Modified Insall-Salvati ratio
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The modified Insall-Salvati ratio is or index is another technique to assess patellar height.
Measurement
The modified Insall-Salvati ratio is applied on a lateral 30° flexed knee radiograph like the Insall-Salvati ratio but is measured differently:
- A: distance from the inferior margin of the patellar articular surface (as opposed to the lower pole of the patella itself) to the patellar tendon insertion
- B: length of the patellar articular surface
Modified Insall-Salvati ratio = A/B
Interpretation
- normal around 1.25
- patella alta when >2
-<p>The <strong>modified Insall-Salvati ratio</strong> is another technique to assess <a title="patellar height" href="/articles/patellar-height">patellar height</a>. </p><h4>Measurement</h4><p>The <strong>modified Insall-Salvati ratio</strong> is applied on a lateral 30° flexed <a href="/articles/knee-x-ray-summary">knee radiograph</a> like the Insall-Salvati ratio but is measured differently:</p><ul>- +<p>The <strong>modified Insall-Salvati ratio</strong> or <strong>index</strong> is another technique to assess <a href="/articles/patellar-height">patellar height</a>. </p><h4>Measurement</h4><p>The <strong>modified Insall-Salvati ratio</strong> is applied on a lateral 30° flexed <a href="/articles/knee-x-ray-summary">knee radiograph</a> like the Insall-Salvati ratio but is measured differently:</p><ul>
-<li>patella alta when >2</li>- +<li>
- +<a title="Patella alta" href="/articles/patella-alta">patella alta</a> when >2</li>
References changed:
- 1. Grelsamer RP, Meadows S. The modified Insall-Salvati ratio for assessment of patellar height. Clin. Orthop. Relat. Res. 1992; (282): 170-6. <a href="http://www.ncbi.nlm.nih.gov/pubmed/1516309">Pubmed citation</a><span class="auto"></span>
Tags changed:
- knee
Systems changed:
- Musculoskeletal
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Modified Insall-Salvati index
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Modified Insall-Salvatti index
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