Patella baja

Case contributed by Dr M Mourits

Presentation

Pain after total knee replacement

Patient Data

Age: 80
Gender: Female

Plain film knee

Modality: X-ray

Height from line to inferior edge of the patellar articular surface (PAS) : Length of PAS = 23.2:32.5= 0,71

Case Discussion

The Blackburne-Peel ratio is an alternative to Insall-Salvati ratio and is used to assess patellar height, and determine presence of patella baja or patella alta.

According to Blackburne and Peel: distance between horizontal line projected anteriorly of the tibial plateau and the height of the line to the inferior edge of the patellar articular surface (PAS). Length of PAS = <0,8 = patella baja, > 1,0= patella alta

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Case Information

rID: 14496
Case created: 1st Aug 2011
Last edited: 22nd Jul 2016
Inclusion in quiz mode: Included

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