Description
Reorient a recorded joint angle to an extension-positive convention.
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.
Reorient a recorded joint angle to an extension-positive convention.
When to use this tool
Use Joint Range Extension Sign when you already have recordedAngle, positiveMeansExtension and need to reorient a recorded joint angle to an extension-positive convention.
How to use the tool and how it works
- Enter recordedAngle, positiveMeansExtension. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read extensionPositiveAngle. Use the output convention below.
Return recordedAngle unchanged when positiveMeansExtension=true, otherwise negate it.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| recordedAngle | Recorded Angle | Required. Finite number. |
| positiveMeansExtension | Positive Means Extension | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| extensionPositiveAngle | Extension Positive Angle | Required. Finite number. |
{
"input": {
"recordedAngle": 10,
"positiveMeansExtension": true
},
"output": {
"extensionPositiveAngle": 10
}
}Limitations and assumptions
- No motion, range, normal value, anatomical zero or treatment instruction is inferred.
- 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
Similar or alternative tools
- Periodontal Recession Sign Label
Reorient a signed recession distance to an apical-positive convention.
- Osteopathic Motion Zero Offset
Measure a recorded motion angle relative to a supplied zero.