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. 2019 May 26;37(9):1892–1902. doi: 10.1002/jor.24336

Figure 7.

Figure 7

(A) 3D orientation of the STJ axis relative to the hindfoot. α and β are the angles from the coronal and transverse planes to the STJ axis, respectively. (B) Assuming that the lateral tuberosity of the calcaneus is constant, changes in the talar head/neck (e.g., Point 1 vs. Point 2) can lead to a different orientation of the STJ axis. (C) A similar configuration. This time, it is assumed that the talar head/neck is constant and that the lateral tuberosity of the calcaneus changes. (D) An analogy can be made to a gear mechanism. If the STJ axis passes at 45° (α = β), the rotations around the vertical axis and the horizontal axis are equal to each other. If the STJ axis is vertically aligned (i.e., β > α), the rotation around the horizontal axis is less than the one around the vertical axis. In the cases where β < α (horizontal alignment of the STJ axis), it is the other way around. 3D, three dimensional; HM, horizontal motion; STJ, subtalar joint; VM, vertical motion. [Color figure can be viewed at wileyonlinelibrary.com].