Clunk test: Procedure, interpretation and documentation template

Key takeaways

The clunk test is an orthopedic special test performed supine to detect glenoid labral tears and SLAP lesions.

A positive clunk test produces a clunking or grinding sensation during humeral rotation in full abduction.

Well-validated diagnostic-accuracy data specific to the clunk test are not currently available, so pair it with other special tests and imaging.

Pabau’s digital forms and clinical documentation features streamline clunk test assessment recording for practice records.

Shoulder labral tears affect thousands of patients annually, particularly in overhead athletes and individuals with glenohumeral instability. Many practitioners struggle to confidently perform and interpret special tests during the clinical examination, leading to missed pathology or unnecessary imaging referrals. The clunk test is a widely used orthopedic assessment that detects glenoid labral tears and superior labral pathology during a standard shoulder exam.

This guide explains how to perform the clunk test, interpret positive findings, and document results accurately. Physical therapists, athletic trainers, orthopedic surgeons, and sports medicine specialists all rely on accurate shoulder assessment to guide treatment. Physical therapy software helps you document and track these findings digitally.

What is the clunk test? Definition and clinical purpose

The clunk test is a specialized orthopedic test that assesses the integrity of the glenoid labrum. It helps clinicians detect labral pathology, including glenoid labral tears and SLAP lesions (superior labral anterior to posterior tears). Performed with the patient supine, the test moves the shoulder through specific ranges while applying force. The examiner listens for sounds or sensations that indicate structural damage.

In clinical practice, the clunk test serves as a screening tool during shoulder examination. A positive result is a clunking, clicking, or grinding sensation. This suggests labral involvement and typically prompts imaging (MRI or MRA) or a specialist referral. The test is particularly valuable in sports medicine settings, where overhead athletes frequently present with labral tears.

Unlike imaging, the clunk test requires no equipment and takes seconds to perform during a routine shoulder examination. However, clinicians must understand its limitations. Well-validated diagnostic-accuracy data specific to the clunk test are not currently available in the literature.

Clinicians should treat it as one part of a broader clinical picture, not a standalone diagnostic figure. Always integrate the clunk test result with patient history, other special test findings, and imaging results before drawing clinical conclusions.

Anatomy: Glenoid labrum and glenohumeral joint

Understanding the anatomy underlying the clunk test helps clinicians interpret findings and explain results to patients. The glenoid labrum is a ring of fibrocartilage attached to the rim of the glenoid, the socket of the shoulder joint. It deepens the socket, stabilizes the humeral head, and distributes load across the glenohumeral joint during movement.

• Superior Labrum (SLAP): Attaches to the long head of the biceps tendon. SLAP lesions commonly occur in overhead athletes from repetitive stress or sudden traction injuries.
• Anterior and Posterior Labrum: Stabilize the humeral head and prevent anterior/posterior translation during arm movement. Tears here reduce dynamic stability.
• Glenohumeral Joint: The articulation between the humeral head and glenoid. Labral tears increase abnormal joint motion and stress on supporting structures.

When the labrum is torn, the shoulder loses both mechanical stability and proprioceptive feedback. During the clunk test, a torn labral edge or loose piece may shift suddenly as the examiner applies anterior force and rotates the humerus. This produces the characteristic “clunk” sound that signals a positive test. That mechanism is why the clunk test remains a practical bedside screening tool.

How to perform the test: Step-by-step procedure

The clunk test is straightforward to perform and requires no special equipment. Below is the standard procedure clinicians use to assess labral integrity during shoulder examination.

Patient positioning

• Position the patient supine on the examination table.
• The shoulder to be tested should be at the table edge, allowing free arm movement.
• Ask the patient to relax their arm and shoulder musculature. Tension reduces test sensitivity.

Examiner positioning and hand placement

• Stand beside the table at the patient’s shoulder level, facing the patient.
• Place one hand on the posterior aspect of the humeral head, applying gentle anterior-directed pressure.
• Grasp the patient’s upper arm with your other hand, above the elbow, to control arm movement.

The maneuver: Abduction, anterior force, and rotation

• Fully abduct the shoulder overhead, varying the angle through the range to assess different segments of the labrum.
• Externally rotate the humerus while maintaining anterior pressure on the posterior humeral head.
• Perform slow, controlled rotation, avoiding rapid jerking movements that may startle the patient.
• Listen and feel for a clunking, clicking, or grinding sound or sensation as the labral tear, if present, shifts during rotation.

The entire maneuver should take 5-10 seconds. A skilled examiner performs the test smoothly while maintaining constant communication with the patient about discomfort or unusual sensations.

Interpreting a positive clunk test

A positive clunk test is indicated by a distinct clunking, grinding, or clicking sensation felt or heard during the maneuver. This sound typically suggests a mechanical disruption. A torn labral edge may be shifting within the joint space as the humerus rotates.

• True Positive: A clearly audible or palpable clunk accompanied by pain or apprehension suggests labral pathology.
• Equivocal Finding: Subtle clicking without clear mechanical catching may represent labral fraying or early pathology. Follow up with other tests and imaging if clinically indicated.
• Negative Test: Smooth rotation with no unusual sound or sensation suggests intact labrum, though absence of a clunk does not completely rule out labral pathology.

