title: The incidence of physiolysis of the hip: a population-based study of 175 patients.
abstract: We studied the epidemiology of physiolysis of the hip (or slipped capital femoral epiphysis) between 1946 and 1992 in 175 patients from a well-defined population. The incidence of physiolysis of the hip was calculated using the attack rate method, i.e., the sum of the annual incidences in each 1-year group. The risk of developing physiolysis was 1:998 for boys, 1:1756 for girls and 1:1267 for both sexes and did not change significantly during this period. The average age at diagnosis was 13.6 (7-17) years in boys and 12.1 (8-15) years in girls and did not change to a significant degree during this period. The difference in the boy:girl ratio (1.8:1) and in the preponderance of the left hip being affected first (64% for boys and 52% for girls) did not change significantly during this period. No significant monthly variation was found in the onset of symptoms of physiolysis of the hip.
authors.affiliation: Department of Orthopedics, Ostra Hospital, Gothenburg, Sweden.
authors.forename: R
authors.initials: R
authors.lastname: Jerre
authors.forename: J
authors.initials: J
authors.lastname: Karlsson
authors.forename: B
authors.initials: B
authors.lastname: Henrikson
mesh_terms: D000293:Adolescent; D002648:Child; D004839:Epiphyses, Slipped / Q000453:epidemiology*; D005260:Female; D006621:Hip Joint; D006801:Humans; D015994:Incidence; D008297:Male; D017678:Sex Distribution; D013548:Sweden / Q000453:epidemiology