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Recognition of Cranio-Cervical Instability in the Complex Chiari ...

Recognition of Cranio-Cervical Instability in the Complex Chiari ...

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¡ A l<strong>in</strong>e drawn along <strong>the</strong> hard<br />

palate, <strong>in</strong>tersect<strong>in</strong>g a l<strong>in</strong>e<br />

along <strong>the</strong> Atlas <strong>in</strong> <strong>the</strong><br />

neutral position<br />

b >13° reflects basilar<br />

<strong>in</strong>vag<strong>in</strong>ation<br />

¡ But does not account for<br />

variability between flexion<br />

extension, nor recognize<br />

differential development <strong>of</strong><br />

face and sp<strong>in</strong>e<br />

Bull, Nixon and Pratt, Bra<strong>in</strong> 78:<br />

229-­‐247, 1955.The radiological<br />

criteria and familial occurrence <strong>of</strong><br />

primary basilar <strong>in</strong>vag<strong>in</strong>ation<br />

b

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