Carpal Tunnel Injection

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Carpal Tunnel Injection
Indication Carpal Tunnel Syndrome
Syringe 1mL
Needle 23G 30mm
Local nil
Volume 0.5mL


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. The FCU attaches to the pisiform. The distal wrist crease crosses the pisiform




The injection of 5mLs of D5W was more effective than corticosteroid in one RCT.[1] Some authors have reported using 10mLs.[2]


  • 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
  • Have patient open and close hand to spread the injectate around the carpal tunnel.


Mild exacerbation of symptoms immediately or in the hours following injection. Soft tissue atrophy. Ulnar artery injury. Median nerve injury.


Rest for one week. Use a night splint. Repeat injections can be done.


Carpal Tunnel Injection Video

See Also

External Links


  1. โ†‘ Wu et al. Randomized double-blinded clinical trial of 5% dextrose versus triamcinolone injection for carpal tunnel syndrome patients. Annals of neurology 2018. 84:601-610. PMID: 30187524. DOI.
  2. โ†‘ Tsung-Ying Li, Si-Ru Chen, Yu-Ping Shen, Chih-Ya Chang, Yu-Chi Su, Liang-Cheng Chen, Yung-Tsan Wu, Long-term outcome after perineural injection with 5% dextrose for carpal tunnel syndrome: a retrospective follow-up study, Rheumatology, , keaa361,

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