Patella baja

Case contributed by Dr M Mourits


Pain after total knee replacement

Patient Data

Age: 80
Gender: Female

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 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

PlayAdd to Share

Case information

rID: 14496
Published: 1st Aug 2011
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

Updating… Please wait.

Alert accept

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

Alert accept Thank you for updating your details.