Description
Compare supplied left and right limb lengths.
Orthopedic measurements distinguish side, reference origin, image scale, device lots and mechanical test geometry. A two-point load/displacement slope is structural stiffness rather than a material modulus. Supplied matches, offsets and calibration factors need verified anatomy, devices and test conditions before clinical or design interpretation.
Compare supplied left and right limb lengths.
When to use this tool
Use Limb Side Length Difference when you already have leftLength, rightLength and need to compare supplied left and right limb lengths.
How to use the tool and how it works
- Enter leftLength, rightLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read leftMinusRight, absoluteDifference. Use the output convention below.
Require nonnegative lengths; return left-right and abs(left-right).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| leftLength | Left Length | Required. Finite number; minimum 0. |
| rightLength | Right Length | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| leftMinusRight | Left Minus Right | Required. Finite number. |
| absoluteDifference | Absolute Difference | Required. Finite number. |
{
"input": {
"leftLength": 85,
"rightLength": 83
},
"output": {
"leftMinusRight": 2,
"absoluteDifference": 2
}
}Limitations and assumptions
- Units and measurement methods must match; no anatomical discrepancy, cause, clinical importance or treatment is determined.
- 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. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Inspect actual device specifications, calibrated images and the full measurement or test setup. Use complete geometry and material/test information when relating a local scale, side match or structural secant slope to a physical or clinical question.
References
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