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. Author manuscript; available in PMC: 2013 Apr 28.
Published in final edited form as: Clin Rheumatol. 2011 Jan 15;30(6):805–813. doi: 10.1007/s10067-010-1653-6

Figure 2. Sonographic Anatomy for Injection of the Carpal Tunnel.

Figure 2

This more distal transverse image confirms that the penetration point to the ulnar side of the median nerve will permit the needle to pierce the flexor retinaculum and dilate the carpal tunnel space by hydrodissection with 1% lidocaine, and avoiding intratendinous, intraarterial, or intraneural injection.