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Insall-Salvati and modified Insall-Salvati indices

Case contributed by Dr Wael Nemattalla

Insall-Salvati index: red line/yellow line

Modified Insall-Salvati index: red line/yellow line

Case Discussion:

In 30 degree flexed knee:

  • Insall-Salvati index: normal mean is 1; ratio >1.2 is diagnostic of patella alta and <0.8 is diagnostic of patella baja.
  • modified Insall-Salvati index: normal mean of 1.25; ratio >2 is diagnostic of patella alta

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