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Insall-Salvatti and modified Insall-Salvati indices

Case contributed by Dr Wael Nemattalla

Case Discussion:

In 30 degree flexed knee:

Insall-Salvatti index:

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.

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