Rennie (1967) observed 12 children or adolescents with slipped upper femoral epiphysis and a close relative with the same. Two additional patients had a parent with osteoarthritis of the hip. This disorder was found by Ochsner et al. ... Rennie (1967) observed 12 children or adolescents with slipped upper femoral epiphysis and a close relative with the same. Two additional patients had a parent with osteoarthritis of the hip. This disorder was found by Ochsner et al. (1977) in 10 members of a family, with 2 other members showing coxarthrosis which may have been a sequel to subclinical slipped epiphysis. Male-to-male transmission was noted. Hagglund et al. (1986) studied 49 families, performing radiographic examinations of first-degree relatives and interviewing second-degree relatives in 4 of the 49 families. Slipped femoral capital epiphysis was found in 1 or more first-degree relatives. In another 13 families, radiographic signs were found. Three generations were affected in the family reported by Hagglund and Hansson (1986).