Q angle

Q Angle or Quadriceps Angle is an important measurement in the field of orthopedics and sports medicine that helps in assessing the alignment of the knee joint. It is defined as the angle formed by a line drawn from the anterior superior iliac spine (ASIS) to the center of the patella and a second line drawn from the center of the patella to the tibial tuberosity. This angle is crucial in understanding the biomechanics of the knee and is often used in diagnosing patellar tracking disorders such as patellofemoral pain syndrome.

Measurement

The Q angle is measured with the patient in a supine (lying on the back) position with the knee extended. The measurement can be affected by the position of the foot and whether the measurement is taken actively (with the patient's muscles contracted) or passively. A normal Q angle is typically between 10 to 20 degrees for men and 15 to 25 degrees for women, reflecting the wider pelvis in females.

Clinical Significance

An increased Q angle is associated with a higher risk of knee injuries, as it may indicate abnormal patellar tracking. Conditions such as patellar subluxation, chondromalacia patellae, and anterior knee pain are often related to an increased Q angle. Conversely, a decreased Q angle, though less common, can also lead to biomechanical issues.

Treatment and Management

Management of conditions related to an abnormal Q angle often involves physical therapy aimed at strengthening the quadriceps muscle, particularly the vastus medialis oblique (VMO), to improve patellar tracking. Orthotic devices may also be used to correct underlying biomechanical issues contributing to an abnormal Q angle.

See Also

• Knee pain
• Patellofemoral pain syndrome
• Orthopedic surgery
• Sports medicine

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