title: The epidemiology of bilateral slipped capital femoral epiphysis. A study of children in Michigan.
abstract: The records of 224 children who had a slipped capital femoral epiphysis and who had no underlying metabolic or endocrine disorder were studied retrospectively to investigate the epidemiology of bilateral slipped capital femoral epiphysis. Eighty-two (37 per cent) of the 224 children (fifty-one boys and thirty-one girls) had a bilateral slip. Sixty-four of these children were black and eighteen were white. The age at the time of the diagnosis of the first slip was 13 +/- 1.7 years (mean and standard deviation), the duration of the symptoms was 5 +/- 5.0 months, and the angle of the slip was 26 +/- 16 degrees. Obese children were younger at the time of the diagnosis of the first slip (12 +/- 1.6 compared with 13 +/- 1.6 years for the children who were not obese, p = 0.001). The diagnosis of a slipped capital femoral epiphysis was made simultaneously in both hips in forty-one children and sequentially in forty-one children. Compared with the children in whom both hips were diagnosed simultaneously, the children in whom the hips were diagnosed sequentially had had a shorter duration of the symptoms before the diagnosis of the first slip (3 +/- 2.4 compared with 7 +/- 5.9 months, p = 0.0003), were younger at the time of the diagnosis of the first slip (12 +/- 1.9 compared with 13 +/- 1.2 years, p = 0.001), and tended to be more obese (p = 0.025). In 88 per cent of the patients who had sequential slips, the second slip was diagnosed within eighteen months after the diagnosis of the first slip.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Section of Orthopaedic Surgery, University of Michigan School of Medicine, Ann Arbor 48109-0328.
authors.forename: R T
authors.initials: RT
authors.lastname: Loder
authors.forename: D D
authors.initials: DD
authors.lastname: Aronson
authors.forename: M L
authors.initials: ML
authors.lastname: Greenfield
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D004839:Epiphyses, Slipped / Q000150:complications / Q000453:epidemiology* / Q000473:pathology; D005260:Female; D005270:Femur Head; D006801:Humans; D008297:Male; D008824:Michigan; D009765:Obesity / Q000150:complications; D015995:Prevalence; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors