What should be done if a patient experiences a tingling sensation during a shoulder injection?

Immediate Action: Stop the Injection and Withdraw the Needle

If a patient experiences tingling during a shoulder injection, you must immediately stop advancing the needle and withdraw it slightly or completely, as this indicates potential nerve contact or intraneural injection.

Understanding the Problem

Tingling during shoulder injection is a red flag symptom indicating the needle has contacted or is in dangerous proximity to a nerve structure. The shoulder region contains multiple nerves vulnerable during injection procedures, including:

• Axillary nerve (most commonly at risk during glenohumeral injections)
• Suprascapular nerve (during subacromial approaches)
• Musculocutaneous nerve (during anterior approaches)

Why This Matters for Patient Safety

Continuing to inject after experiencing paresthesias can result in:

• Direct nerve injury from mechanical trauma
• Intraneural injection causing chemical neuritis
• Permanent nerve damage with motor and sensory deficits
• Complex regional pain syndrome (CRPS) 1

This is a critical patient safety issue that directly impacts morbidity and quality of life.

Immediate Management Algorithm

Step 1: Stop and Assess

• Immediately cease injection if patient reports tingling, shooting pain, or electric sensation
• Do not inject any medication at this needle position
• Ask patient to describe the sensation and its distribution

Step 2: Needle Repositioning

• Withdraw the needle 2-3mm if you wish to attempt repositioning
• Completely remove the needle if symptoms are severe or persist
• Wait 30-60 seconds for symptoms to resolve before considering re-attempt

Step 3: Re-attempt Decision

• If tingling resolves completely with withdrawal: May re-attempt with different trajectory
• If tingling persists: Abort the procedure entirely
• Consider ultrasound guidance for any re-attempt to visualize neurovascular structures

Step 4: Post-Procedure Monitoring

• Document the paresthesia event thoroughly
• Assess neurological function before patient leaves
• Provide clear instructions to report any persistent numbness, weakness, or pain
• Schedule follow-up within 48-72 hours

Prevention Strategies

Proper Injection Technique

The evidence suggests technique matters significantly for safety 2, 3:

• Use anatomic landmarks carefully - The "Delaware posterior bone touch technique" shows higher accuracy than traditional approaches 2
• Aspirate before injecting to confirm proper placement
• Inject slowly - rapid injection increases risk of complications
• Never inject against resistance - this suggests intraneural or intratendinous placement 3

Key Technical Points

• Avoid injecting directly into tendons - inject into bursal spaces or joint space 3
• Maintain strict aseptic technique - infections after shoulder injections are debilitating 4
• Consider ultrasound guidance when available, especially for difficult anatomy 5

Common Pitfalls to Avoid

1. Ignoring patient symptoms: Never dismiss tingling as "normal" - it is not
2. Continuing to inject: This is the most dangerous error
3. Inadequate anatomic knowledge: Know the nerve locations for each approach
4. Poor needle angle: Improper trajectory increases nerve contact risk
5. Excessive force: If you meet resistance, stop and reassess

Special Considerations

When Nerve Block is Intended

If performing a suprascapular nerve block (which may be appropriate for hemiplegic shoulder pain 6), paresthesias may be expected but should still prompt caution. However, for standard therapeutic injections (corticosteroids, viscosupplementation), paresthesias are never acceptable.

Documentation Requirements

Document clearly:

• Exact location and depth when paresthesia occurred
• Patient's description of symptoms
• Your immediate response
• Neurological examination findings
• Patient education provided

Post-Injection Nerve Injury Management

If nerve injury is suspected after the procedure:

• Immediate neurological examination documenting motor and sensory deficits
• Consider early referral to neurology or orthopedic surgery if deficits persist beyond 48 hours
• Avoid repeat injections in the same area until full recovery
• Document thoroughly for medicolegal purposes

Follow-up Timeline

• 24-48 hours: Phone contact to assess symptoms
• 1 week: In-person evaluation if any persistent symptoms
• 4-6 weeks: Re-evaluation if symptoms continue; consider EMG/NCS studies

The fundamental principle is simple: tingling means stop immediately. No therapeutic benefit justifies risking permanent nerve injury.