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Updated: Mar 24, 2026
Author Spotlight: Treating Frozen Shoulder with Small Needle Knife Therapy
Published on: November 17, 2023
Intra-articular injection, subacromial injection, and hydrodilatation for primary frozen shoulder: a randomized
Jong Pil Yoon1, Seok Won Chung2, Ju-Eun Kim1
1Department of Orthopaedic Surgery, School of Medicine, Kyungpook National University, Daegu, South Korea.
Background:
The aim of this prospective randomized study was to compare the efficacy of 3 injection methods, intra-articular injection, subacromial injection, and hydrodilatation (HD), in the treatment of primary frozen shoulder.
Methods:
Patients with primary frozen shoulder were randomized to undergo intra-articular injection (n = 29), subacromial injection (n = 29), or HD (n = 28). Evaluations using a visual analog scale for pain, Simple Shoulder Test, Constant score, and passive range of shoulder motion were completed before treatment and 1 month, 3 months, and 6 months after treatment.
Results:
Among the 3 injection methods for primary frozen shoulder, HD resulted in a greater range of motion in forward flexion and external rotation, a lower visual analog scale score for pain after 1 month, and better outcomes for all functional scores after 1 month and 3 months of follow-up. However, there were no significant differences in any clinical outcomes among the 3 groups in the final follow-up at 6 months.
Conclusions:
Although HD yielded more rapid improvement, the 3 injection methods for primary frozen shoulder resulted in similar clinical improvement in the final follow-up at 6 months.
