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Carpal Tunnel Injection
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| Carpal Tunnel Injection | |
|---|---|
| Indication | Carpal Tunnel Syndrome |
| Syringe | 1mL |
| Needle | 23G 30mm |
| Steroid | 20mg triamcinolone |
| Local | nil |
| Volume | 0.5mL |
Background
Injection for Carpal Tunnel Syndrome.
Anatomy
The flexor retinaculum attaches to four areas. Namely the pisoform, the scaphoid, the hook of the hamate, and the trapezium. The proximal edge lies at the distal wrist crease. The median nerve normally lies under the palmaris longus tendon (if present) at the mid wrist, and is medial to the flexor carpi radialis (FCR) tendon.
Technique
- Position:Hand palm up
- Needle entry site options
- Identify the midpoint along the proximal wrist crease, between the FCR and median nerve.
- Place your index pulp lateral to the pisiform, in line with the 4th finger, slide the finger proximally till the tip of your nail is on the distal nail crease, inject at the mid point of nail tip.
- Insert the needle then angle proximal to distal at a 45 degree angle.
- Slide distally until it is under the midpoint of the retinaculum (feel it puncture the retinaculum)
- Reposition medially if hit nerve
- Inject as a bolus
Complications
Mild exacerbation of symptoms immediately or in the hours following injection. Soft tissue atrophy. Ulnar artery injury. Median nerve injury.
Aftercare
Rest for one week. Use a night splint. Repeat injections can be done.
