Patella baja

Case contributed by Dr M Mourits

Presentation

Pain after total knee replacement

Patient Data

Age: 80 years
Gender: Female
X-ray

Plain film knee

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 the presence of patella baja or patella alta.

According to Blackburne and Peel: the 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 indicates patella baja, >1.0  patella alta

PlayAdd to Share

Case information

rID: 14496
Published: 1st Aug 2011
Last edited: 6th Apr 2020
Inclusion in quiz mode: Included

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.