Ruth Jackson's Angle is also known as Cervical Stress Lines, which is measured by constructing lines of mensuration from the posterior bodies of C-2 and C-7. These lines will form an angle which ordinarily intersect at the C4-C5 disc interspace in the neutral and extension view and C5-C6 disc interspace in flexion. The intersection point represents the focus of stress when the cervical spine is placed in the respective position. Muscle spasms, joint fixation, and disc degeneration may alter the stress point.

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