What lidocaine dose and volume should be used for intra‑articular and subacromial shoulder injections in an adult?

Lidocaine Dosing for Shoulder Injections

For adult shoulder injections (intra-articular or subacromial), use 4-10 mL of 1% lidocaine (40-100 mg total), staying well below the maximum safe dose of 4.5 mg/kg without epinephrine or 7 mg/kg with epinephrine. 1

Recommended Volumes and Concentrations

Standard Approach

• 1% lidocaine (10 mg/mL): 4-10 mL total volume 2, 3
  • Low-volume technique: 4 mL (40 mg lidocaine) 2
  • High-volume technique: 10 mL (100 mg lidocaine) 2
  • Both volumes demonstrate equivalent pain relief and functional outcomes 2

Specific Injection Techniques

• Subacromial injections: Typically 4-10 mL of 1% lidocaine combined with corticosteroid 2, 3
• Intra-articular injections: 20 mL of 1% lidocaine (200 mg) has been used successfully for shoulder dislocation reductions 4
• Diagnostic lidocaine test: 1 mL of 1% lidocaine (10 mg) can be used initially to confirm proper needle placement before corticosteroid injection 3

Maximum Safe Doses

Adults

• Without epinephrine: 4.5 mg/kg (maximum 300 mg total) 1, 5
• With epinephrine: 7.0 mg/kg 6, 1

For a 70 kg adult, this translates to:

• Without epinephrine: 315 mg maximum (31.5 mL of 1% lidocaine) - use 300 mg practical maximum 5
• With epinephrine: 490 mg maximum (49 mL of 1% lidocaine)

Dose Calculation Considerations

• Use ideal body weight for obese patients (BMI >30 kg/m²) 7
  • Men: height (cm) - 100 7
  • Women: height (cm) - 105 7

Clinical Pearls and Safety Considerations

Volume Selection

• Low-volume injections (4 mL) are non-inferior to high-volume injections (10 mL) for pain relief and functional outcomes in subacromial impingement 2
• Lower volumes may reduce the theoretical risk of systemic absorption while maintaining efficacy 2

Combination with Corticosteroids

• Lidocaine is commonly mixed with triamcinolone (40-80 mg) for therapeutic shoulder injections 8, 2, 3
• A diagnostic lidocaine test injection (1 mL) before corticosteroid administration increases treatment success rates from 42% to 65% at 3 weeks 3

Important Safety Warnings

• Calculate maximum allowable dose before administration to prevent systemic toxicity 6
• Aspirate before injection to avoid intravascular administration 1
• Use incremental injections rather than rapid bolus 1
• Monitor for early toxicity signs: perioral tingling, tinnitus, lightheadedness, metallic taste 6

Timing Considerations

• Avoid combining with other local anesthetic interventions within 4 hours 7
• If performing nerve blocks, wait 4 hours after any intravenous lidocaine use 7

Concentration Conversion Reference

For practical dosing calculations 6:

• 1% lidocaine = 10 mg/mL
• 2% lidocaine = 20 mg/mL
• 0.5% lidocaine = 5 mg/mL

Common Pitfalls to Avoid

• Do not exceed 300 mg total dose in a single treatment session for adults without epinephrine 5
• Avoid using higher concentrations than necessary - 1% lidocaine is typically sufficient for shoulder injections 2, 3, 4
• Do not perform injection if patient has true lidocaine allergy - consider ester-type anesthetics or diphenhydramine alternatives 1
• Lower doses should be used in highly vascular areas to reduce systemic absorption risk 6