Antalgic Stance Asymmetry
Quantify left/right gait stance-time asymmetry relative to their mean.
Description
Stance-time asymmetry compares left and right durations relative to their mean.
Stance-time asymmetry compares left and right durations relative to their mean. It gives magnitude without identifying a painful side.1
Quantify left/right gait stance-time asymmetry relative to their mean.
When to use Antalgic Stance Asymmetry
Use this tool to quantify left/right gait stance-time asymmetry relative to their mean.
Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
How to use Antalgic Stance Asymmetry and understand its results
- Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
- Enter leftStanceSeconds, rightStanceSeconds using the field table and calculation rules, then run the tool.
- Read meanStanceSeconds, asymmetryPercent. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| leftStanceSeconds | Left stance seconds | number | Required |
| rightStanceSeconds | Right stance seconds | number | Required |
Enter positive stance seconds. Return mean duration and percentage.
asymmetry%=100|left−right|/mean(left,right) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| meanStanceSeconds | Mean stance seconds | number |
| asymmetryPercent | Asymmetry percent | number |
{
"input": {
"leftStanceSeconds": 0.6,
"rightStanceSeconds": 0.4
},
"output": {
"meanStanceSeconds": 0.5,
"asymmetryPercent": 39.99999999999999
}
}Limitations and assumptions
No antalgic-gait diagnosis, pain evidence or stride-event detection is supplied.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Double Support Gait Percent: Measure fraction of a gait cycle with both feet on the ground. For a complementary task, use Jump Phase Asymmetry: Calculate bilateral force asymmetry separately for propulsion and landing.
References
-
Antalgic Stance Asymmetry — tool.io
Similar or alternative tools
- Double Support Gait Percent
Measure fraction of a gait cycle with both feet on the ground.
- Jump Phase Asymmetry
Calculate bilateral force asymmetry separately for propulsion and landing.