> ## 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.

# Hip Knee Dominance

> Ratio of hip vs. knee contribution (0 = hip dominant, 1 = knee dominant) during eccentric or concentric phase.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** ratio (0–1)
* **Column Name:** Varies by phase and squat type
* **Aggregation:** mean
* **Precision:** 2
* **Optimal Direction:** Middle — moderate values are optimal
* **Measurement:** Relative contribution of hip vs. knee motion during the specified phase

## Events / Phases

This metric can be reported for different phases depending on squat type:

* **Eccentric:** From [Initiation](/biomechanics/activities/squat/events/initiation) to [Bottom](/biomechanics/activities/squat/events/bottom).
  * Column examples: `eccentric_hip_knee_dominance` (bodyweight, overhead); `left_eccentric_hip_knee_dominance`, `right_eccentric_hip_knee_dominance` (single leg).
* **Concentric:** From [Ascent Start](/biomechanics/activities/squat/events/ascent-start) to [End](/biomechanics/activities/squat/events/end).
  * Column examples: `concentric_hip_knee_dominance` (bodyweight, overhead); `left_concentric_hip_knee_dominance`, `right_concentric_hip_knee_dominance` (single leg).

## Description

Hip knee dominance describes how much the athlete uses the hip versus the knee during the eccentric or concentric phase of the squat. A value of 0 indicates hip-dominant strategy; 1 indicates knee-dominant. Single-leg squats report left/right-specific columns for each phase.

## Use Cases

* Movement strategy and injury risk (e.g., knee-dominant loading)
* Coaching and technique feedback
* Bilateral or single-leg comparison across phases