> ## 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.

# Knees Track

> Binary indicator of whether the knees track properly over the toes during the jump

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Boolean (binary)
* **Units:** 1 = yes *correct*, 0 = no *incorrect*
* **Column Name:** `knees_track`
* **Aggregation:** rate
* **Precision:** 0
* **Optimal Direction:** Lower is better
* **Measurement:** knee-to-ankle separation ratio: the relative distance between knees and ankles
  * Distance threshold: 85% - the the knee-knee distance drops below 85% of the ankle-ankle distance, then the knees do not track

## Description

Knees track is a binary flag indicating whether the knees track properly over the toes during the jump and landing.
Poor tracking (e.g., knee valgus or inward knee motion) is associated with injury risk.

Knees track is determined using the knee to ankle separation ratio, measuring the relative distances between both knees and both ankles.
If the knee-to-knee distance crosses below 85% of the ankle-to-ankle distance, then the knees do not track, flagging suboptimal jumping mechanics.

## Use Cases

* Movement quality and injury risk screening
* Coaching feedback
* Landing mechanics assessment