By the injection of air, it is possible to test the placement of intraarticular injections in both hip and knee joints. This procedure will give a supplementary documentation of the injection as compared to a mere ultrasonographic demonstration of the position of the needle in the joint. The method is proposed as a tool for both learning purposes and quality assurance in daily therapy.

The finding in the majority of cases of both effusions on B-mode US and Doppler activity confirms that there is a varying degree of inflammation in knee OA as diagnosed by the ACR criteria.

No abstract