Craniovertebral Angle Screen
Calculate craniovertebral angle from C7-to-ear coordinates and compare with target.
Description
Craniovertebral angle follows C7-to-ear vertical rise over forward displacement.
Craniovertebral angle follows C7-to-ear vertical rise over forward displacement. A supplied minimum screens the measured posture convention.1
Calculate craniovertebral angle from C7-to-ear coordinates and compare with target.
When to use Craniovertebral Angle Screen
Use this tool to calculate craniovertebral angle from C7-to-ear coordinates and compare with target.
Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
How to use Craniovertebral Angle Screen 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 c7ToEarVerticalCm, c7ToEarForwardCm, minimumAngleDegrees using the field table and calculation rules, then run the tool.
- Read craniovertebralAngleDegrees, belowTarget. 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 |
|---|---|---|---|
| c7ToEarVerticalCm | C 7 to ear vertical cm | number | Required |
| c7ToEarForwardCm | C 7 to ear forward cm | number | Required |
| minimumAngleDegrees | Minimum angle degrees | number | Required |
Enter nonnegative vertical cm, positive forward cm and minimum 0–90°. Return degrees and strict below-minimum flag.
angle=atan2(vertical,forward) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| craniovertebralAngleDegrees | Craniovertebral angle degrees | number |
| belowTarget | Below target | boolean |
{
"input": {
"c7ToEarVerticalCm": 1,
"c7ToEarForwardCm": 1,
"minimumAngleDegrees": 50
},
"output": {
"craniovertebralAngleDegrees": 45,
"belowTarget": true
}
}Limitations and assumptions
No landmark extraction, image calibration or postural diagnosis is performed.
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 Pelvic Tilt Angle: Estimate sagittal tilt from PSIS-above-ASIS rise and horizontal landmark separation. For a complementary task, use Fingertip Floor Distance Screen: Screen fingertip-to-floor distance with a caller-provided flexibility limit.
References
-
Craniovertebral Angle Screen — tool.io
Similar or alternative tools
- Pelvic Tilt Angle
Estimate sagittal tilt from PSIS-above-ASIS rise and horizontal landmark separation.
- Fingertip Floor Distance Screen
Screen fingertip-to-floor distance with a caller-provided flexibility limit.