Y-Balance Lower Quarter
Biomechanical analysis of Y-Balance lower quarter test, including reach distance and stability measurements.
Y-Balance Lower Quarter
Overview
Events
| Metric | Data Type | Description |
|---|---|---|
| Bottom | Int | the instant of maximum reach |
Phases and Stages
| Phase | Stage | Start | End | Event or Phase |
|---|---|---|---|---|
| Reach | Dynamic | Initiation | Bottom | Phase |
| Return | Dynamic | Bottom | End | Phase |
Discrete Metrics
| Metric | Data Type | Units | Description |
|---|---|---|---|
| Anterior Forward Displacement | Float | meters | Maximum reach distance in anterior direction |
| Anterior Forward Displacement Relative | Float | ratio | Maximum reach distance normalized by leg length |
| Anterior Trunk Range of Motion Frontal Plane | Float | degrees | Range of trunk motion in frontal plane during reach |
| Anterior Stance Knee Medial Translation | Float | meters | Medial translation of stance knee during reach |
| Anterior Stance Hip Range of Motion Flexion | Float | degrees | Range of hip flexion during reach |
| Anterior Stance Hip Max Flexion | Float | degrees | Maximum hip flexion during reach |
| Anterior Stance Knee Range of Motion Flexion | Float | degrees | Range of knee flexion during reach |
| Anterior Stance Knee Max Flexion | Float | degrees | Maximum knee flexion during reach |
Notes
- All angular measurements follow ISB conventions
- Kinematic data typically captured at 240Hz for stability activities
- Test requires footedness specification (‘left’ or ‘right’)
- Leg length is used to normalize reach distance
- Knee medial translation is measured as orthogonal distance from hip-foot plane