Rytökoski U.; Karppi, S.-L.; Puukka, P.; Soini, J.; Rönnemaa, T.Journal of Spinal Disorders: February 1994 Original Articles: PDF Only Buy Abstract Summary: The reproducibility of measurements with the triaxial lumbar dynamometer Isostation B-200 was measured in 61 volunteers with or without low back problems. Both for the intra- and interrater measurements the reproducibility was good (r = 0.76−0.89) for lateral flexions and almost as good (r = 0.76−0.87) for the sum of all ranges of motion (SROM). The corresponding reproducibilities were excellent (r = 0.82−0.99) for the isometric strength and good (r = 0.60−0.90) for isoinertial flexion-extension repetition test parameters in the main (primary axis) direction. A number of parameters were combined into three functional indices: the reproducibility for “power” and “work” index was good (r = 0.76−0.94) in both intra- and interrater conditions, whereas for “movement” index it was somewhat weaker (r = 0.53−0.87). It is concluded that parameters: lateral flexions, SROM, isometric strength, and functional indices (power and work) are reproducible enough to use in further studies. Address correspondence and reprint requests to Dr. U. Rytökoski at The Rehabilitation Research Centre of the Social Insurance Institution, Peltolantie 3, 20720 Turku, Finland. © Lippincott-Raven Publishers.