Blackburne-Peel ratio
Citation, DOI, disclosures and article data
At the time the article was created Frank Gaillard had no recorded disclosures.
View Frank Gaillard's current disclosuresAt the time the article was last revised Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresThe Blackburne-Peel ratio is an alternative to Insall-Salvati ratio and is used to assess patellar height including patella alta and baja.
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Usage
The Blackburne-Peel ratio has higher interobserver reliability compared to the Insall-Salvati ratio and can also be used when the tibial tuberosity is abnormal (e.g. Osgood-Schlatter disease, osteotomy) as it does not rely on this landmark 3,4.
Measurement
A lateral radiograph of the knee with 30° of flexion is obtained, and a horizontal line at the level of the tibial plateau is drawn. Perpendicular to this line (i.e. vertically) two measurements are made:
- A: along the patellar articular surface
- B: distance between the horizontal line and the inferior aspect of the patellar articular surface
B/A is a measure of patellar height
Interpretation
- patella baja: <0.5
- normal: 0.8
- patella alta: >1.0
References
- 1. Blackburne JS, Peel TE. A new method of measuring patellar height. J Bone Joint Surg Br. 1977;59 (2): 241-2. Pubmed citation
- 2. Anagnostakos K, Lorbach O, Reiter S et-al. Comparison of five patellar height measurement methods in 90° knee flexion. Int Orthop. 2011;35 (12): 1791-7. doi:10.1007/s00264-011-1236-4 - Free text at pubmed - Pubmed citation
- 3. Alexander Meininger. Understanding the Patellofemoral Joint: From Instability to Arthroplasty; An Issue of Clinics in Sports Medicine. (2014) ISBN: 9780323320740
- 4. W. Norman Scott. Insall & Scott Surgery of the Knee E-Book. (2011) ISBN: 9781455727896
Incoming Links
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