Thomas Hip Flexion Screen

Screen Thomas-test thigh rise while checking sufficient knee flexion.

Description

Thomas-test screening combines thigh elevation with a minimum knee-flexion condition.

Thomas-test screening combines thigh elevation with a minimum knee-flexion condition. The flag requires both comparisons to hold.^[1]

Screen Thomas-test thigh rise while checking sufficient knee flexion.

When to use Thomas Hip Flexion Screen

Use this tool to screen Thomas-test thigh rise while checking sufficient knee flexion.

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.

How to use Thomas Hip Flexion 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 thighElevationDegrees, maximumElevationDegrees, kneeFlexionDegrees, minimumKneeFlexionDegrees using the field table and calculation rules, then run the tool.
Read thighExcessDegrees, hipFlexionLimitFlag. 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
thighElevationDegrees	Thigh elevation degrees	number	Required
maximumElevationDegrees	Maximum elevation degrees	number	Required
kneeFlexionDegrees	Knee flexion degrees	number	Required
minimumKneeFlexionDegrees	Minimum knee flexion degrees	number	Required

Enter finite measured angles and nonnegative screening cutoffs. Return thigh-minus-maximum excess and combined flag. Signed measured angles are accepted.

flag=thighElevation>maximum AND kneeFlexion≥minimum

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
thighExcessDegrees	Thigh excess degrees	number
hipFlexionLimitFlag	Hip flexion limit flag	boolean

json

{
  "input": {
    "thighElevationDegrees": 15,
    "maximumElevationDegrees": 5,
    "kneeFlexionDegrees": 80,
    "minimumKneeFlexionDegrees": 70
  },
  "output": {
    "thighExcessDegrees": 10,
    "hipFlexionLimitFlag": true
  }
}

Limitations and assumptions

No examination technique, muscle-specific diagnosis or clinical cutoff is established.

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 Shoulder Rotation Arc: Sum shoulder internal/external rotation arc and compare with a caller target. For a complementary task, use Knee Wall Dorsiflexion Screen: Screen knee-to-wall ankle dorsiflexion against a supplied minimum distance.

References

Thomas Hip Flexion Screen — tool.io

Similar or alternative tools

Shoulder Rotation Arc
Sum shoulder internal/external rotation arc and compare with a caller target.
Knee Wall Dorsiflexion Screen
Screen knee-to-wall ankle dorsiflexion against a supplied minimum distance.