Early Diagnosis of Avascular Necrosis by Magnetic Resonance Imaging
The basic principles of magnetic resonance imaging (MRI) are quite complicated and are beyond the scope of this presentation. This technique depends upon the fact that, in an external magnetic field, certain atomic nuclei can be made to emit a radio frequency signal which is used to generate the image. This signal is sensitive to subtle physiologic and biochemical changes. It can therefore distinguish quite early between healthy and diseased tissue [1–9]. Since the early diagnosis of avascular necrosis (AVN) is essential if we hope to improve its treatment, we felt that MRI might prove to be a useful adjunct in the management of this condition. The objectives of this study were therefore to evaluate the effectiveness of MRI in the early diagnosis of AVN and to compare it to routine radiography, tomography, computerized tomography, and scintigraphy.
KeywordsFemoral Head Avascular Necrosis Tomography Plain Radio Frequency Signal Femoral Head Necrosis
Unable to display preview. Download preview PDF.
- 1.Axel L, Thickman D, Kressel HY, Weingrad T, Steinberg M, Chen H, Edelstein W (1984) NMR imaging of avascular necrosis. Magn Reson Med 1:93Google Scholar
- 2.Heller M, Moon KL, Helms CA, Schild H, Chafetz NI, Rodrigo J, Jergesen HE, Genant HK (1984) NMR imaging of femoral head necrosis. Magn Reson Med 1:163Google Scholar
- 3.Mitchell DG, Joseph PM, Fallon M, Hickey W, Kressel HY, Rao VM, Steinberg ME, Dalinka MK (1987) Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis. AJR 184:1159–1164Google Scholar
- 7.Mitchell MD, Kundel HL, Steinberg ME, Kressel HY, Alavi A, Axel L (1986) Avascular necrosis of the hip: comparison of MR, CT, and scintigraphy. AJR 174:67–71Google Scholar