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In this recent article published in the journal Archives of Physical Medicine and Rehabilitation, scientists in Melbourne, Australia conducted a study "To examine the relative and absolute intrarater test-retest reliability of muscle strength and range of motion (ROM) measurements of the hip performed in people with hip osteoarthritis. Repeated measures. Human movement laboratory of a university."
"Participants (N=22; 10 men, 12 women; age range, 50-84y) with hip osteoarthritis. On 2 separate occasions, at least I week apart, isometric torque measurements were obtained from the hip rotators, flexors, abductors, and extensors. Passive ROMs in hip rotation, flexion, abduction, and extension were also determined. Relative reliability was estimated using the intraclass correlation coefficient, model 2,2 (ICC2,2). Absolute reliability was estimated using the coefficient of variation (CV) and the standard error (SE) of measurement. For measurements of muscle strength, ICC2.2 ranged from .84 to.97, and the CV ranged from 8% to 15.7%. Hip extensors and internal and external rotators showed high ICC2,2 (>.96) and low CV (
The researchers concluded: "Strength and ROM testing of the hip in people with hip osteoarthritis can be performed with good to excellent reliability."
Pua and colleagues published their study in Archives of ...