PMID: 20120677Feb 4, 2010Paper

Is magnetic resonance imaging necessary for normal plain radiography evaluation of contralateral non-traumatic asymptomatic femoral head in high osteonecrosis risk patient

Journal of the Medical Association of Thailand = Chotmaihet Thangphaet
Kriangsak PiyakunmalaKeerati Chareonchonvanitch

Abstract

To examine the incidence rate and extension of non-traumatic asymptomatic osteonecrosis of the contralateral femoral head (ONFH) in high-risk patient groups. A cross-sectional design was used. We studied patients who visited at Orthopedics department, Khon Kaen hospital between January 2007 and December 2008. Only high-risk patients diagnosed with non-traumatic osteonecrosis in index side by plain radiography and asymptomatic contralateral sides with normal plain radiography evaluated for non-traumatic femoral head osteonecrosis were included in the analysis. We evaluated both hips of individual patient by MRI to determine the incidence, staging, and extension area of osteonecrosis. Thirty-two patients with index femoral head osteonecrosis and non-traumatic asymptomatic contralateral femoral head were studied. Average age of these patients was 46.38 years. The most common risk factors were alcohol (78.12%) and corticosteroid use (18.75%). Osteonecrosis of the contralateral femoral head (ONFH) was found in 22 patients (68.75%). These hips were in stage VI (87.5%) with 99.05% extension area of osteonecrosis, large extension, C- location, and mix intensity of MRI on index side. We found stage I in all patients (100%), 80.62% exten...Continue Reading

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