Patellar instability in Indian population: relevance of tibial tuberosity and trochlear groove distance.

Introduction: The tibial tuberosity to trochlear groove (TTTG) distance in the western population is extensively studied through various modalities such as X-rays, computerised tomography and magnetic resonance imaging. However, to our knowledge there is very little or no literature support to indicate that TTTG distance has been studied in the Indian population.

Methods: We therefore undertook a study to measure the TTTG distance in 100 MRI scans of normal Indian knees.