Presentation
Recurrent bilateral patellar dislocation.
Patient Data
Age: 30 years
Gender: Female
From the case:
Patellar instability
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Tibial tuberosity (TT) to trochlear groove (TG) distances:
right knee TT-TG = 24.3mm
left knee TT-TG = 19.6mm
Case Discussion
Distance from tibial tuberosity to trochlear groove (TT-TG) is one of the best measure for patellar instability.
Range:
- normal : <15 mm
- borderline : 15-20 mm
- abnormal : >20 mm