What is the differential diagnosis for a positive Spurling's test?

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Differential Diagnosis for Positive Spurling's Test

A positive Spurling's test is highly specific for cervical radiculopathy (93% specificity), making this the primary diagnosis to consider, though the test's low sensitivity (30%) means a negative result does not exclude the condition. 1

Primary Diagnosis: Cervical Radiculopathy

When Spurling's test is positive (reproducing pain or tingling that radiates from the shoulder distally to the elbow), cervical radiculopathy should be the leading diagnosis. 1 The test demonstrates high specificity but low sensitivity, meaning it is clinically useful for confirming rather than screening for radiculopathy. 2, 1

Common Etiologies of Cervical Radiculopathy:

  • Herniated cervical disc - the most common cause of cervical neuropathic pain with radicular symptoms 3
  • Cervical osteophyte formation - degenerative changes causing nerve root compression 3
  • Foraminal stenosis - narrowing of the neural foramen from degenerative spine disease 4

Broader Differential Considerations

The ACR guidelines emphasize that cervical pain has multiple potential sources beyond radiculopathy that must be considered: 3

Musculoskeletal Causes:

  • Myofascial pain syndrome - characterized by active trigger points in trapezius and other cervical muscles, though Spurling's test is less commonly positive (only 16.6% in normal subjects) 4, 1
  • Facet joint arthropathy - mechanical pain from facet joints 3
  • Cervical disc degeneration without radiculopathy - discogenic pain 3

Neurological Causes Beyond Radiculopathy:

  • Cervical myelopathy - requires separate evaluation and should be excluded by examination 3
  • Brachial plexopathy - must be differentiated from radiculopathy 3

Red Flag Conditions (Require Urgent Evaluation):

The ACR guidelines recommend considering these serious etiologies: 3

  • Tumor - primary or metastatic spinal lesions
  • Infection - discitis, osteomyelitis, epidural abscess
  • Inflammatory conditions - ankylosing spondylitis, rheumatoid arthritis
  • Vascular causes - vertebral artery dissection

Diagnostic Approach

Use the SPASIBO diagnostic complex for optimal accuracy (94.7%) in confirming cervical radiculopathy: 5

  • Spurling test (positive)
  • Pain pattern (dermatomal distribution)
  • Adduction test (shoulder abduction relief)
  • Strength deficiency (motor weakness in specific myotome)
  • Ipidacrine response (not routinely used)
  • Brachial plexus tension (Upper Limb Tension Test - ULTT)
  • Other findings

Key Clinical Distinctions:

  • Weakness of abductor pollicis brevis differentiates disc-root conflict from myofascial pain syndrome 4
  • Triceps reflex abnormalities help distinguish disc-root conflict from degenerative spine disease 4
  • Positive Spurling's test occurs in 56.7% of disc-root conflict cases but only 40% of certain radiculopathy cases 4, 1

Common Pitfalls

  • Do not use Spurling's test as a screening tool - its low sensitivity (30%) makes it inadequate for ruling out radiculopathy 1
  • Positive results in 16.6% of normal patients - false positives occur, requiring correlation with other clinical findings 1
  • Spurling's test alone is insufficient - combine with motor testing, reflex examination, sensory testing, and other provocative maneuvers for accurate diagnosis 5, 4
  • Consider non-radicular causes even with positive Spurling's test if clinical presentation is atypical 3

References

2
Research

A systematic review of the diagnostic accuracy of provocative tests of the neck for diagnosing cervical radiculopathy.

European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2007

3
Guideline

acr appropriateness criteria<sup>®</sup> cervical neck pain or cervical radiculopathy.

Journal of the American College of Radiology, 2019

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