Objective To investigate the efficacy and safety of ultrasound-guided percutaneous needle-knife puncture combined with double-needle suction for the treatment of calcific supraspinatus tendinitis.Methods Sixty patients with calcified supraspinatus tendinitis were selected and divided into control group and observation group randomly

30 cases in each group.Patients in the control group was treated by a needle-knife combined with single-needle percutaneous suction under the guidance of ultrasound

while the observation group was treated by a needle-knife combined with double-needle percutaneous suction.The degree of pain was evaluated by numerical rating scale（NRS）

the shoulder function and range of motion were evaluated using the university of California at Los Angeles shoulder rating scale（UCLA） and the Constant-Murley Shoulder Function Score System before treatment and 3 d

7 d

1 month and 6 months after treatment.The results of DR examination and the ratio of second and third treatments were compared between two groups.The incidence of adverse reactions during treatment and follow-up was also recorded.Results There was no significant difference in terms of NRS socre between two groups before treatment.At 3 d and 7 d after treatment

the NRS score of the observation group were lower than that of the control group（both P<0.05）.At 1 month and 6 months after treatment

the NRS scores of the two groups were not significantly different.There were no significant differences in UCLA score and Constant-Murley score between two groups before and after treatment.The results of DR in the observation group showed that the calcifications decreased or disappeared at 7 d after treatment.The ratio of second and third treatment of the observation group were significant lower than the control group（both P<0.05）.There was no significant difference in the incidence of adverse reactions between the two groups during treatment.Conclusion Compared with the traditional ultrasound-guided needle-knife combined with single-needle percutaneous suction

ultrasound-guided needleknife combined with double-needle percutaneous suction for treatment of calcified supraspinatus tendinitis can reduce pain of patients in the early stage

with significant therapeutic effects and good safety.