Hip Flexibility Testing: MAT Hip Internal Rotation Test

The MAT Hip Internal Rotation Test assesses hip internal rotation range of motion. Hip internal rotation can be measured in different positions, including sitting, prone or supine with hip flexion, and results can vary depending on setup. Research supports the reliability of digital inclinometers and goniometers for hip internal rotation measurement when standardised, and normative values are typically reported around 30–45 degrees, depending on method and population.  

Introduction

Hip internal rotation is important for squatting, gait, running, pivoting, cutting, rotation-based sports and lower-limb movement control. Measuring hip internal rotation can help identify side-to-side differences, mobility limitations or changes over time.

However, hip internal rotation should not be interpreted in isolation. ROM can be influenced by bony anatomy, soft tissue tolerance, pelvic position, pain, symptoms, sport demands and testing position.

Quick Summary

Test name: MAT Hip Internal Rotation Test
Category: Hip range of motion / mobility assessment
Primary score: Hip internal rotation angle in degrees
Common positions: Seated, prone or supine 90/90
Best use: Baseline ROM, side-to-side comparison and retesting
Key limitation: Position and pelvic control strongly affect results.

What Is the Assessment?

The Hip Internal Rotation Test measures how far the femur can rotate inward relative to the pelvis. The test may be performed:

• Seated with hip and knee at 90 degrees
• Prone with knee flexed
• Supine with hip and knee at 90 degrees
• Weight-bearing or functional rotation variations

The chosen method must be recorded because hip rotation values differ by position and measurement approach.

Why It Is Used

The test may be used to assess:

• Hip internal rotation range of motion
• Side-to-side hip mobility differences
• Baseline and retest change
• Hip mobility in sport or gym contexts
• Rotation capacity relevant to squatting, running and pivoting
• Symptom response during hip rotation

What It Measures

The test measures hip internal rotation range of motion.

It may reflect:

• Femoroacetabular rotation capacity
• Soft tissue tolerance
• Pelvic control
• Side-to-side difference
• Symptom response
• Sport-specific rotational mobility

It does not diagnose hip pathology or identify the cause of reduced motion on its own.

Who It Is Used For

The test may be useful for:

• Field sport athletes
• Runners
• Lifters
• Golfers
• Rotational sport athletes
• General fitness clients
• Clients monitoring hip mobility
• Professionals recording ROM baselines

It may need modification if a client has pain, guarding, symptoms or difficulty maintaining the test position.

Equipment Required

• Treatment table, bench or chair depending on position
• Measurz inclinometer or goniometer
• Optional Measurz AR measurement for setup consistency
• Optional Measurz stopwatch, metronome or rep counter for related movement-control tests
• MAT tools such as Anker, Gripper or Muscle Meter for related hip strength testing
• Measurz/MAT platform to record side, angle, position, symptoms and retest comparison

Step-by-Step Protocol

Seated Version

1. Client sits with hips and knees flexed to 90 degrees.
2. Stabilise or monitor the pelvis.
3. Move the lower leg outward to produce hip internal rotation.
4. Stop at the end of available range or symptom limit.
5. Record the angle.
6. Repeat on both sides.

Prone Version

1. Client lies prone with the knee flexed to 90 degrees.
2. Stabilise the pelvis.
3. Move the lower leg outward to create hip internal rotation.
4. Measure the final angle using inclinometer or goniometer.
5. Repeat on both sides.

Scoring and Interpretation

Record:

• Hip internal rotation angle
• Side tested
• Testing position
• Active or passive measurement
• Pelvic control
• Pain or symptoms
• End-feel or limitation notes
• Side-to-side difference

Reduced internal rotation may be relevant when it is large, symptomatic, side-to-side different, or linked to movement goals. Avoid diagnosing based on the ROM value alone.

Normative Data, Benchmarks or Reference Values

Common clinical references often list hip internal rotation around 30–45 degrees, depending on testing position and source. A study of healthy Japanese adults found hip rotation ROM differed by sex and supported comparing values across positions rather than relying on a single universal number.  

Practical field guidance only:

• Typical adult range: approximately 30–45 degrees
• Worth monitoring: clear side-to-side difference, especially if greater than 10 degrees
• Interpret cautiously: values vary by position, sport, anatomy and symptoms

Reliability and Validity

Charlton and colleagues found concurrent validity between a digital inclinometer and universal goniometer for passive hip internal and external rotation measurements. Other research supports digital inclinometer reliability for hip internal rotation measurement, while newer IMU studies show promise for hip ROM measurement when compared with goniometer and inclinometer methods.  

Common Errors and Limitations

Common errors include:

• Pelvic rotation during testing
• Changing hip flexion angle
• Comparing seated and prone values directly
• Not recording active versus passive testing
• Measuring past symptom limit
• Not recording side-to-side difference
• Assuming low IR automatically indicates pathology

Practical Applications

The MAT Hip Internal Rotation Test can help professionals:

• Monitor hip mobility
• Compare sides
• Track changes over time
• Support squat, running, pivoting and rotation-based assessment
• Combine hip ROM with hip strength, trunk mobility, ankle mobility and movement testing

How to Record This in Measurz/MAT

Record:

• Test name: Hip Internal Rotation Test
• Side tested
• Testing position
• Active or passive measurement
• Angle in degrees
• Pelvic control notes
• Pain score
• Symptoms
• End-feel or limitation notes
• Retest date

Use the Measurz inclinometer for angle measurement and notes to record symptoms, side-to-side difference and test position.

FAQs

What does the Hip Internal Rotation Test measure?

It measures hip internal rotation range of motion.

What is a normal hip internal rotation value?

Many clinical references use approximately 30–45 degrees, but values vary by position, sex, age, activity and anatomy.

Should it be tested seated or prone?

Either may be used, but the position must be recorded and repeated consistently.

Does low hip internal rotation diagnose hip pathology?

No. Low range may be relevant, but it does not diagnose the cause.

Can this be recorded in Measurz?

Yes. Measurz can record angle, side, position, symptoms and retest change.

Key Takeaways

• The test measures hip internal rotation ROM.
• Position strongly affects results.
• Side-to-side comparison is important.
• Reliability improves with pelvic control and consistent measurement.
• Measurz can record angle, symptoms and progress.

References

Charlton, P. C., Mentiplay, B. F., Pua, Y.-H., & Clark, R. A. (2015). Reliability and concurrent validity of a smartphone, bubble inclinometer and motion analysis system for measurement of hip joint range of motion. Journal of Science and Medicine in Sport.

Kim, S. G., & Lim, D. H. (2015). Hip rotation range of motion in sitting and prone positions in healthy Japanese adults. Journal of Physical Therapy Science, 27(2), 441–445.

Movement Assessment Technologies. (n.d.). MAT hip internal rotation test. https://www.matassessment.com/blog/mat-hip-internal-rotation-test 

Widler, K. S., Glatthorn, J. F., Bizzini, M., Impellizzeri, F. M., Munzinger, U., Leunig, M., & Maffiuletti, N. A. (2009). Assessment of hip abductor muscle strength: A validity and reliability study. Journal of Bone and Joint Surgery.