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"PATELLA BAJA"

“ Meaning ‘low patella’, associated with previous trauma, polio, juvenile chronic arthritis and achondroplasia. PLAIN FILM •   Insall-Salvat...

Meaning ‘low patella’, associated with previous trauma, polio, juvenile chronic arthritis and achondroplasia.
PLAIN FILM

•  Insall-Salvati ratio (tendon length/patella length): measured on lateral film (or sagittal reformat), ideally with the knee at 30° of flexion; ratio less thn 0.74 indicates ‘baja’ and >1.5 represents ‘alta’.