The angle formed by the line of traction of the quadriceps tendon on the patella and the line of traction of the patellar tendon on the tibial tubercle. The area is usually larger in women than in men.
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Women's knees have an extra Q-angle, and that has been shown to be a factor," McLaine says.
Static standing Q-angle was measured with a standard long-arm goniometer.
Univariate analysis for males indicated that low BMI, increased Q-angle, and poor gluteus medius strength were individually predictive of poor landing technique (higher LESS score).
Most importantly, BMI, navicular drop, Q-angle, and muscular strength do not significantly predict movement patterns in either male or female cadets.
Several factors have been proposed to cause patellofemoral pain syndrome such as patellar malalignment (Fredericson and Yoon 2006, Powers 2003), an increased Q-angle (Elias et al 2004, Fredericson and Yoon 2006, Mizuno et al 2001, Naslund et al 2006), quadriceps weakness (Fredericson and Yoon 2006, Thomee et al 1995), decreased flexibility of the lower extremity (Fredericson and Yoon 2006, Piva et al 2005), overuse (Thomee et al 1999), and muscle imbalance (Thomee et al 1995) which have all been shown to result in an increase in cartilage and subchondral bone stress (Fredericson and Yoon 2006).
The Q-angle is formed by the intersection of the line drawn form the anterior superior iliac spine to the midpoint of the patella and a proximal extension of the line drawn from the tibial tubercle to the midpoint of the patella.
According to Knees & Hips, the Q-angle, the angle formed at the knee where the slanting line of the femur (thigh) bone meets the vertical line from the kneecap to the ankles, is more pronounced in women than in men because women tend to have wider hips.
On physical examination, check for the quadriceps angle, or Q-angle, which is the angle created between a line drawn from the center of the anterior superior iliac spine on the pelvis to the center of the patella and a second line from the center of the patella to the middle of the tibial tubercle.
The greater the Q-angle, the more likely a patient is to have PFPS, according to some studies.
Although no concrete evidence indicates that the Q-angle plays a major role in ACL tears, evidence shows that it contributes to patellofemoral tracking problems and anterior knee pain.
In order to facilitate childbirth, women have a broad and round pelvis that results in a greater Q-angle from the pelvis to the knee.
This Q-angle causes women to start their step with a pronating heel strike," says Dr.