Blackburne-Peel Ratio: Difference between revisions
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The Blackburne-Peel ratio is used to assess | The Blackburne-Peel ratio is used to assess height, and determine presence of [[patella alta]]. A lateral radiograph of the knee with 30 degrees of flexion is obtained, and a horizontal line at the level of the tibial plateaux is drawn. Perpendicular to this line vertically and a measurement (B) made of the distance between the horizontal line and the inferior aspect of the patellar articular surface. A second measurement (A) is made along the [[patella]] articular surface. <ref>Syed A. Ali, Robert Helmer and Michael R. Terk; Patella Alta: Lack of Correlation Between Patellotrochlear Cartilage Congruence and Commonly Used Patellar Height Ratios; AJR November 2009 vol. 193 no. 5 1361-1366. (Level of evidence: B)</ref> <br>• A/B is a measure of patella height<br> Normal value = ratio of 0.8. <br> Patella alta = ratio >1.0 | ||
== References == | == References == | ||
Revision as of 16:28, 6 January 2019
The Blackburne-Peel ratio is used to assess height, and determine presence of patella alta. A lateral radiograph of the knee with 30 degrees of flexion is obtained, and a horizontal line at the level of the tibial plateaux is drawn. Perpendicular to this line vertically and a measurement (B) made of the distance between the horizontal line and the inferior aspect of the patellar articular surface. A second measurement (A) is made along the patella articular surface. [1]
• A/B is a measure of patella height
Normal value = ratio of 0.8.
Patella alta = ratio >1.0
References[edit | edit source]
- ↑ Syed A. Ali, Robert Helmer and Michael R. Terk; Patella Alta: Lack of Correlation Between Patellotrochlear Cartilage Congruence and Commonly Used Patellar Height Ratios; AJR November 2009 vol. 193 no. 5 1361-1366. (Level of evidence: B)
