Roaas, A. and Andersson, G.B.J. 1982. Normal Range of Motion of the Hip, Knee and Ankle Joints in Male Subjects, 30–40 Years of Age. Acta Orthopaedica. 53, 2 (Jan. 1982), 205–208. DOI:https://doi.org/10.3109/17453678208992202.