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. 2023 Jun 1;43(6):e220177. doi: 10.1148/rg.220177

Figure 19.

Effect of axial image orientation on the TT-TG measurement. The TT-TG (double-headed arrows) is sensitive to small changes in knee position and should be interpreted with caution if the orientation of the axial image acquisition is not standardized. For neutral orientation and accurate measurement, the axial imaging plane (black lines) is prescribed along the anatomic axial plane parallel to the knee joint (white dashed line). Abduction results in a significant increase in TT−TG, while adduction leads to a spurious decrease in TT−TG.

Effect of axial image orientation on the TT-TG measurement. The TT-TG (double-headed arrows) is sensitive to small changes in knee position and should be interpreted with caution if the orientation of the axial image acquisition is not standardized. For neutral orientation and accurate measurement, the axial imaging plane (black lines) is prescribed along the anatomic axial plane parallel to the knee joint (white dashed line). Abduction results in a significant increase in TT−TG, while adduction leads to a spurious decrease in TT−TG.