The Insall-Salvati Ratio is the ratio of the length of the patellar tendon to the length of the patella, when measured on an X-ray or MRI with the knees bent to 30 degrees.

 

Normal Insall-Salvati ratio

The normal ratio is 0.75 - 1.50. Higher ratios suggest that the patella is abnormally high.

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The patella - important anatomical relationships

The kneecap or patella is part of a chain of structures that help to straighten the knee.

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CLINICAL PUBLICATIONS

Evaluation of patella alta using MRI measurements in adolescents. Yılmaz B, Ozdemir G, Sirin E, Cicek ED, Anıl, BS and Bulbun G. Indian J Radiol Imaging. 2017 Apr-Jun; 27(2): 181–186.


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