> ## 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.

# Shank Angle WRT Global

> Angle of the shank (lower leg) segment relative to the global coordinate system, in a given plane.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** degrees
* **Column Name:** Varies by plane (see Axes Orientation); left/right reported separately
* **Aggregation:** mean
* **Precision:** 0
* **Optimal Direction:** Middle — moderate values are optimal
* **Measurement:** Shank segment angle in the specified plane (sagittal, frontal, or twist) relative to global reference

## Axes Orientation

This metric is reported for the shank segment in three planes. Column names follow the pattern `left_shank_angle_global_*`, `right_shank_angle_global_*`. The **plane** (and side) determines which column applies:

* **Sagittal:** Anterior–posterior or forward-backward angles, like a somersault
  * Column examples: `left_shank_angle_global_sagittal`, `right_shank_angle_global_sagittal`.
* **Frontal:** Medial–lateral or side-side angles, like a cartwheel
  * Column examples: `left_shank_angle_global_frontal`, `right_shank_angle_global_frontal`.
* **Twist (transverse):** Twisting rotation like a tornado
  * Column examples: `left_shank_angle_global_twist`, `right_shank_angle_global_twist`.

## Description

Shank angle WRT (with respect to) global describes the orientation of the shank (lower leg) segment in the global coordinate system.
Sagittal, frontal, and twist components are reported separately.

Used in some jump types (e.g., countermovement) for segment orientation and research.
The plane (sagittal, frontal, twist) determines which column name applies.

## Use Cases

* Segment orientation and technique
* Bilateral comparison
* Research and detailed kinematics