Why would arimidex cause trigger finger and is this condition harmful?

I am very confused. I know it can cause joint pain.

But trigger finger is caused by:

Causes
By Mayo Clinic staff

"The cause of trigger finger is a narrowing of the sheath that surrounds the tendon in the affected finger. Tendons are fibrous cords that attach muscle to bone. Each tendon is surrounded by a protective sheath — which in turn is lined with a substance called tenosynovium. The tenosynovium releases lubricating fluid that allows the tendon to glide smoothly within its protective sheath as you bend and straighten your finger — like a cord through a lubricated pipe.

But if the tenosynovium becomes inflamed from repetitive strain injury or overuse or due to inflammatory conditions, such as rheumatoid arthritis, the space within the tendon sheath can become narrow and constricting. The tendon can't glide through the sheath easily, at times catching the finger in a bent position before popping straight. With each catch, the tendon itself becomes irritated and inflamed, worsening the problem. With prolonged inflammation, scarring and thickening (fibrosis) can occur and bumps (nodules) can form."

I find in the articles that I have read that it can cause joint pain. I do not find tendon pain.
Please correct me if I am wrong . I would love to read an article that that shows Tendon problems are caused by this drug.

I wish you all the best.