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What Are the Validity of the Single-Leg-Squat Test and Its Relationship to Hip-Abduction Strength?

Mario A. DiMattia, Ann L. Livengood, Tim L. Uhl, Carl G. Mattacola, and Terry R. Malone

Context:

The Trendelenburg and single-leg-squat (SLS) tests are purported measures of hip-abduction strength that have not been previously validated.

Objective:

To correlate isometric hip-abduction strength to frontal-plane hip motion during an SLS and determine the criterion validity of a clinical-observation-analysis method to grade an SLS against 2-dimensional kinematic analysis.

Design:

Single-measure, concurrent validity.

Setting:

Biodynamics research laboratory.

Participants:

50 uninjured participants.

Main Outcome Measures:

Hip-abduction strength and hip and knee kinematic data during a Trendelenburg test and an SLS.

Results:

A weak, positive correlation between hip-abduction strength and hip-adduction angle was found during both the Trendelenburg (r = .22, P = .13) and the SLS (r = .21, P = .14) tests. The observation-analysis method revealed a low sensitivity, .23, and a higher specificity, .86, when compared with the kinematic data.

Conclusion:

The usefulness of the Trendelenburg and SLS test in screening hip-abductor strength in a healthy physically active population is limited. The origin of observable deficits during SLS requires further objective assessment.

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“Dynamic Trendelenburg”: Single-Leg-Squat Test for Gluteus Medius Strength

Ann L. Livengood, Mario A. DiMattia, and Tim L. Uhl

Column-editor : Carl G. Mattacola