Measurement of strength of hip joint muscles.

A standard procedure for measurement of hip muscle strength with an isokinetic dynamometer is presented. The method is based on recordings in supine position and firm stabilisation of the pelvis. Abduction and adduction movements can be done without friction. The position of the dynamometer and its rotation centre is indicated. The reproducibility was studied by a test-retest procedure. The methodological error varied between 4% and 10.5% and the coefficient of reliability varied between 0.80-0.99. The coefficient of variation when measuring one testing subject at ten different occasions was smaller at isokinetic than isometric measurements.