Do Not Immobilize the Thumb After CMC Joint Injection
Immobilization after CMC joint injection is actively discouraged—patients should avoid overuse for only 24 hours but should maintain normal activity otherwise. 1
The Evidence Against Immobilization
The most recent and highest-quality guidance comes from the 2021 EULAR recommendations for intra-articular therapies, which explicitly states: "Avoid overuse of injected joints for 24 hours following IAT; however, immobilisation is discouraged" with 94% agreement and Level 1B evidence 1. This represents the strongest evidence available on post-injection care.
Why Immobilization Doesn't Help
Studies examining 24-48 hour post-injection immobilization (including bed rest, joint splinting, or bandages) have consistently shown no added benefit compared to normal activity after intra-articular therapy 1. The evidence base includes multiple studies across different joints and even when injecting radioisotopes, where theoretical concerns about medication leakage exist.
Practical Post-Injection Instructions
What to tell your patient:
- Avoid heavy use or strenuous activities with the thumb for the first 24 hours
- Resume normal daily activities as tolerated after the first day
- Do not apply a splint or rigid immobilization device
- Light movement and normal hand use is encouraged
The Role of Orthoses in CMC OA Management (Separate from Injection)
It's critical to distinguish post-injection care from the general management of CMC osteoarthritis. Orthoses ARE strongly recommended as part of overall CMC OA treatment 2, with the 2020 ACR/AF guidelines giving a strong recommendation for first CMC joint neoprene or rigid orthoses 2. However, this is for ongoing symptom management, not specifically post-injection immobilization.
When Orthoses Are Appropriate:
- As part of comprehensive conservative management
- Long-term use (at least 3 months) for sustained benefit 3
- Custom-fitted by a specialized health professional
- Either short (CMC only) or long (including MCP) designs are effective 4, 5
Common Pitfall to Avoid
Do not confuse the recommendation for orthoses as part of general CMC OA management with post-injection immobilization. These are separate clinical decisions. The injection itself does not require subsequent immobilization, even though the patient may benefit from orthotic use as part of their broader treatment plan.
The 2021 EULAR guidelines represent the most current, evidence-based approach with the highest level of agreement among international experts specifically addressing the question of post-injection care 1.