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Assessing the Reliability of Measurements from the Krusen Limb Load Monitor to Analyze Temporal and Loading Characteristics of Normal Gait

Ms. Carey was a graduate physical therapy student in the Division of Physical Therapy, Emory University School of Medicine, Atlanta, GA, when this study was performed; she is now Assistant Director of Physical Therapy, Rehabilitation Institute of New Orleans, F. Edward Hebert Rehabilitation Hospital, New Orleans, LA 70114 (USA).
Dr. Wolf is a senior investigator at Emory University Regional Rehabilitation Research and Training Center, Emory University School of Medicine, 1441 Clifton Road NE, Atlanta, GA.
Mr. Binder-Macleod was a research associate at the Emory University Rehabilitation Research and Training Center, and an Instructor, Department of Community Health, Division of Physical Therapy, Emory University School of Medicine, when this study was performed. He is now a doctoral student, Department of Physiology, Medical College of Virginia, Virginia Commonwealth University, Richmond, VA.
Dr. Bain is Assistant Professor, Department of Biometry, Emory University School of Medicine, Atlanta, GA.

This study assessed the reliability of measurements made by four physical therapists on healthy subject gait data recorded from the Krusen limb load monitor. The five components of step (stance time, time up, time to second peak, and force at the first and second peaks) were analyzed. Six components contributing to gait (ambulation time; velocity; cadence; average swing phase duration, left lower extremity; average swing phase duration, right lower extremity; and ratio of unilateral weight bearing, right lower extremity to left lower extremity) were also analyzed. Intraclass correlation coefficients for the five step components and the gait measures of ambulation time, velocity, and cadence showed high measurement reliability. The other measures of gait showed low intraclass correlation coefficients. The limb load monitor can, therefore, be used by clinicians to measure the five step components and three gait measures (ambulation time, velocity, and cadence) with high measurement reliability.

Key Words: Gait • Physical therapy

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