Which statement correctly describes the STJ axis orientation in the transverse plane?

Which statement correctly describes the STJ axis orientation in the transverse plane?

• A. The axis is 42 degrees in the transverse plane.
• B. The axis is 42 degrees in the sagittal plane.
• C. It is 16 degrees medial in the sagittal plane.
• D. It is 16 degrees lateral in the sagittal plane.

Answer: (A)

The subtalar joint axis is not aligned with the major body planes; its orientation is oblique, and its most commonly described measure is in the transverse plane. In that view, the axis sits about 42 degrees from the sagittal plane, meaning it runs from posteromedial to anterolateral as you look down on the foot. This 42-degree transverse-plane orientation is the standard descriptor for how the subtalar joint axis sits relative to the planes of the foot. The other statements place an angle in the sagittal plane (or describe medial/lateral direction in that plane), which does not match the typical transverse-plane description of the STJ axis.

The subtalar joint axis is not aligned with the major body planes; its orientation is oblique, and its most commonly described measure is in the transverse plane. In that view, the axis sits about 42 degrees from the sagittal plane, meaning it runs from posteromedial to anterolateral as you look down on the foot. This 42-degree transverse-plane orientation is the standard descriptor for how the subtalar joint axis sits relative to the planes of the foot.

The other statements place an angle in the sagittal plane (or describe medial/lateral direction in that plane), which does not match the typical transverse-plane description of the STJ axis.