Injection Sclerotherapy has helped a lot of my patients, though it's a bit expensive.
The importance of ultrasound is by the fact that it causes vibrational trauma and thus, more immune cells usher to the area to restart the repair process.

So this is useful in only chronic supraspinatus tendinitis which is rightly called supraspinatus tendinopathy.

I have written some articles clearly explaining and differentiating these conditions, kindly read and let me know if you find them useful.

Supraspinatus Tendon - Tendinitis, Tendinosis, and Tear