Shoulder Orthopaedic Test: Norwood Stress Test

The Norwood Stress Test assesses anterior shoulder laxity through passive anterior translation of the humeral head. It helps identify instability tendencies but does not confirm structural injury.

Introduction

Shoulder instability involves passive capsular restraint, active muscular control and load tolerance working together.

The Norwood Stress Test applies controlled anterior force to assess how well the shoulder resists anterior translation.

It is best used as part of an instability cluster rather than a standalone test.

A positive result may suggest instability tendency but does not confirm pathology.

Quick Summary

• Primary purpose: Assess anterior shoulder stability

• Body region: Shoulder

• Commonly associated with: Anterior instability

• Positive finding: Excessive translation or symptom reproduction

• Negative finding: Stable, controlled end-feel

• Clinical role: Supports instability assessment reasoning

• Best used with: Load and Shift + Apprehension tests

What Is Norwood Stress Test?

It is a passive test where anterior force is applied to the humeral head while stabilising the scapula.

It is used to assess passive anterior restraint and symptom response.

Why It Is Used

It may help assess:

• suspected shoulder instability

• capsular laxity

• instability risk in athletes

• changes in shoulder stability over time

What It Assesses

• anterior glenohumeral translation

• capsular restraint

• symptom reproduction

• side-to-side differences

Who It Is Useful For

Useful for:

• exercise professionals

• strength and conditioning coaches

• rehab practitioners

• movement educators

When to Use This Test

Use when there is:

• history of shoulder instability

• feeling of slipping or giving way

• apprehension in pressing or throwing

• recurrent shoulder symptoms

When Not to Use or Be Cautious

Avoid in:

• acute trauma

• post-surgical restrictions

• high pain or guarding

• suspected dislocation

Stop if:

• pain increases significantly

• strong instability sensation occurs

Equipment Required

None required.

Step-by-Step Protocol / Practice

Client is relaxed in supine or seated position with shoulder slightly abducted.

Examiner stabilises scapula and applies controlled anterior force to the humeral head.

Observe:

• translation quality

• symptom reproduction

• end-feel

• side comparison

Positive finding: excessive translation or instability symptoms.
Negative finding: firm control and no symptoms.

Positive and Negative Test Interpretation

Positive result may mean:
Possible anterior shoulder instability or capsular laxity, especially with supporting history and tests.

Negative result may mean:
Better passive stability, but dynamic instability can still exist.

It does not confirm or exclude structural injury on its own.

Sensitivity, Specificity and Diagnostic Accuracy

Evidence for this specific test is limited.

It does not have well-established sensitivity, specificity or likelihood ratios in high-quality modern studies.

Because of this:

• it should not be used in isolation

• it is best interpreted in a cluster

• clinical history is essential

Reliability and Validity

• Reliability depends on consistent force application

• Interpretation can vary between examiners

• Validity improves when used with other instability tests

• Limited standalone diagnostic strength

Common Errors and Limitations

Errors:

• inconsistent force

• poor scapular stabilisation

• over-interpreting mild differences

• not comparing sides

Limitations:

• subjective grading

• limited diagnostic accuracy evidence

• overlap with neuromuscular control issues

Practical Applications

• instability screening

• return-to-sport decisions

• monitoring shoulder stability changes

• guiding load progression

• part of instability test cluster

How to Record This in Measurz

Record:

• Test name

• Side tested

• Result (positive / negative / unclear)

• Translation description

• Pain score (0–10)

• Symptom reproduction

• End-feel quality

• Comparison side

• Irritability level

• Compensations

• Related findings

• Notes on interpretation

Related Tests / Internal Links

Load and Shift Test
Apprehension Test
Relocation Test
Sulcus Sign
Scapular Control Assessment

FAQs

What does the Norwood Stress Test assess?
Shoulder stability under anterior stress.

Does it confirm instability?
No. It only suggests possible instability.

What is a positive result?
Excessive movement or reproduction of instability symptoms.

Should it be used alone?
No. It should be part of a test cluster.

Is it reliable?
Reliability depends on technique consistency.

Key Takeaways

What does the Norwood Stress Test assess?
Anterior shoulder stability under passive stress.

Does it confirm instability?
No. It only suggests possible instability and must be combined with other findings.

What does a positive result mean?
It may indicate increased anterior laxity or instability tendency.

What does a negative result mean?
It may suggest better passive stability, but does not rule out dynamic instability.

Should it be used alone?
No. It should always be part of an instability test cluster.

How strong is the evidence?
Evidence for diagnostic accuracy is limited, so results should be interpreted cautiously.

What is its main value?
Supporting clinical reasoning through pattern recognition, not diagnosis.

References

Hegedus, E. J., et al. (2018–2022). Diagnostic accuracy of shoulder special tests: systematic review updates. British Journal of Sports Medicine.

Lewis, J. (2021–2023). Shoulder pain and instability clinical reasoning updates. British Journal of Sports Medicine.

Kibler, W. B., et al. (2013). Shoulder instability and scapular mechanics in overhead athletes. British Journal of Sports Medicine.