Blackburne-Peel Ratio: Difference between revisions
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<div class="editorbox"> '''Original Editor '''- [[User:Fitim Cami|Fitim Cami]] '''Top Contributors''' - {{Special:Contributors/{{FULLPAGENAME}}}}</div> | |||
== Introduction == | |||
[[Patella alta]] or high riding patella is a risk factor for patellar instability and pain.<ref name=":0">Verhulst FV, van Sambeeck JD, Olthuis GS, van der Ree J, Koëter S. Patellar height measurements: Insall–Salvati ratio is most reliable method. Knee Surgery, Sports Traumatology, Arthroscopy. 2020 Mar;28(3):869-75.</ref> | |||
Many imaging modalities are used to measure the height of the patella including Blackburne-Peel ratio, [[Insall-Salvati Ratio|Insall-Salvati ratio]], the Caton-Deschamps ratio, [[Insall-Salvati Ratio|modified Insall-Salvati ratio]] and patellotrochlear index. <ref name=":0" /> | |||
== Method == | |||
Blackburne-Peel ratio compares the distance of the articular cartilage surface of the patella to a line drawn from the tibial plateau to the inferior pole of patella. <ref>Wolfe S, Varacallo M, Kahwaji CI. [https://www.ncbi.nlm.nih.gov/books/NBK482427/ Patellar Instability.]</ref> | |||
Steps: | |||
* A lateral radiograph of the knee with 30 degrees of flexion is obtained, and a horizontal line at the level of the tibial plateau is drawn. | |||
* Measurement (B): a perpendicular line is drawn vertically from the horizontal line of the tibial plateau to the inferior aspect of the patellar articular surface. | |||
* Measurement (A): a line is made along the [[patella]] articular surface. | |||
* A/B is a measure of patella height<br> Normal value = ratio of 0.8. <br> Patella alta = ratio >1.0 <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> | |||
== Evidence == | |||
Seil et al and Berg et al, found Blackburne-Peel ratio to be most reliable on computed radiography. | |||
To fully assess the patellofemoral anatomic morphology using the Blackburne-Peel ratio both conventional radiographs and a scan should be done.<ref name=":0" /> | |||
{{#ev:youtube|AwRvpRoW77E}} | |||
== References == | == References == | ||
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[[Category:Knee]] | [[Category:Knee]] | ||
[[Category:Assessment]] | |||
[[Category:Knee - Assessment and Examination]] | |||
Latest revision as of 17:21, 21 September 2020
Original Editor - Fitim Cami Top Contributors - Kim Jackson, Lilian Ashraf, Admin, Fitim Cami and Daphne Jackson
Introduction[edit | edit source]
Patella alta or high riding patella is a risk factor for patellar instability and pain.[1]
Many imaging modalities are used to measure the height of the patella including Blackburne-Peel ratio, Insall-Salvati ratio, the Caton-Deschamps ratio, modified Insall-Salvati ratio and patellotrochlear index. [1]
Method[edit | edit source]
Blackburne-Peel ratio compares the distance of the articular cartilage surface of the patella to a line drawn from the tibial plateau to the inferior pole of patella. [2]
Steps:
- A lateral radiograph of the knee with 30 degrees of flexion is obtained, and a horizontal line at the level of the tibial plateau is drawn.
- Measurement (B): a perpendicular line is drawn vertically from the horizontal line of the tibial plateau to the inferior aspect of the patellar articular surface.
- Measurement (A): a line is made along the patella articular surface.
- A/B is a measure of patella height
Normal value = ratio of 0.8.
Patella alta = ratio >1.0 [3]
Evidence[edit | edit source]
Seil et al and Berg et al, found Blackburne-Peel ratio to be most reliable on computed radiography.
To fully assess the patellofemoral anatomic morphology using the Blackburne-Peel ratio both conventional radiographs and a scan should be done.[1]
References[edit | edit source]
- ↑ 1.0 1.1 1.2 Verhulst FV, van Sambeeck JD, Olthuis GS, van der Ree J, Koëter S. Patellar height measurements: Insall–Salvati ratio is most reliable method. Knee Surgery, Sports Traumatology, Arthroscopy. 2020 Mar;28(3):869-75.
- ↑ Wolfe S, Varacallo M, Kahwaji CI. Patellar Instability.
- ↑ 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)
