Quantitative assessment of the parameters determining habitual patella dislocation

In this paper a mathematical way of calculating the existing parameters on the basis of magnetic resonance images is introduced together with assessment of statistical significance in the analysis of patellar instability. 11 anthropometrical parameters were calculated, in various variants, using own methodology. Next, a statistical analysis was performed in order to evaluate their significance in patellar instability assessment. The most significant were Insal-Salvati ratio, trochlear depth, lateral tilt of the patella, lateralisation of tibial tuberosity, patellofemoral angle and sculus angle. The relation between patellar stability and the parameters selected as the most significant was studied with a computer simulation in the multi-body dynamics model.