Background. The differential diagnosis of children with acute non-traumatic hip pathology varies from quite harmless conditions such as transient synovitis of the hip to more severe problems like Perthes' disease, slipped capital femoral epiphysis (SCFE) and life-threatening conditions such as septic arthritis of the hip. Objective. To provide population-based data on symptom presentation and incidence rates of non-traumatic acute hip pathology in family practice. Methods. We analysed data from a large national survey of family practice (104 practices), which was carried out by the Netherlands Institute for Health Services Research (NIVEL) in 2001. We included all children aged 0-14 years. Incidence rates were calculated by dividing the total number of cases (numerator) by the average study population at risk (denominator). Results. Our study population consisted of 73 954 children aged 0-14 years, yielding 68 202 person-years. These children presented with 101 episodes of acute non-traumatic hip pathology. The presenting feature in 81.5% of the children was pain, in 8.6% limping and 9.9% presented with both symptoms. Only 27% of the participating family practitioners (FPs) reported whether the child had a fever. The incidence rate for all acute non-traumatic hip pathology was 148.1 per 100 000 person-years, and for transient synovitis, this was 76.2 per 100 000 person-years. Conclusion. In family practice, most children with acute non-traumatic hip pathology present with pain as the initial symptom. FPs need to be more aware that fever is the main distinguishing factor between a harmless condition and a life-threatening condition. Transient synovitis is the diagnosis with the highest incidence rate.

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Keywords Children, Family practice, Hip pathology, Incidence, Transient synovitis
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Krula, M, van der Woudena, J.C, Schellevis, F.G, van Suijlekom-Smitd, L.W.A, & Koesa, B.W. (2009). Acute non-traumatic hip pathology in children: Incidence and presentation in family practice. Family Practice: an international journal, 27(2), 166–170. doi:10.1093/fampra/cmp092