Diagnostic Injection Strategy

Injections are not only treatments—they are powerful diagnostic tools. When used correctly, they can identify the true source of shoulder pain and guide the next step in care.

Dr. Streit uses injections as part of a diagnosis-driven strategy, not as a default treatment.

Why diagnosis matters

Shoulder pain does not always come from a single source. Pain may originate from:

• Rotator cuff
• Biceps tendon
• Glenohumeral joint
• AC joint
• Capsule (stiffness)
• Cervical spine (referred pain)

Treating the wrong structure leads to failed injections, unnecessary procedures, and delayed recovery.

Using injections to identify the pain generator

A properly placed injection can help confirm whether a specific structure is responsible for a patient’s pain.

For example:

• Joint injection → arthritis-related pain
• Subacromial injection → rotator cuff-related pain
• Biceps sheath injection → biceps tendon pathology
• AC joint injection → localized AC joint pain

If pain improves after injection, it provides strong evidence that the targeted structure is the source of symptoms.

Why this matters before surgery

Before recommending surgery, it is critical to confirm that the identified problem is actually causing the patient’s pain.

Diagnostic injections help:

• Confirm the correct diagnosis
• Avoid unnecessary surgery
• Improve surgical planning
• Set realistic expectations

This is especially important in patients with multiple findings on MRI, where not every abnormality is clinically significant.

Not all injections are treatment injections

Some injections are designed to reduce inflammation. Others are designed purely to gather information.

Understanding the purpose of the injection changes how it is performed, how results are interpreted, and how the next step is decided.

What this means for patients

If an injection is recommended, the most important question is not “Will this fix the problem?” but “What will this tell us?”

A well-planned diagnostic injection can provide clarity, reduce uncertainty, and lead to a more precise treatment plan.

The goal is not to perform more injections—it is to use injections intelligently to arrive at the correct diagnosis and the right treatment.