Pearls for Carpal Tunnel Steroid Injection 1. The patient may be seated or supine in position. 2. Use a rolled towel to supinate the affected wrist in slight dorsiflexion. Tap the fingers down. 3. Introduce the needle in the ulnar aspect of carpal tunnel. 4. Inject the anterior aspect of medial side of nerve. 5. Now, inject the posterior aspect of nerve. 6. Make sure the injectate completely surrounds the nerve.