Video on intra-articular injection technique for the knee joint

Intra-articular knee injection refers to the administration of medication directly into the knee joint, aimed at treating conditions such as degenerative knee arthritis and periarthritis of the shoulder. The procedure must be performed by a trained professional, and the specific steps are as follows:

1. The patient sits with the knee bent at 90 degrees and the lower leg hanging naturally. The physician, wearing sterile gloves, identifies the puncture site at the depressions on either side below the patella.

2. The physician disinfects the injection site and surrounding area (within a 5 cm radius) using iodophor.

3. Insert the needle with its bevel directed toward the center of the patella. A distinct sensation of "loss of resistance" is felt once the joint capsule is penetrated. Slight aspiration may reveal pale yellow synovial fluid.

4. Stabilize the needle with the right hand while slowly injecting the medication with the left hand. After injection, withdraw the needle slowly in the reverse direction of insertion.

5. Cover the injection site with a sterile gauze pad, then gently move the knee joint to promote drug dispersion and absorption.

While advancing the needle, aspirate continuously. If bright red blood appears, this indicates the needle has entered a blood vessel; in this case, slightly withdraw the needle and reposition it at a different angle before continuing.