This is a plain-English translation of the academic paper above, prepared for patients, referring clinicians, and other non-specialist readers. It preserves the structure of the original paper while removing technical jargon. For the full clinical paper, follow the PubMed or DOI links.
Background
How often a needle aimed at the acromioclavicular joint — the small joint at the top of the shoulder where the collarbone meets the shoulder blade — actually ends up inside the joint, when the injection is done by feel alone. We tested both an experienced specialist and a trainee, and then re-tested the specialist with x-ray (fluoroscopic) guidance.
Rationale
Injecting steroid or local anaesthetic into the acromioclavicular joint is one of the most common diagnostic and therapeutic procedures for shoulder pain. If the medication ends up around the joint rather than inside it, the patient may not get the relief they expected, and the diagnostic value of the injection is lost. The joint is small and not always easy to find by feel.
Results
Of 76 blind injections in cadaveric joints, 43% missed the joint — the specialist’s miss rate (42%) was almost the same as the trainee’s (45%). With x-ray guidance, the specialist hit the joint every single time in 20 attempts.
Implications
If you are having an acromioclavicular joint injection, asking for it to be done with image guidance — ultrasound or x-ray — substantially raises the chance that the medication actually reaches the joint. Experience alone, without imaging, is not enough.
Source: Pichler W, Weinberg AM, Grechenig S, Tesch NP, Heidari N, Grechenig W. Intra-articular injection of the acromioclavicular joint. Journal of Bone and Joint Surgery - Series B 2009;91(12):1638-40. doi:10.1302/0301-620X.91B12.22740
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