New Hydrodissection Treatment Offers Long-Term Relief for Carpal Tunnel Syndrome

A new clinical trial published in Radiology in October 2026 indicates that a 15-minute, steroid-free ultrasound-guided hydrodissection treatment offers long-lasting relief for carpal tunnel syndrome, potentially helping patients avoid surgery[1][5].

This development is significant because carpal tunnel syndrome affects 5% to 10% of the general population, with rising incidence rates[3][4][8]. Traditional steroid injections often provide only temporary relief and carry risks such as localized skin changes, fat thinning, and tendon weakening[1][3][10]. The new minimally invasive procedure could offer a safer, more durable alternative[1][5][8].

What the Records Show

Participants were divided into three groups: one receiving ultrasound-guided hydrodissection with normal saline, another receiving a traditional ultrasound-guided corticosteroid injection alone, and a third receiving hydrodissection with both saline and corticosteroid[4][5][9]. The hydrodissection procedure involves injecting sterile saline around the compressed median nerve in the wrist to free it from surrounding tissues[6][7].

All three treatment groups initially showed improvement[5]. However, at 12 weeks and 6 months (24 weeks) post-treatment, the hydrodissection groups demonstrated sustained clinical and morphological improvements[5][9]. In contrast, the corticosteroid-only group experienced a recurrence of symptoms[5][9]. Specifically, at 24 weeks, 85.7% of wrists treated with saline hydrodissection and 90.5% of those treated with hydrodissection plus corticosteroid achieved a clinically meaningful improvement in symptom severity[5][9]. None in the corticosteroid-only group maintained this level of improvement[5]. Pain scores in the hydrodissection groups significantly decreased and remained low, while returning to baseline by 24 weeks in the corticosteroid-only group[5].

Ultrasound findings supported these clinical results[5]. The median nerve's cross-sectional area reduced by approximately 43-45% following hydrodissection, compared to about 11% after corticosteroid injection alone[5][9]. The study also found that adding corticosteroids to the hydrodissection procedure did not provide any significant extra long-term benefit[5][8]. The procedure itself averaged 15 minutes and was well-tolerated by patients, with no significant immediate or delayed complications observed[5][8]. Only 8% of participants reported minor pain and swelling, which resolved within 3-4 days[5].

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