Is corticosteroid injection (a “block”) effective for thumb trigger finger?

In daily life, we encounter numerous situations and problems—some of which can be resolved, while others cannot. Just as in modern medicine, many issues remain unresolved; yet as time progresses and society advances, new challenges continue to emerge. For instance, many people are unfamiliar with what a “steroid injection” (also known as a “block injection”) is or its purpose. So, is administering a steroid injection an appropriate treatment for thumb tenosynovitis?

Is a Steroid Injection Appropriate for Thumb Tenosynovitis?

A steroid injection is generally considered effective for thumb tenosynovitis. This condition is one of the most common clinical disorders, characterized by sterile inflammation resulting from repeated friction between the tendon and its surrounding tendon sheath. Symptoms typically include localized pain and swelling. If the tendon sheath becomes narrowed, it may further restrict thumb flexion and extension.

Steroid injections should be used sparingly and avoided long-term, as prolonged or repeated use may increase the risk of tendon adhesions within the body. During recovery, local immobilization is essential—avoid frequent or excessive thumb movement. In cases of severe pain, nonsteroidal anti-inflammatory drugs (NSAIDs) may be prescribed by a physician. Patients with tenosynovitis should pay special attention to proper hand and wrist positioning during routine household activities such as laundry, cooking, knitting, and cleaning. They should avoid excessive flexion or extension of the fingers and wrists, and refrain from lifting heavy objects.

In daily life, patients should maintain a positive attitude, actively cooperate with medical treatment, take medications as prescribed—both on schedule and in correct dosage—and prioritize daily self-care to promote faster recovery. We hope this information proves helpful to you.