Patellar instability: assessment on MR images by measuring the lateral trochlear inclination-initial experience.
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 degrees, 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).
Departments of Radiology, Centre Hospitalier Lyon-Sud, Chemin du grand Revoyet, 69495 Pierre Bénite Cedex, France. carrillon@grisn.univ-lyon1.fr
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D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D000070598:Anterior Cruciate Ligament Injuries; D001847:Bone Diseases / Q000175:diagnosis; D016022:Case-Control Studies; D005189:False Positive Reactions; D005240:Feasibility Studies; D005260:Female; D005269:Femur / Q000473:pathology*; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis; D004204:Joint Dislocations / Q000175:diagnosis; D007593:Joint Instability / Q000175:diagnosis*; D007719:Knee Joint / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D015588:Observer Variation; D010329:Patella / Q000473:pathology*; D012372:ROC Curve; D012044:Regression Analysis; D015203:Reproducibility of Results; D012421:Rupture; D012680:Sensitivity and Specificity; D000070600:Tibial Meniscus Injuries