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Dynamic upper limb proprioception in multidirectional shoulder instability.

John M Barden1, Robert Balyk, V James Raso

  • 1Department of Surgery, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada. john.barden@uregina.ca

Clinical Orthopaedics and Related Research
|April 2, 2004
PubMed
Summary
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Subjects with multidirectional shoulder instability struggle with proprioception, leading to greater upper limb repositioning errors. This suggests a reduced capacity to use proprioception for motor control in these individuals.

Area of Science:

  • Orthopedics
  • Neuroscience
  • Biomechanics

Background:

  • Shoulder instability affects proprioception, the sense of limb position.
  • Understanding proprioceptive deficits is crucial for rehabilitation.

Purpose of the Study:

  • To investigate the use of proprioception in upper limb repositioning tasks for individuals with multidirectional shoulder instability.
  • To compare proprioceptive accuracy between subjects with and without shoulder instability.

Main Methods:

  • Twelve subjects with multidirectional shoulder instability and 12 controls performed blindfolded upper limb repositioning tasks.
  • Three movements were tested: overhead reaching, scapular plane pointing, and humeral external rotation with abduction.
  • A 3D motion analysis system quantified spatial hand position error.

Related Experiment Videos

Main Results:

  • Subjects with multidirectional shoulder instability exhibited significantly greater hand position error than controls.
  • No significant difference in error was found between symptomatic and asymptomatic limbs in the instability group.
  • Both groups showed improved accuracy within the first three movement repetitions, indicating dynamic proprioception's role.

Conclusions:

  • Multidirectional shoulder instability is associated with impaired proprioceptive feedback for upper limb motor control.
  • Individuals with this condition may have a diminished ability to refine and control upper limb movements using proprioception.
  • These findings highlight the importance of proprioceptive training in the rehabilitation of shoulder instability.