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Test-Retest Reliability of Single-Arm Closed Kinetic Chain Upper Extremity Stability Test.

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A new single-arm Closed Kinetic Chain Upper Extremity Stability Test (CKCUEST) shows high test-retest reliability for individual arm performance in healthy adults. However, the limb symmetry index (LSI) derived from this test demonstrated questionable reliability.

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Area of Science:

  • Biomechanics and Kinesiology
  • Sports Medicine and Rehabilitation
  • Orthopedic Physical Therapy

Background:

  • The original Closed Kinetic Chain Upper Extremity Stability Test (CKCUEST) lacks personalization for hand placement and assessment of limb asymmetry.
  • Existing CKCUEST limitations hinder accurate evaluation of upper extremity function and potential imbalances.
  • A modified single-arm CKCUEST aims to address these limitations by normalizing arm length and enabling limb symmetry assessment.

Purpose of the Study:

  • To evaluate the test-retest reliability of a novel single-arm CKCUEST.
  • To assess the reliability of the limb symmetry index (LSI) derived from the modified test.
  • To determine the validity of the new CKCUEST protocol in healthy young adults.

Main Methods:

  • Twelve healthy young adults participated after providing informed consent and meeting exclusion criteria.
  • Participants performed the single-arm CKCUEST in a push-up position with normalized hand placement based on arm length.
  • Test-retest reliability was assessed using Intraclass Correlation Coefficients (ICC(3,1)) for individual arm tests and LSI.

Main Results:

  • The single-arm CKCUEST demonstrated good to excellent test-retest reliability for individual arm performance (ICC(3,1) = 0.88-0.93).
  • Reliability of the Limb Symmetry Index (LSI) was questionable (ICC(3,1) = 0.53), indicating substantial variability.
  • Agreement for the direction of asymmetry (preferred limb) was substantial (Kappa coefficient = 0.62).

Conclusions:

  • The new single-arm CKCUEST exhibits high test-retest reliability for assessing individual upper extremity stability in healthy young adults.
  • The Limb Symmetry Index (LSI) derived from this test requires further investigation due to questionable reliability.
  • This modified CKCUEST offers a more personalized and potentially useful tool for clinical assessment of upper extremity function.