Correlation of the tibial tuberosity-trochlear groove distance with the Q-angle

Journal article

Publication Details

Author(s): Dickschas J, Harrer J, Bayer T, Schwitulla J, Strecker W
Journal: Knee Surgery Sports Traumatology Arthroscopy
Publication year: 2016
Volume: 24
Journal issue: 3
Pages range: 915-20
ISSN: 0942-2056


The Q-angle has been used for years to quantify lateralization of the patella. The tibial tuberosity-trochlea groove distance (TT-TG distance) was introduced to analyse patellar tracking. Does a significant correlation exist between these two parameters? Do other significant interrelations exist between the Q-angle/TT-TG distance, torsion of the femur and tibia, the frontal axis, overall leg length, gender, former patellar dislocation, BMI?One hundred knees in 55 patients with patellofemoral symptoms were included in a prospective study. All patients underwent clinical examination, including measurement of the Q-angle. A torsional CT was obtained from all patients.The correlation coefficient was 0.33/0.34 (left/right leg), showing that the TT-TG distance tends to rise in direct ratio to a rising Q-angle. Thus, a significant correlation was found (p = 0.017). Femoral and tibial torsion had a positive effect on the TT-TG distance, but showed no significant correlation. Leg length had a significant effect on the TT-TG distance (p = 0.04). The frontal axis had a nonsignificant influence on the Q-angle or TT-TG distance. On average, the Q-angle in women was 2.38° greater than it was in men, but the difference was not significant.A significant correlation was noted between the Q-angle and the TT-TG distance. Both depend on various parameters and must be assessed for the analysis of patellofemoral maltracking. The Q-angle did not differ significantly between men and women; thus, the conclusion is that no different ranges need not be used.Diagnostic study, Level III.

FAU Authors / FAU Editors

Schwitulla, Judith

External institutions with authors

Klinikum Bamberg

How to cite

Dickschas, J., Harrer, J., Bayer, T., Schwitulla, J., & Strecker, W. (2016). Correlation of the tibial tuberosity-trochlear groove distance with the Q-angle. Knee Surgery Sports Traumatology Arthroscopy, 24(3), 915-20.

Dickschas, Joerg, et al. "Correlation of the tibial tuberosity-trochlear groove distance with the Q-angle." Knee Surgery Sports Traumatology Arthroscopy 24.3 (2016): 915-20.


Last updated on 2018-09-10 at 02:17