Knee
Patellar nose
Ratio
>0.25
Radiography (Lateral)
Magnetic resonance imaging
a : lenght of patellar nose
b : lenght of patella
Patellar nose ratio = a / b
Reference
Escala JS, Mellado JM, Olona M et-al. Objective patellar instability: MR-based quantitative assessment of potentially associated anatomical features. Knee Surg Sports Traumatol Arthrosc. 2006;14 (3): 264-72.
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