Beta angle (developmental dysplasia of the hip)
Updates to Article Attributes
The beta angle is a measurement used used in the ultrasonographic assessment of developmental dysplasia of the hip (DDH).
It is defined as the angle formed between the vertical cortex of the ilium and the triangular labral fibrocartilage (echogenic triangle) and thus reflects the femoral head cartilaginous coverage. There is a great deal of variability in the beta angle (much more than the alpha angle), and as such, it is not universally used.
In some instances the, the beta angle is necessary necessary to determine the the subtype of hip dysplasia (e.g. type Ia vs. Ib, or type IIc vs. type D - see the sonographic classification of developmental dysplasia of the hip (DDH)). The cut cut off beta angle depends on the type.
History and etymology
BothR Graf originally described both the beta angle and the alpha angle were originally described by R Graf
See also
-<p>The <strong>beta angle </strong>is a measurement used in ultrasonographic assessment of <a href="/articles/developmental-dysplasia-of-hip-ddh">developmental dysplasia of hip (DDH)</a>.</p><p>It is defined as the angle formed between the vertical cortex of the <a href="/articles/ilium">ilium</a> and the triangular labral fibrocartilage (echogenic triangle). There is a great deal of variability in the beta angle (much more than the <a href="/articles/alpha-angle-ddh-1">alpha angle</a>), and as such it is not universally used. </p><p>In some instances the beta angle is necessary to determine the subtype of hip dysplasia (e.g. type Ia vs Ib, or type IIc vs type D - see <a href="/articles/ultrasound-classification-of-developmental-dysplasia-of-the-hip-ddh">sonographic classification of developmental dysplasia of the hip (DDH)</a>). The cut off beta angle depends on the type. </p><h4>History and etymology</h4><p>Both the beta angle and the alpha angle were originally described by <strong>R Graf</strong> in 1980 <sup>1</sup>. </p><h4>See also</h4><ul>-<li><a href="/articles/ultrasound-classification-of-developmental-dysplasia-of-the-hip-ddh">sonographic classification of developmental dysplasia of the hip (DDH)</a></li>-<li><a href="/articles/alpha-angle-ddh-1">alpha angle</a></li>- +<p>The <strong>beta angle </strong>is a measurement used in the ultrasonographic assessment of <a title="Developmental dysplasia of the hip (DDH)" href="/articles/developmental-dysplasia-of-the-hip">developmental dysplasia of the hip (DDH)</a>.</p><p>It is defined as the angle formed between the vertical cortex of the <a href="/articles/ilium">ilium</a> and the triangular labral fibrocartilage (echogenic triangle) and thus reflects the femoral head cartilaginous coverage. There is a great deal of variability in the beta angle (much more than the <a href="/articles/alpha-angle-developmental-dysplasia-of-the-hip">alpha angle</a>), and as such, it is not universally used. </p><p>In some instances, the beta angle is necessary to determine the subtype of hip dysplasia (e.g. type Ia vs. Ib, or type IIc vs. type D - see the <a href="/articles/graf-method-for-ultrasound-classification-of-developmental-dysplasia-of-the-hip">sonographic classification of developmental dysplasia of the hip (DDH)</a>). The cut off beta angle depends on the type. </p><h4>History and etymology</h4><p>R Graf originally described both the beta angle and the alpha angle in 1980 <sup>1</sup>. </p><h4>See also</h4><ul>
- +<li><a href="/articles/graf-method-for-ultrasound-classification-of-developmental-dysplasia-of-the-hip">sonographic classification of developmental dysplasia of the hip (DDH)</a></li>
- +<li><a href="/articles/alpha-angle-developmental-dysplasia-of-the-hip">alpha angle</a></li>