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Patellar Instability: Assessment on MR Images by Measuring the Lateral Trochlear Inclination-Initial Experience¹

¹ From the Departments of Radiology (Y.C., O.F., V.A.T.M.), Medical Statistics (H.A.), and Orthopedics (D.D., B.M.), Centre Hospitalier Lyon-Sud, Chemin du grand Revoyet, 69495 Pierre Bénite Cedex, France. Received June 22, 1999; revision requested August 10; final revision received November 9; accepted November 22. Address correspondence to Y.C. (e-mail: carrillon@grisn.univ-lyon1.fr).

Lateral trochlear inclination (LTI) of the knee was compared on magnetic resonance (MR) images obtained in 30 patients with patellar instability (PI) and 30 patients with nonspecific internal knee derangement. Differences in LTI values between the two populations were significant (P < .001). Reproducibility of the measurement was judged excellent with an intraclass correlation superior to 0.98. Below a threshold value fixed at 11°, LTI appears to be an excellent diagnostic test of PI with a sensitivity of 0.93 (28/30), a specificity of 0.87 (26/30), and an accuracy of 0.90 (54/60).

Index terms: Joints, abnormalities, 452.42 • Knee, abnormalities, 452.42, 452.43, 453.42, 453.43 • Knee, MR, 452.121415, 453.121415 • Patella, 453.42, 453.43

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