Description
For positive legLength and scaleFactor return signedWidth=secondLateral-firstLateral, absoluteWidth=abs(signedWidth), and normalized=absoluteWidth*scaleFactor/legLength.
Foot and footwear research uses geometric dimensions, contact cells, forces, and measurement records. A length margin, normalized difference, or contact share has a specific measurement basis and can omit important three-dimensional or sensor effects. Arithmetic on supplied observations is separate from a validated clinical assessment.
For positive legLength and scaleFactor return signedWidth=secondLateral-firstLateral, absoluteWidth=abs(signedWidth), and normalized=absoluteWidth*scaleFactor/legLength.
When to use this tool
Use Gait Research Step Width Normalizer when you have supplied foot, footwear, bench, or recording data and need this measurement or record-support calculation.
How to use the tool and how it works
- Enter firstLateral, secondLateral, legLength, scaleFactor. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read signedWidth, absoluteWidth, normalized. Use the output convention below.
For positive legLength and scaleFactor return signedWidth=secondLateral-firstLateral, absoluteWidth=abs(signedWidth), and normalized=absoluteWidth*scaleFactor/legLength.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstLateral | First Lateral | Required. Finite number. |
| secondLateral | Second Lateral | Required. Finite number. |
| legLength | Leg Length | Required. Finite number; strictly above 0. |
| scaleFactor | Scale Factor | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| signedWidth | Signed Width | Required. Finite number. |
| absoluteWidth | Absolute Width | Required. Finite number. |
| normalized | Normalized | Required. Finite number. |
{
"input": {
"firstLateral": -5,
"secondLateral": 7,
"legLength": 100,
"scaleFactor": 100
},
"output": {
"signedWidth": 12,
"absoluteWidth": 12,
"normalized": 12
}
}Limitations and assumptions
- Coordinates and leg length need a consistent length basis; scaleFactor is an explicit dimensionless reporting multiplier. The result does not establish gait abnormality or align scans automatically.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.
Alternative or Complementary methods
Use a documented measurement protocol with calibrated equipment and appropriate geometric or contact models. Broader interpretation requires assessment of the underlying observations beyond one length, ratio, or support flag.
References
Similar or alternative tools
- Podiatry Research Left Right Length Gap
Compare supplied research foot lengths with independent bounded measurement errors.
- Heel Height Footbed Slope Geometry Term
For positive horizontalRun and nonnegative heelHeight and forefootHeight return rise=heelHeight-forefootHeight, slope=rise/horizontalRun, and angleRadians=atan2(rise,horizontalRun).