Dr. Ebraheim’s educational animated video describes excessive Q - angle of the knee.
A well-functioning knee joint is important for mobility. The knee must be able to support the weight of the body during activities such as walking or running.
What is Q-angle? The Q-angle is the angle between the quadriceps tendon and the patellar tendon. An increased Q-angle is a risk factor for patellar subluxation.
How do we measure the Q-angle?
•Find the patella and its border
•Find the center of the patella
•Find the tibial tubercle
•Draw a line from the ASIS to the center of the patella and a second line from the tibial tubercle through the center of the patella.
The Q-angle (quadriceps angle) is formed in the frontal plane by the two line segments. The Q_angle is the angle formed by a line drawn from the anterior superior iliac spine (ASIS) to the center of the patella. A second line is drawn from the center of the patella to the tibial tubercle. The angle formed by the two lines is called the Q-angle.
The normal Q-angle is variable. The normal Q-angle for males is usually 14 degrees and 17 degrees in females. A wider pelvis and an increased Q-angle in females are linked to knee pain, patellofemoral pain, and ACL injury. The alignment of the patellofemoral joint is affected by the patellar tendon length and the Q-angle. It is best to measure the Q_angle with the knee in extension as well as flexion. Larger Q_angle plus a strong quadriceps contraction can dislocate the patella. The Q-angle is increased by :
•Genu valgum
•External tibial torsion
•Femoral anteversion
•Lateral positioned tibial tuberosity
•Tight lateral retinaculum.
CT scan study of the patellofemoral articulation is found to be very helpful.
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