Insall-Salvatti and modified Insall-Salvati indices
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In 30 degree flexed knee:
Normal mean is 1.
Ratio More than 1.2 is diagnostic of patella alta and below 0.8 is diagnostic of patella baja.
Modified Insall-Salvatti index:
Normal mean of 1.25. Ratio More than 2 is diagnostic of patella alta.