> ## 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.

# Loading Phase Knee Asymmetry

> Binary indicator if there is significant asymmetry in knee flexion between the front and back legs during loading.

## Technical Details

* **Variable Type:** Movement Flag
* **Data Type:** Integer
* **Units:** N/A
* **Column Name:** `loading_phase_knee_asymmetry`
* **Optimal Direction:** Lower is better
* **Unknown Value:** -1
* **Measurement:** Difference between [Loading Phase Max Knee Flexion Front Leg](/biomechanics/activities/tennis/metrics/loading-phase-knee-flexion) and [Loading Phase Max Knee Flexion Back Leg](/biomechanics/activities/tennis/metrics/loading-phase-knee-flexion)
* **Threshold:** Front-to-back knee flexion difference greater than 15°

## Description

Loading phase knee asymmetry is a binary indicator that flags when there is more than a 15° difference in maximum knee flexion between the front and back legs during the loading phase, which can indicate an uneven weight distribution or loading pattern between the legs.

## Use Cases

* Lower-body load distribution assessment
* Mechanics evaluation