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Related Experiment Video

Updated: May 21, 2026

Lower Limb Biomechanical Analysis of Healthy Participants
06:36

Lower Limb Biomechanical Analysis of Healthy Participants

Published on: April 15, 2020

Comparison of two methods for interpreting lifting performance during functional capacity evaluation.

Peter Oesch1, Kathrin Meyer, Stefan Bachmann

  • 1Research Department, Department of Rheumatology, Rehabilitation Centre Valens, 7317 Valens, Switzerland. peter.oesch@kliniken-valens.ch

Physical Therapy
|June 2, 2012
PubMed
Summary

Waddell signs and observational effort assessment are not interchangeable for interpreting lifting performance in functional capacity evaluations for chronic low back pain patients. Effort determination has a greater impact than Waddell signs.

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Area of Science:

  • Occupational Health
  • Rehabilitation Medicine
  • Pain Management

Background:

  • Functional capacity evaluation (FCE) interpretation relies on effort assessment.
  • Waddell signs correlate with reduced functional performance.
  • Interchangeability of effort observation and Waddell signs for lifting performance is unestablished.

Purpose of the Study:

  • Assess concurrent validity of submaximal effort and Waddell signs.
  • Determine independent contributions to lifting performance.

Main Methods:

  • Cross-sectional study of 130 chronic nonspecific low back pain patients.
  • Effort assessed via observational criteria during lifting tasks.
  • Waddell sign testing performed by a second assessor.

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Last Updated: May 21, 2026

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  • Concurrent validity analyzed using sensitivity and specificity.
  • Hierarchical regression modeled contributions to lifting performance.

    • Main Results:

    • Waddell signs showed low sensitivity for detecting submaximal effort (53-63%).
    • Both Waddell signs and submaximal effort independently predicted lifting performance.
    • Submaximal effort had a larger impact on lifting performance than Waddell signs.

    Conclusions:

    • Waddell sign testing and observational effort assessment are not interchangeable for FCE lifting performance interpretation.
    • Assessor variability may influence findings.
    • Clinical guidelines should differentiate these assessment methods.