Patellar instability

Case contributed by Dr Ayush Goel


Recurrent bilateral patellar dislocation

Patient Data

Age: 30
Gender: Female

Tibial tuberosity (TT) to Trochlear groove (TG) :

  • right knee TT-TG = 24.3mm
  • left knee TT-TG = 19.6mm


Case Discussion

Distance from tibial tuberosity to trochlear groove is one of the best measure for patellar instability.

TT - TG distance

  • normal : <15 mm
  • borderline : 15-20 mm
  • abnormal : >20 mm
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Case information

rID: 28749
Published: 10th Apr 2014
Last edited: 14th Mar 2016
Inclusion in quiz mode: Included

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