Evaluating the Correlation Between Several Patellar Measurements and Patient’s Height and Weight: Matched Case-control Study
2Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
Objective:
Tibial tubercle-trochlear groove distance (TT-TG) and Insall-Salvati ratio (IS) was recently suggested to be associated with patient’s height and weight. We aimed to investigate the variation of TT-TG and IS measurements as a function of patient’s height and weight on sagittal MRI while employing case-control matching analysis for age and gender to maximize confounder control.
Methods:
A retrospective case-control population-based study was performed of all MRI studies of patients diagnosed with lateral patellar dislocation, between 2005-2020 at a regional tertiary medical center.
Using 1:1 case-control matching for categories of gender and age at the time of the diagnosis, one control subject was assigned to each case of lateral patellar dislocation. The study included 340 individuals (170 case-control matched pairs).
Measurements of tibial tubercle-trochlear groove distance and Insall-Salvati ratio were conducted using the picture archiving and communication system (PACS).
Correlation coefficients were calculated to evaluate the significance and amplitude of each measurement as a function of patient’s height and weight.
Results:
Both TT-TG and IS measurement were found to be significantly higher in the patellar dislocation (PD) group compared to the control group (14.5 ± 4.45 vs 10.83 ± 4.4, p0.05).
Conclusion:
Patient’s height and weight per se does not appear to impact both TT-TG and IS measurements, while employing case-control matching analysis for age and gender to minimize confounders effect.