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Reliability of lower extremity functional performance tests

L A Bolgla1, D R Keskula

  • 1Center for Sports Medicine, Medical College of Georgia Hospital and Clinics, Augusta 30912, USA.

The Journal of Orthopaedic and Sports Physical Therapy
|September 1, 1997
PubMed
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Functional performance tests reliably measure lower extremity function for athletes returning to sports. Standardized protocols ensure consistent results for single hop, triple hop, and crossover hop tests.

Area of Science:

  • Sports Medicine
  • Orthopedics
  • Rehabilitation

Background:

  • Functional performance tests are routinely used by clinicians to assess an athlete's readiness for return to sport.
  • The reliability of these lower extremity performance measures has been under-researched.
  • Assumptions of reliability exist without robust scientific validation.

Purpose of the Study:

  • To determine the reliability of commonly used lower extremity functional performance tests.
  • To evaluate the consistency of measurements for specific hop tests.
  • To provide evidence for the clinical utility of these tests.

Main Methods:

  • Five male and 15 female volunteers participated.
  • Evaluated tests included single hop for distance, triple hop for distance, 6-m timed hop, and cross-over hop for distance.

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  • One clinician administered tests using a standardized protocol, with retesting approximately 48 hours later.

    • Main Results:

    • High reliability (ICC > .95) and low standard error of measurement (SEM) were found for single hop, triple hop, and cross-over hop for distance tests.
    • The 6-m timed hop showed moderate reliability (ICC = .66) with a small SEM, indicating acceptable measurement consistency.
    • No significant differences were found between trials, except for the single hop, suggesting a potential learning effect.

    Conclusions:

    • Clinicians can reliably use standardized functional performance tests to measure lower extremity performance.
    • These tests provide consistent data crucial for return-to-sport decisions.
    • The findings support the use of these functional tests in clinical practice for objective athlete assessment.