Jörg Dickschas1, Jörg Harrer2, Thomas Bayer3, Judith Schwitulla4,5, Wolf Strecker6. 1. Klinik für Orthopädie und Unfallchirurgie, Klinikum Bamberg, Buger Strasse 80, 96049, Bamberg, Germany. Joerg.dickschas@sozialstiftung-bamberg.de. 2. Klinik für Orthopädie und Unfallchirurgie, Klinikum Bamberg, Buger Strasse 80, 96049, Bamberg, Germany. joerg.harrer@sozialstiftung-bamberg.de. 3. Radiologisches Institut, Universitätsklinikum Erlangen, Maximiliansplatz 1, 91054, Erlangen, Germany. thomas.bayer@uk-erlangen.de. 4. Institut für Medizininformatik, Biometrie und Epidemiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstr. 6, 91054, Erlangen, Germany. judith.schwitulla@fau.de. 5. , Universitätsstr. 22, 91052, Erlangen, Germany. judith.schwitulla@fau.de. 6. Klinik für Orthopädie und Unfallchirurgie, Klinikum Bamberg, Buger Strasse 80, 96049, Bamberg, Germany. wolf.strecker@sozialstiftung-bamberg.de.
Abstract
PURPOSE: 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? METHODS: 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. RESULTS: 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. CONCLUSION: 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. LEVEL OF EVIDENCE: Diagnostic study, Level III.
PURPOSE: 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? METHODS: 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. RESULTS: 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. CONCLUSION: 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. LEVEL OF EVIDENCE: Diagnostic study, Level III.
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