Q angle
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The Q angle (quadriceps angle) is measured between two intersecting lines with the knee in 25° of flexion 1:
- anterior superior iliac spine to centre of the patella
- central of the patella to the tibial tuberosity
A Q angle of <15° is considered normal, and >20-25° abnormal 2,4 and as the Q angle increases there is increasing lateral force on the patella from the quadriceps muscles contributing to lateral patellar translation 2. However, TT-TG distance (which is the linear equivalent of the Q angle) has been shown to be a more reliable measure of patellofemoral instability 2,3.
-<p>The <strong>Q angle</strong> is measured between two intersecting lines with the knee in 25° of flexion <sup>1</sup>:</p><ul>- +<p>The <strong>Q angle</strong> (<strong>quadriceps angle</strong>) is measured between two intersecting lines with the knee in 25° of flexion <sup>1</sup>:</p><ul>
-<a title="Anterior superior iliac spine" href="/articles/anterior-superior-iliac-spine">anterior superior iliac spine</a> to centre of the <a title="Patella" href="/articles/patella">patella</a>- +<a href="/articles/anterior-superior-iliac-spine">anterior superior iliac spine</a> to centre of the <a href="/articles/patella">patella</a>
-</ul><p>A Q angle of <15° is considered normal, and >20-25° abnormal <sup>2,4</sup> and as the Q angle increases there is increasing lateral force on the patella from the quadriceps muscles contributing to lateral patellar translation <sup>2</sup>. However, <a title="Patellar translation (TT-TG distance)" href="/articles/patellar-translation-tt-tg-distance">TT-TG distance</a> (which is the linear equivalent of the Q angle) has been shown to be a more reliable measure of <a title="Patellofemoral instability" href="/articles/patellofemoral-instability">patellofemoral instability</a> <sup>2,3</sup>. </p>- +</ul><p>A Q angle of <15° is considered normal, and >20-25° abnormal <sup>2,4</sup> and as the Q angle increases there is increasing lateral force on the patella from the quadriceps muscles contributing to lateral patellar translation <sup>2</sup>. However, <a href="/articles/patellar-translation-tt-tg-distance">TT-TG distance</a> (which is the linear equivalent of the Q angle) has been shown to be a more reliable measure of <a href="/articles/patellofemoral-instability">patellofemoral instability</a> <sup>2,3</sup>. </p>
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