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<正>Introduction Ultrasound is an easy-to-use imaging tool in diagnosing soft tissue lesions and in performing ultrasound-guided injections.Most importantly,it is radiation-free.Our previous studies have documented that ultrasound can be applied in performing accurate musculoskeletal injections such as caudal epidural,piriformis, and sacroiliac joint injections.We have extended the usage of ultrasound-guided injection technique to treat