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DATA ANALYSIS
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REACH TO BACK - LOW
63
58
19
20
23
Plt0.05
17
15
REACH TO BACK - HIGH
33
38
32
25
37
35
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DISCUSSION

• Conclusions
• Similar motion during high reach
• Less torso motion during low reach for
  instability group
• Limitations
• Power analysis
• Simplified kinematic analysis

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ACKNOWLEDGEMENTS

• People
• Mark Stock
• John E. Kuhn, M.D.
• Ed Wojtys, M.D.
• Steve Goldstein, Ph.D.
• Funding
• Clinical Partnership Research Fund of the
  University of Michigan
• Organizations
• Orthopaedic Research Laboratories

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THANK YOU
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ELEVATION IN SCAPULAR PLANE
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DATA PROCESSING
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ELEVATION
Plt0.05