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  • Title: Postero-anterior radiogram of the knee in weight-bearing and semiflexion. Comparison with MR imaging.
    Author: Boegård T, Rudling O, Petersson IF, Sanfridsson J, Saxne T, Svensson B, Jonsson K.
    Journal: Acta Radiol; 1997 Nov; 38(6):1063-70. PubMed ID: 9394671.
    Abstract:
    PURPOSE: The purpose was four-fold: to assess the reproducibility of p.a. weight-bearing radiograms of the knee and the minimal joint-space (MJS) width measurements in these radiograms; to compare the MJS with MR-detected cartilage defects; to evaluate the location of these cartilage defects; and to estimate the relation between meniscal abnormalities and joint-space narrowing. MATERIAL AND METHODS: Fifty-nine individuals, aged 41-58 years (mean 50), with chronic knee pain were examined by means of p.a. weight-bearing radiograms in semiflexion with fluoroscopic guidance of the knee joint. The MJS was measured with a standard ruler. On the same day MR imaging was performed with proton-density- and T2-weighted turbo spin-echo on a 1.0 T imager. Meniscal abnormalities and cartilage defects in the tibiofemoral joint (TFJ) were noted. RESULTS AND CONCLUSION: The p.a. view of the knee and the MJS measurements were reproducible. MJS of 3 mm is a limit in diagnosing joint-space narrowing in knees with MR-detected cartilage defects. There was a high proportion (p < 0.001) of meniscal abnormality within the narrowed compartments in comparison with those that were not narrowed. A larger number of the cartilage defects (p < 0.05) was found in the medial femoral condyle than in any of the other condyles of the TFJ. The defects had a dorsal location (p < 0.001) as shown in the weight-bearing radiograms of the knee in semiflexion.
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