What Is a Diagnostic Local Anaesthetic Injection?
If your pain improves immediately after the injection, it confirms that the injected area is the true cause of your symptoms.
These injections are used when the diagnosis is unclear or when several structures could be contributing to the pain.
Why Diagnostic Injections Work
Local anaesthetic temporarily numbs the targeted area. This allows us to:
Confirm which structure is generating the pain
Distinguish between multiple possible causes
Guide the most appropriate treatment
Avoid unnecessary procedures or imaging
Plan rehabilitation more effectively
Because the anaesthetic acts quickly, we can assess your movement or symptoms immediately after the injection to see how much the pain changes.
Who Are Diagnostic Injections Suitable For?
These injections are helpful when:
Pain could be coming from more than one structure
(e.g., shoulder pain from bursa or rotator cuff; hip pain from GTPS or the joint)MRI or ultrasound findings don’t perfectly match your symptoms
Pain has not responded to previous treatment
A clear diagnosis is needed before deciding on:
steroid injections
surgery
hyaluronan
targeted physiotherapy
You need clarity about whether a problem is coming from a joint, tendon, or nerve
You want to understand which movements or activities are safe
Diagnostic injections provide clarity when the source of pain is uncertain.
Why Ultrasound Guidance Is Important
Diagnostic injections must be performed with absolute accuracy to ensure the correct structure is numbed.
Ultrasound guidance provides:
Real-time visualisation of the needle
Precise placement into the exact structure being tested
Increased diagnostic accuracy
Avoidance of nearby nerves, vessels, or tendons
Immediate confirmation that the medication has reached the right area
Accurate placement is essential — otherwise the test is unreliable.
Ultrasound ensures the results are meaningful and trustworthy.
