Range of Motion: Hip Extension

The Hip Extension Test measures how far the thigh moves behind the body. It is useful for assessing hip mobility, comparing sides, monitoring symptoms and tracking progress over time.

Introduction

Hip extension range of motion is relevant to walking, running, sprinting, lunging, bridging, climbing stairs and many athletic movements. When hip extension is limited in a test position, the body may use lumbar extension, pelvic rotation or stride changes to complete a task.

A hip extension score should not be interpreted on its own. It is best used alongside symptoms, pelvic control, hip flexor flexibility, glute strength, gait or running findings, and the client’s baseline.

Quick Summary

• Measures hip movement behind the body.
• Usually assessed in prone, side lying or modified Thomas-style positions.
• Can be active or passive.
• Pelvic and lumbar control are essential.
• Record degrees, side, pain, symptoms and compensation.

What Is the Hip Extension Test?

The Hip Extension Test measures sagittal-plane hip extension. It can be assessed actively, where the client lifts or moves the thigh themselves, or passively, where the professional guides the limb into extension.

Prone testing is common because it allows the hip to move behind the body while the pelvis can be observed closely.

Why It Is Used

Hip extension testing is used to:

• establish baseline hip mobility
• compare left and right sides
• monitor progress across sessions
• observe lumbar or pelvic compensation
• guide exercise range selection
• provide context for running, walking, lunging and bridging
• track symptom response with extension

What It Measures

The test measures hip extension ROM in degrees. It may be influenced by:

• hip flexor and anterior hip tolerance
• pelvic tilt
• lumbar extension
• glute strength and control
• pain, apprehension or guarding
• previous injury or surgery
• warm-up and testing position
• measurement tool and examiner technique

Who It Is Useful For

This test is useful for:

• runners and field athletes
• clients returning to sprinting or lunging
• gym clients working on hip mobility
• older adults where stride length and walking mechanics matter
• post-injury monitoring when appropriate
• professionals tracking hip ROM alongside strength and function

Equipment Required

• Firm plinth or mat
• Inclinometer, goniometer or digital ROM tool
• Pain scale
• Measurz recording profile
• Optional strap or towel for pelvic control

Step-by-Step Protocol / Practice

1. Position the client. Place the client prone with both legs relaxed and the pelvis level.
2. Set the pelvis. Monitor the pelvis and lumbar spine. The goal is hip extension, not lumbar arching.
3. Active ROM. Ask the client to keep the knee relaxed and lift the thigh slightly from the table without twisting the pelvis.
4. Passive ROM. If appropriate, gently guide the thigh into extension while keeping the pelvis stable.
5. Device placement. With a goniometer, align the axis near the greater trochanter, using the trunk and femur as reference lines. With an inclinometer, record exact placement and orientation.
6. End point. Stop at the first firm end point, symptom limit or loss of pelvic control.
7. Ask what the client feels. Record pain, stretch, anterior hip pressure, lumbar discomfort or apprehension.
8. Watch for compensation. Note lumbar extension, pelvic rotation, hip abduction, knee flexion change or trunk movement.
9. Trials. Use one familiarisation trial and one to three recorded trials.
10. Retest consistency. Use the same position, warm-up, device, side order and scoring convention.

Scoring and Interpretation

Record hip extension in degrees. Higher values generally represent greater available hip extension in the test position. Lower values show less available range but do not explain the cause on their own.

Interpret with:

• active versus passive ROM
• side-to-side comparison
• pain score
• anterior hip or lumbar symptoms
• pelvic control
• hip flexor length context
• glute strength findings
• gait, running or lunge observations
• baseline change

A small change between sessions may reflect measurement error unless the setup is consistent and the change is repeated.

Normative Data, Benchmarks or Reference Values

Evidence level: Level 2 — closest available reference values.

General hip extension reference values are often reported around 10–15 degrees, but values vary by protocol, position, age, sex, activity level and whether pelvic movement is controlled. CDC joint ROM reference data support the broader point that ROM values vary by demographic group and should not be treated as a single universal normal value.  

Because prone hip extension is highly affected by pelvic and lumbar compensation, practical interpretation should prioritise:

• baseline score
• left versus right difference
• active versus passive range
• pain and symptom response
• pelvic control
• relevance to walking, running, sprinting or lunging goals

Reliability and Validity

Hip ROM reliability depends on standardised positioning, examiner consistency and measurement tool. A 2020 PLOS ONE reliability study found that reliability differs across ROM tests and devices, reinforcing the need to use the same method when tracking progress.  

A 2022 study of smartphone goniometers for hip ROM reported high intra-rater reliability but lower inter-rater reliability, which means the same professional repeating the same standardised method may produce more consistent results than comparing between different testers.  

No high-quality published MDC or MCID was found for this exact prone hip extension protocol across all populations. Small changes should be interpreted cautiously unless they are consistent, meaningful and aligned with symptoms or function.

Sensitivity and Specificity

Sensitivity and specificity are not usually applicable to hip extension ROM testing because it measures movement range rather than identifying a condition on its own.

Common Errors and Limitations

• allowing lumbar extension to inflate the result
• poor pelvic stabilisation
• inconsistent knee position
• measuring hip abduction instead of pure extension
• forcing passive range
• ignoring anterior hip or lumbar symptoms
• comparing prone and standing measurements directly
• assuming all clients need the same hip extension value

Practical Applications

Hip extension ROM can help with:

• baseline mobility testing
• running and gait context
• lunge, bridge and hip thrust programming
• monitoring anterior hip symptoms
• comparing sides
• tracking progress after mobility or strength work
• identifying whether related hip flexor, strength or functional testing may add useful context

How to Record This in Measurz

Record:

• test name: Hip Extension ROM
• side tested
• active or passive ROM
• score in degrees
• client position
• device used
• pain score
• symptom location
• pelvic or lumbar compensation
• comparison side
• baseline score
• trial number or best trial
• related hip flexor, glute strength or functional findings
• retest date

Example: “Right hip extension PROM 12°, prone, inclinometer, pain 0/10, mild lumbar extension near end range. Left 16°. Retest in four weeks.”

Related Tests / Internal Links

• Hip Flexion Test
• Hip Modified Thomas Test
• Hip Abduction Test
• Hip Adduction Test
• Prone Hip Internal Rotation Test
• Prone Hip External Rotation Test

FAQs

What is normal hip extension ROM?
General references often report about 10–15 degrees, but values vary by protocol, age, activity level and pelvic control.

Why is pelvic control important?
If the pelvis tilts or the lumbar spine extends, the score may look better without reflecting true hip extension.

Should hip extension be measured actively or passively?
Both can be useful. Active ROM shows what the client can control, while passive ROM shows available range with assistance.

What does reduced hip extension mean?
It shows less available extension in that test position. It does not explain the cause without other findings.

Key Takeaways

• Hip extension testing requires strict pelvic control.
• Record active and passive ROM separately.
• Compare sides, baseline and symptoms.
• Do not treat one reference value as universal.

References

Centers for Disease Control and Prevention. (2023). Normal joint range of motion study. https://archive.cdc.gov/www_cdc_gov/ncbddd/jointrom/index.html

Charlton, P. C., et al. (2022). Clinical reliability and usability of smartphone goniometers for hip range of motion measurement. Journal of Physical Therapy Science, 34(6), 424–431. PMID: 35698549

Fraeulin, L., et al. (2020). Intra- and inter-rater reliability of joint range of motion tests using tape measure, digital inclinometer and inertial motion capturing. PLOS ONE, 15(12), e0243646. https://doi.org/10.1371/journal.pone.0243646