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 joint at the base of the big toe (the first metatarsophalangeal joint) actually ends up inside the joint — and how that hit-rate varies with the experience of the person doing it and with the presence of arthritis or bunion deformity.
Rationale
This joint is a very common site for diagnostic taps and steroid injections. If the needle does not reach the inside of the joint, the medication does not work where it is needed, and the patient may be left wondering why their treatment failed. We wanted hard numbers, not impressions.
Results
Across 106 cadaveric joints, the overall accuracy was high — about 90% of injections reached inside the joint. A medical student got it right 87% of the time, a trainee 92%, and an experienced surgeon 93%. But where the joint was deformed by arthritis or bunion, the failure rate climbed significantly.
Implications
For a normal big-toe joint, an injection given by a competent clinician is likely to land where it should. If the joint is already badly deformed, the chances of a missed injection rise — and using ultrasound or x-ray guidance becomes a sensible safeguard, particularly when an injection has previously failed to give the expected relief.
Source: Heidari N, Kraus T, Fischerauer S, Tesch N, Weinberg A. Do the presence of pathologic changes and the level of operator experience alter the rate of intra-articular injection of the first metatarsophalangeal joint? A cadaver study. Journal of the American Podiatric Medical Association 2013;103(3):204-7. doi:10.7547/1030204
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