Hand Tremor Following Steroid Injection with Localized Swelling
The hand shaking is most likely caused by direct nerve injury from the steroid injection, particularly if the injection was inadvertently administered intrafascicularly into a peripheral nerve (median or ulnar nerve), and the "goose egg" represents either a hematoma or localized inflammatory reaction at the injection site.
Mechanism of Injury
The tremor/shaking represents nerve dysfunction from one of three mechanisms:
Direct neurotoxic injury: Intrafascicular injection of corticosteroids causes direct axonal and myelin degeneration 1. The degree of damage varies by steroid type—dexamethasone causes minimal damage while hydrocortisone and triamcinolone cause widespread nerve fiber destruction 1.
Nerve compression: The hematoma ("goose egg") may be compressing adjacent nerves, causing tremor and dysfunction.
Vascular injury: Inadvertent intra-arterial injection can cause arterial spasm and distal limb ischemia, leading to neuromuscular dysfunction 2.
Immediate Work-Up
Perform this evaluation urgently (within 24 hours):
Clinical Assessment
- Sensory examination: Map out the exact distribution of any numbness, tingling, or dysesthesias to identify which nerve(s) are affected (median vs. ulnar vs. radial)
- Motor examination: Test individual muscle groups innervated by each nerve—look for weakness beyond just the tremor
- Vascular examination: Check radial and ulnar pulses, capillary refill, and skin temperature/color to rule out arterial injury 2
- Inspection: Measure the size of the hematoma and assess for signs of infection (warmth, erythema, purulence) 3
Imaging
- Ultrasound of the injection site: First-line imaging to evaluate hematoma size, rule out abscess formation, and assess nerve compression
- MRI of the hand/wrist: If nerve injury is suspected and symptoms are severe or progressive—shows nerve edema, hematoma extent, and soft tissue changes
Electrodiagnostic Studies
- Nerve conduction studies and EMG: Obtain at 3-4 weeks post-injury (not acutely, as Wallerian degeneration takes time). This establishes baseline nerve function and severity of injury 4.
Critical Red Flags Requiring Urgent Intervention
Watch for these complications that require immediate surgical consultation:
- Progressive motor weakness: Suggests expanding hematoma with nerve compression
- Signs of infection: Fever, purulent drainage, spreading erythema—can lead to suppurative tenosynovitis or necrotizing fasciitis 5, 3
- Vascular compromise: Pale, cold digits with absent pulses indicate arterial injury requiring immediate vascular surgery 2
- Severe, unrelenting pain: May indicate compartment syndrome or acute nerve ischemia
Management Algorithm
If Nerve Injury Without Compression (Most Likely Scenario)
- Observation: Most injection injuries improve with time if the injection was epifascicular rather than intrafascicular 4
- Hand therapy: Early mobilization once acute pain subsides
- Follow-up: Reassess at 2 weeks, 6 weeks, and 3 months
- Electrodiagnostic studies: At 3-4 weeks to establish prognosis
If Hematoma With Nerve Compression
- Urgent hand surgery referral: Surgical decompression and hematoma evacuation may be needed if symptoms are progressive 4
- Neurolysis: If direct nerve injection is confirmed at surgery, debridement of injected steroid material improves outcomes 4
If Infection Suspected
- Immediate surgical consultation: Suppurative tenosynovitis requires urgent irrigation and debridement 5, 3
- IV antibiotics: Start empirically while awaiting cultures
If Vascular Compromise
- Immediate vascular surgery consultation: Arterial spasm from intra-arterial steroid injection requires urgent treatment with vasodilators, anticoagulation, or surgical intervention 2
Common Pitfalls
The literature emphasizes that injection technique is critical—only intrafascicular injection causes permanent nerve damage 1. The patient should have been warned to report paresthesias immediately during injection, as this indicates needle contact with nerve and requires immediate redirection 4.
Prognosis: Even with documented nerve injury requiring surgical neurolysis, patients show significant improvement over 1-11 years, though some permanent functional loss may persist 4. The key is early recognition and appropriate intervention when indicated.