All rotational movements occurring in the sagittal plane use which notation?

Rotational movements occurring in the sagittal plane are denoted using the notation associated with the X-axis, which is indicated as ±θX. The sagittal plane divides the body into left and right halves, and the rotations that occur in this plane are primarily flexion and extension movements.

In biomechanics, the X-axis typically corresponds to the axis around which these movements occur. For example, when you perform a forward or backward bend, you are rotating around this axis. The notation ±θX effectively conveys the direction of rotation relative to the X-axis, allowing practitioners to analyze and communicate movements accurately.

Understanding this notation is essential for accurately describing movements in clinical practice, especially when assessing joint function or planning rehabilitation protocols. The other options relate to different types of movements or different planes and axes. Thus, recognizing that sagittal plane movements are specifically associated with the X-axis notation is key in the study of clinical biomechanics.