Shoulder Rotation Arc
Sum shoulder internal/external rotation arc and compare with a caller target.
Description
Shoulder rotation arc adds supplied internal and external ranges.
Shoulder rotation arc adds supplied internal and external ranges. Shortfall clips unmet target distance at zero.1
Sum shoulder internal/external rotation arc and compare with a caller target.
When to use Shoulder Rotation Arc
Use this tool to sum shoulder internal/external rotation arc and compare with a caller target.
Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
How to use Shoulder Rotation Arc 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 externalRotationDegrees, internalRotationDegrees, minimumArcDegrees using the field table and calculation rules, then run the tool.
- Read totalArcDegrees, shortfallDegrees, meetsTarget. 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 |
|---|---|---|---|
| externalRotationDegrees | External rotation degrees | number | Required |
| internalRotationDegrees | Internal rotation degrees | number | Required |
| minimumArcDegrees | Minimum arc degrees | number | Required |
Enter nonnegative angles and target degrees. Return arc, shortfall and inclusive ≥target flag.
arc=internal+external; shortfall=max(0,target−arc) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| totalArcDegrees | Total arc degrees | number |
| shortfallDegrees | Shortfall degrees | number |
| meetsTarget | Meets target | boolean |
{
"input": {
"externalRotationDegrees": 90,
"internalRotationDegrees": 70,
"minimumArcDegrees": 170
},
"output": {
"totalArcDegrees": 160,
"shortfallDegrees": 10,
"meetsTarget": false
}
}Limitations and assumptions
Measurement position, pain and population-specific clinical interpretation are not assessed.
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. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Thomas Hip Flexion Screen: Screen Thomas-test thigh rise while checking sufficient knee flexion. For a complementary task, use Handstand Shoulder Angle Screen: Compare the measured value with caller-supplied bounds for handstand shoulder angle screen.
References
-
Shoulder Rotation Arc — tool.io
Similar or alternative tools
- Thomas Hip Flexion Screen
Screen Thomas-test thigh rise while checking sufficient knee flexion.
- Handstand Shoulder Angle Screen
Compare the measured value with caller-supplied bounds for handstand shoulder angle screen.