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American Journal of Roentgenology, Vol 166, 1057-1060, Copyright © 1996 by American Roentgen Ray Society

ARTICLES

Articular muscle of the knee: a muscle seldom recognized on MR imaging

S Puig, DE Dupuy, A Sarmiento, GW Boland, P Grigoris and R Greene
Universitatsklinik fur Radiodiagnostik, Vienna, Austria.

OBJECTIVE: We studied the MR imaging characteristics of the articular muscle of the knee, an important but seldom recognized structure of the distal thigh and knee. SUBJECTS AND METHODS: We used a 1.5-T system to prospectively evaluate the articular muscle of the knee in five healthy volunteers (10 knees); then we retrospectively studied the knee examinations of 24 patients (30 knees). One reader made duplicate readings to prospectively assess the sagittal proton density-weighted and axial T1-weighted images of the healthy volunteers. Three independent readers retrospectively evaluated the sagittal proton density-weighted images of the 24 patients. RESULTS: The articular muscle of the knee was identified in 100% of prospective studies (10/10) and in 83% of retrospective studies (25/30). For the prospective study group, measurements (mean +/- SEM) were as follows: number of bundles, 2.4 +/- 0.68 (range, 1-4); length of uppermost bundle, 47.2 +/- 4.06 mm; width of origin, 8.6 +/- 0.79 mm; angle of origin, 11.4 degree +/- 1.29 degree; and cross-sectional bundle width, 19.8 +/- 2.05 mm2. CONCLUSION: The articular muscle of the knee can usually be identified by MR imaging as an independent entity, separate from the great (vastus) muscle group.
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Copyright © 1996 by the American Roentgen Ray Society.