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Abnormal joint mobility is an important factor in movement dysfunction and physical disability. Because the decision to treat impaired joint mobility in an older individual may be influenced by assumptions concerning normal range of motion (ROM) at older ages, it is important to establish population-based normative values for hip and knee ROM by age, race, and sex. This study used data from the first National Health and Nutrition Examination Survey (NHANES 1), which involved a national probability sample of persons drawn from the civilian noninstitutionalized population of the United States. Goniometric measurements of hip and knee active range of motion (AROM) were obtained from a subset of the sample consisting of 1,892 subjects. This analysis was limited to the 1,313 white and 370 black subjects. Univariate statistics, weighted by the probability of selection into the sample, were calculated for 12 sex-race …