Test-Retest repeatability of gluteus maximus strength testing using a fixed digital dynamometer in children with cerebral palsy  Mariëtta L. van der Linden, PhD, Alison M. Aitchison, BSc, MCSP, M.Elizabeth Hazlewood, MCSP, Susan J. Hillman, MSc, CEng, James E. Robb, BSc  Archives of Physical Medicine and Rehabilitation  Volume 85, Issue 12, Pages 2058-2063 (December 2004) DOI: 10.1016/j.apmr.2003.12.037

Fig 1 Testing of gluteus maximus strength using the MIE myometer (top) with the hip in neutral and (bottom) with the hip flexed at 45°. (A) Display monitor, (B) rigid frame, and (C) force transducer. Archives of Physical Medicine and Rehabilitation 2004 85, 2058-2063DOI: (10.1016/j.apmr.2003.12.037)

Fig 2 Bland-Altman plots 19 for the CP group showing value of the 3 repeated measurements: (A) maximum value, hip neutral; (B) mean value, hip neutral; (C) maximum value, hip flexed at 45°; and (D) mean value, hip flexed at 45°. NOTE. The difference between the measurements on the 2 occasions is plotted against the average of the measurements on the 2 occasions. The average difference and the limits of agreement (average ±2 SD) are also included. Archives of Physical Medicine and Rehabilitation 2004 85, 2058-2063DOI: (10.1016/j.apmr.2003.12.037)

Fig 3 Bland-Altman plots 19 for the control group showing value of the 3 repeated measurements: (A) maximum value, hip neutral; (B) mean value, hip neutral; (C) maximum value, hip flexed at 45°; and (D) mean value, hip flexed at 45°. NOTE. The difference between the measurements on the 2 occasions is plotted against the average of the measurements on the 2 occasions. The average difference and the limits of agreement (average ±2 SD) are also included. Archives of Physical Medicine and Rehabilitation 2004 85, 2058-2063DOI: (10.1016/j.apmr.2003.12.037)