Always contextualize the clunk test result within the broader clinical picture. A patient with a positive clunk test but no symptoms of instability, catching, or overhead pain may not require immediate imaging. A negative clunk test combined with a positive comprehensive shoulder assessment may still warrant imaging, especially when the patient reports catching.

Assessing posterior labral instability

No separately named “posterior clunk test” exists in the literature. The clunk test itself has only one documented direction of force. The examiner presses anteriorly against the posterior humeral head. Its only variation is the abduction angle. Examiners “circle the shoulder” through different degrees of abduction to assess different segments of the labrum. Walsh also described a horizontal-adduction relocation variant.

Posterior labral lesions and posterior instability are instead assessed with two separately named tests: the jerk test and the Kim test.

• Jerk test (Matsen, 1990): The patient sits or stands with the shoulder abducted 90 degrees and the elbow flexed 90 degrees. The examiner axially loads the humerus while horizontally adducting the arm across the body. A sudden posterior subluxation, often felt as a jerk or clunk, signals posterior instability.
• Kim test (Kim et al., 2005): The patient sits with the arm abducted 90 degrees. The examiner axially loads the humerus while diagonally elevating the arm 45 degrees and applying a posteroinferior force to the proximal humerus. Sudden posterior shoulder pain, with or without a clunk, is a positive result.

Kim et al. (2005) verified findings by arthroscopy in 172 shoulders. They reported the Kim test at 80% sensitivity and 94% specificity, and the jerk test at 73% sensitivity and 98% specificity, for posteroinferior labral lesions. Some sources describe a “posterior clunk” as a sign of posterior instability, not a named clunk-test variant. It differs from the anterior clunk test this article covers.

Related shoulder special tests

The clunk test is one of several special tests available to assess shoulder pathology. Understanding how it compares to related tests helps clinicians build a comprehensive assessment battery and improve diagnostic accuracy.

O’Brien test

The O’Brien test, also called the active compression test, is performed with the patient seated. The arm is forward-flexed 90 degrees and internally rotated, with the thumb pointing downward. A positive result is pain with the arm supinated that improves when pronated, suggesting SLAP involvement.

Reported sensitivity for the O’Brien test varies by population and study. It can also reproduce AC joint pain, making it less specific for labral pathology alone.

Crank test

The crank test involves positioning the arm at 160 degrees of elevation in the scapular plane, seated or standing, then externally rotating the humerus. Grinding, clicking, or pain reproduction during this movement suggests SLAP involvement. Reported sensitivity for the crank test also varies by population and study. It complements the clunk test in a comprehensive shoulder assessment.

Sensitivity, specificity, and diagnostic accuracy

Evidence for the clunk test’s diagnostic accuracy is limited. Well-validated sensitivity and specificity data specific to the clunk test are not currently available in the peer-reviewed literature. Clinicians should treat it as one part of a broader clinical picture, not a standalone diagnostic figure.

The clunk test itself has not been the subject of a published diagnostic-accuracy study. Related maneuvers used in the same throwing-athlete population have been studied. This gives useful context, even though the numbers below do not describe the clunk test.

These figures come from Nakagawa et al. (2005), published in Arthroscopy (21:1290-1295). The study evaluated the forced shoulder abduction and elbow flexion test against arthroscopy in 54 competitive throwing athletes. It also reported accuracy for the crank test and O’Brien’s test.

That study did not evaluate the clunk test, and no comparable diagnostic-accuracy study of the clunk test has been published. Pair the clunk test with the O’Brien test and the crank test rather than relying on it alone.

How Pabau supports shoulder assessment documentation

Documenting special test findings accurately and consistently across your practice supports continuity of care and informed clinical decisions. Paper-based assessment forms are error-prone and hard to track over time. Practice management software like Pabau replaces them with digital intake forms and custom assessment templates.

These let you record clunk test results, patient positioning, and examiner observations in one place. Clinical interpretation stays attached to that same unified patient record.

Pabau Scribe, our AI scribe, can draft assessment summaries from your typed or dictated notes, reducing paperwork after each exam. The clunk test template above integrates with Pabau’s client record system. You can store and retrieve structured assessment data alongside treatment plans and imaging reports.

Streamline how your practice documents shoulder assessments and tracks patient outcomes with integrated clinical documentation software. Automating assessment templates and centralizing patient records cuts down on paperwork and keeps every provider’s notes consistent.

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See how Pabau's digital forms and AI-assisted clinical notes help you document special tests like the clunk test faster. Track patient progress accurately and reduce administrative overhead.

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Conclusion

The clunk test remains a practical, equipment-free screening tool for detecting glenoid labral pathology in the clinical setting. When performed correctly and interpreted within context, it provides valuable information to guide imaging decisions and treatment planning. However, remember that sensitivity varies across populations. Never rule out labral involvement based on a negative clunk test alone.

Documenting your clunk test findings systematically keeps trends visible to you and your team over time. Structured digital assessment templates in your practice management system support evidence-based practice and improve patient handoff communication.

Download the free clunk test template above to standardize how your practice records shoulder assessment findings. Book a demo to see how Pabau streamlines clinical documentation for teams like yours.

Continue your research

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Frequently asked questions