> ## 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.

# Max Front Knee Valgus (Normalized)

> Maximum inward (valgus) collapse of the front knee during the serve, expressed as a multiple of athlete height.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** × height (ratio to athlete height)
* **Column Name:** `max_front_knee_valgus_upward_per_ht`
* **Measurement:** Maximum medial (inward) displacement of the front knee during the serve, divided by athlete height

## Description

Max front knee valgus (normalized) measures how far the front knee collapses inward, toward the centerline of the body, at its most extreme point during the serve, expressed as a multiple of the athlete's height. More negative values indicate greater inward collapse. It is closely related to the [Loading Phase Excessive Knee Valgus](/biomechanics/activities/tennis/flags/loading-phase-excessive-knee-valgus) movement flag.

## Use Cases

* Injury risk identification
* Lower-body mechanics evaluation
* Related to Loading Phase Excessive Knee Valgus flag