Correction to: In shoulder adhesive capsulitis, ultrasound-guided anterior hydrodilatation in rotator interval is more effective than posterior approach: a randomized controlled study

Correction to: Clinical Rheumatology

10.1007/s10067-020-05131-2

Following publication of our article [1], it was brought to our attention that the machine used to generate the ultrasound image in Fig. 2 was not referenced in the main body of text. We would like to clarify that the intervention was performed using the Mindray Te7 color Doppler machine with a linear, high-frequency 6–14 MHz probe and that SAMSUNG MEDISON (UGEO H60) using linear, high-frequency probes (7.5–12 MHz) was used for the shoulder evaluation. The Interventions section has been updated as follows:

Interventions

The enrolled patients were randomly divided by an external researcher into two groups of 32 patients each, according to the injection approach in the rotator interval. Randomization was carried out by the computer-generated block randomization. An independent external researcher without any contact with any of the patients carried out this randomization and allocation.

The ratio between group I patients who received ultrasound-guided hydrodilatation with corticosteroid, saline, and local anesthetic via posterior approach and group II patients who received ultrasound-guided hydrodilatation via anterior rotator interval approach was 1:1.

Complete information about the allocated group was given to the research assistants in sequential numbering in closed envelopes. Group allocation was completely blinded to the principal investigator and outcome assessors. In addition, the statistician was blinded to participants till data analysis.

The intervention was performed by the Mindray Te7 color Doppler machine with a linear, high-frequency 6–14 MHz probe.

Both groups were injected ultrasound-guided by an expert radiologist with 1 ml methyl-prednisolone acetate (40 mg), 1 ml of 2% lidocaine, and 15 ml saline under strict aseptic conditions with total of 17 ml; both groups received the same injectable materials in the same amount.