Single Leg Stance
Biomechanical analysis of single leg stance balance assessment, including sway measurements and trunk lean evaluation.
Single Leg Stance
Overview
Events
| Metric | Data Type | Description |
|---|---|---|
| Initiation | Int | the start of the single leg stance |
| End | Int | the end of the single leg stance |
Phases and Stages
| Phase | Stage | Start | End | Event or Phase |
|---|---|---|---|---|
| Stance | Static | Initiation | End | Phase |
Discrete Metrics
| Metric | Data Type | Units | Description |
|---|---|---|---|
| Stance Time | Float | seconds | Duration of the single leg stance |
| Stance Time Clearance | Int | N/A | Whether stance time passed threshold (1) or not (0) |
| Mean Sway Velocity | Float | m/s | Average velocity of body center of mass during stance |
| Percentile 75 Sway Velocity | Float | m/s | 75th percentile of sway velocity during stance |
| Mediolateral Displacement | Float | meters | Maximum mediolateral displacement of center of mass |
| Anteroposterior Displacement | Float | meters | Maximum anteroposterior displacement of center of mass |
| Sway Area | Float | m² | Area of sway calculated from ML and AP displacement |
| Left Trunk Lean | Float | degrees | Maximum left trunk lean in frontal plane |
| Right Trunk Lean | Float | degrees | Maximum right trunk lean in frontal plane |
| Excessive Trunk Lean | Int | N/A | Whether trunk lean exceeds threshold (1) or not (0) |
Notes
- All angular measurements follow ISB conventions
- Kinematic data typically captured at 240Hz for stability activities
- Stance time clearance threshold is set to 10 seconds
- Excessive trunk lean threshold is set to 10 degrees