Concise report
Placement of intra-articular injections verified by mini
air-arthrography
Henning Bliddal
Department of
Rheumatology, Copenhagen Municipal and Frederiksberg Hospital,
Copenhagen Denmark
Correspondence to: Professor H Bliddal, Department of Rheumatology, Frederiksberg Hospital, Copenhagen 2000 F, Denmark.
Accepted for publication 16 June 1999
OBJECTIVE
To develop
and assess a simple, inexpensive method for ascertaining the placement
of intra-articular injections for knee osteoarthritis
METHODSDuring a one
year period patients with "dry" osteoarthritis of the knee who
received intra-articular therapy were tested by air-arthrography. Along
with triamcinolone and lignocaine (lidocaine), 5 ml of air was injected
into the joint. On subsequent lateral and anterior-posterior
radiographs a correct placement was verified by a sharply defined
shadow of air in the suprapatellar pouch, while extra-articular air was
diffusely spread in the surrounding tissue.
RESULTSIn 51 of 56 cases the injection was correctly placed. In the remaining five cases
the injection was immediately repeated and positioned within the joint.
No adverse events were seen that could be ascribed to the use of air
during the study, although bleeding in the quadriceps was seen one week
after an extra-articular injection.
CONCLUSIONWith
mini-air arthrography, it is possible to test the placement of
intra-articular injections in knee joints. The method is proposed as a
learning tool as well as providing a means of quality assurance in
studies involving intra-articular injections.
© 1999 by Annals of the Rheumatic Diseases
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