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Reference points, lines, and planes
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Cs
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The highest point of the condyle in the sagittal view
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GI
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Point of greatest concavity of the glenoid fossa
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Cp
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Most convex point on the posterior face of the condyle
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PI
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Line perpendicular to the Frankfurt plane passing through the midpoint of the sagittal diameter of the external auditory canal
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Ca
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Point on the anterior wall of the condyle closest to the posterior wall of the articular eminence
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EI
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Point on the posterior wall of the articular eminence closest to the anterior wall of the condyle
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E-E′
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Line tangential to the posterior wall of the articular eminence
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Fh′
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Line parallel to the Frankfurt plane passing through the lower edge of the articular eminence
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Distancesa
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Cs-GI
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Upper distance from the highest part of the condyle to the deepest part of the glenoid fossa
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Cp-PI
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Posterior distance from the most convex part of the posterior wall of the condyle to line PI
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Ca-EI
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Anterior distance joining the most convex point on the anterior wall of the condyle with point EI
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E-E′.Fh′
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Angle between the tangent passing through the posterior wall of the articular eminence and the Fh′ plane parallel to the Frankfurt plane
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GI-Fh
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Height of the eminence from the deepest part of the glenoid fossa to the Fh′ plane parallel to the Frankfurt plane
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