Presentation
Recurrent patellar dislocation on the right side.
Patient Data
Age: 20 years
Gender: Female
From the case:
Patellar instability
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The tibial tuberosity (TT) to trochlear groove (TG) distance of the right knee is measuring about 21.1 mm.
Case Discussion
Distance from tibial tuberosity to trochlear groove (TT-TG) is one of the best measures for patellar instability.
Range:
- normal : <15 mm
- borderline : 15-20 mm
- abnormal : >20 mm
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