SFMA Shoulder Flexion
Biomechanical analysis of SFMA shoulder flexion range of motion assessment, including compensations and functional scoring.
SFMA Shoulder Flexion
Overview
The SFMA (Selective Functional Movement Assessment) shoulder flexion assessment evaluates the range of motion and quality of movement in the shoulder during flexion. This assessment measures the ability to achieve sufficient flexion while maintaining proper alignment and identifying any compensations.Events
| Event | Data Type | Description |
|---|---|---|
| MaxFlexion | Int | Frame of maximum shoulder flexion |
| MaxFlexionStart | Int | Frame of movement start |
Discrete Metrics
| Metric | Data Type | Units | Description |
|---|---|---|---|
| MaxFlexionAngle | Float | degrees | Maximum shoulder flexion angle |
| MaxAbductionAngle | Float | degrees | Maximum shoulder abduction angle |
| MaxExternalRotation | Float | degrees | Maximum external rotation |
| SideBendComp | Boolean | - | Whether side bend compensation occurred (> 20°) |
| WristDeviation | Float | degrees | Wrist deviation angle |
| Functional | Boolean | - | Whether movement is functional |
| WristToShoulderDistance | Float | m | Distance from wrist to shoulder |
Notes
- All angular measurements follow ISB conventions
- Maximum flexion is detected using peak detection with 30° prominence
- If no flexion peak is found, it looks for abduction peaks
- Start event is detected by finding a window of 30 frames where the shoulder flexion difference is less than 0.5 degrees
- Functional movement is determined by wrist/fingertip position relative to shoulder