The correlation between Q-angle (clinical) and TTTGdistance (axial computed thomography) in Firuzgar Hospital, 2008

Background: The purpose of this study was to evaluate the significance of the Q angle with respect to the patella position. We assess the correlation between the Q angles (calculated by clinical exam) in different positions and CT indices (with more impression on TTTG) Method: Atotal number of 68 knee joints of 50 cases entered the study. Clinical examination was used to measure Q angle (in 3 positions of sitting, standing and supine). CT scan performed in 2 axial view of proximal tibia, and distal femor for measurement of Tibial tuberosity-trochlear groove distance (TTTG) and other CT indices. Correlation between main variables calculated.and analysed with spss. Results: Supine Q angle were strongly correlated with standing Q angles and moderately with sitting Q angle. Sitting Q angle was moderately correlated with supine and standing Q angle and weakly with PTA. we found no other significant correlation between Q angle and CT indexes. Discussion: Our findings suggest that Q angle is not a valuable index for predicting the presence of patelofemoral malalignment.