New Contralateral Shoulder Pain Does NOT Necessarily Signal Myelopathy Onset
In this patient with severe congenital stenosis (8mm AP diameter) and existing unilateral radiculopathy, new contralateral shoulder pain and tenderness most likely represents progression to bilateral radiculopathy rather than myelopathy, unless accompanied by specific upper motor neuron signs or functional deficits.
Critical Distinction: Radiculopathy vs. Myelopathy
The key issue here is distinguishing between:
- Bilateral radiculopathy (nerve root compression at multiple levels)
- True cervical spondylotic myelopathy (CSM) (spinal cord dysfunction)
What You Must Look For to Diagnose Myelopathy
Myelopathy requires upper motor neuron signs and functional deficits, not just pain 1:
Motor dysfunction:
- Decreased hand dexterity (difficulty with buttons, writing, chopsticks)
- Gait instability or broad-based gait
- Lower extremity weakness or stiffness
Sensory changes:
- Diffuse sensory loss (not dermatomal)
- Loss of proprioception
Pathological reflexes:
- Hyperreflexia
- Positive Hoffman's sign
- Positive Babinski sign
- Clonus
Important caveat: Myelopathic signs may be absent in approximately 20% of patients with true myelopathy 2, but pain and tenderness alone are NOT myelopathic symptoms.
Why This Likely Represents Bilateral Radiculopathy
Half of patients with cervical myelopathy also have concurrent radiculopathy 3. In that study of 127 myelopathy patients, 51.9% had combined radiculopathy, characterized by higher arm pain scores (VAS). The distinguishing feature was arm pain, not the presence of myelopathy itself.
Your patient's presentation—pain and tender skin in both shoulders—is consistent with dermatomal radicular symptoms from multilevel foraminal narrowing, not cord compression symptoms 4.
The Congenital Stenosis Factor: High Risk But Not Diagnostic
Your patient's 8mm AP diameter represents severe congenital cervical stenosis (CSS) 5. CSS is defined as spinal cord occupation ratio ≥70% on MRI, and patients with CSS:
- Develop myelopathy at younger ages
- Have greater baseline impairment when myelopathy develops
- Show worse baseline severity scores (modified JOA, Nurick, NDI)
However, CSS patients can have prolonged radiculopathy without myelopathy 5. The 10-month duration of symptoms doesn't automatically indicate myelopathy progression.
What to Do Next: Algorithmic Approach
1. Perform Focused Myelopathy Examination
- Test hand dexterity (10-second grip-release test, coin test)
- Assess gait (tandem walking, heel-toe)
- Check for hyperreflexia, Hoffman's, Babinski
- Evaluate lower extremity function
2. If Myelopathy Signs Present:
- Urgent MRI (if not recent) to assess for cord signal changes 6, 2
- T2 hyperintensity = worse prognosis
- T1 hypointensity = advanced disease
- Prompt referral to spine surgeon 1—delay causes long-term disability
3. If No Myelopathy Signs:
- This represents bilateral radiculopathy progression
- Consider electrophysiological testing (MEP, EMG) to differentiate from early myelopathy 2
- Conservative management may still be appropriate
- Close monitoring for myelopathy development (3% annual risk with significant stenosis) 2
Common Pitfall to Avoid
Do not assume bilateral symptoms = myelopathy. Recent evidence shows that contralateral symptoms can develop after surgical treatment of unilateral radiculopathy due to biomechanical changes 7, and bilateral radiculopathy is common in multilevel disease 3, 8. The critical error is missing true myelopathy by focusing only on pain rather than functional deficits.
ICD-10 coding studies show that 18-22% of patients coded for radiculopathy actually have concurrent myelopathy 8, emphasizing the need for careful clinical examination rather than relying on symptom distribution alone.
Bottom Line
Pain and tenderness spreading to the second shoulder, in isolation, represents progression of multilevel radiculopathy, not myelopathy onset. However, given the severe congenital stenosis (8mm), this patient requires immediate examination for upper motor neuron signs and functional deficits. If any are present, urgent surgical referral is indicated 1. If absent, close monitoring with low threshold for repeat imaging is warranted given the 3% annual myelopathy risk 2.