> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uplift.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# T-Spine Rotation

> Biomechanical analysis of thoracic spine rotation range of motion assessment with compensation detection.

## Overview

T-spine rotation assessment evaluates the range of motion and quality of movement in the thoracic spine during rotation. This assessment provides valuable information about thoracic spine mobility and function.

## Instructions

Kneel or sit upright to minimize lumbar contribution. Cross arms over the chest or place hands behind the head. Rotate the upper body to one side as far as possible, keeping the pelvis stationary and facing forward. Hold briefly at maximum rotation, then return to center. Repeat on the opposite side.

## Example Videos

### Left

<Frame>
  <video controls src="https://uplift-docs-assets.s3.amazonaws.com/range_of_motion/range_of_motion-t_spine_rotation-left_combined.mp4" />
</Frame>

### Right

<Frame>
  <video controls src="https://uplift-docs-assets.s3.amazonaws.com/range_of_motion/range_of_motion-t_spine_rotation-right_combined.mp4" />
</Frame>

## Dimensions

Required inputs for processing:

* **None**

## Discrete Metrics

| Metric                       | Units   | Description                                         | Column Name                                     |
| ---------------------------- | ------- | --------------------------------------------------- | ----------------------------------------------- |
| Direction                    | -       | The direction of the twist \['left','right]         | `t_spine_rotation_direction`                    |
| Peak Rotation                | degrees | Maximum rotation angle, relative to ankles          | `t_spine_rotation_peak_trunk_rotation`          |
| Functional                   | -       | If both pelvis and trunk rotations > 45°            | `t_spine_rotation_functional`                   |
| Peak Pelvis Rotation         | degrees | Maximum pelvis rotation angle, relative to ankles   | `t_spine_rotation_peak_pelvis_rotation`         |
| Peak Trunk-Pelvis Separation | degrees | Difference between trunk and pelvis rotation angles | `t_spine_rotation_peak_trunk_pelvis_separation` |

## Notes

* Sufficient rotation is defined as ≥ 45°