I'm not really familiar with this myself but this is what I found:
Pes anserinus is the anatomic term used to identify the insertion of the conjoined tendons into the anteromedial proximal tibia. From anterior to posterior, the pes anserinus is made up of the tendons of the sartorius, gracilis, and semitendinosus muscles. The tendon's name, which literally means "goose's foot," was inspired by the pes anserinus's webbed, footlike structure. The conjoined tendon lies superficial to the tibial insertion of the medial collateral ligament (MCL) of the knee.
Intrabursal injection with local anesthetics and/or corticosteroids is a second line of treatment. A study found no difference in short-term pain relief afforded by 3-5 mL of 1% lidocaine with or without methylprednisolone. Injection can be directed to the point of maximal tenderness. Take care to avoid injection within the tendons themselves. Occasionally, an area 0.5-1 cm higher than the tendons is injected in order to include the MCL bursa, which also may be a pain generator. Relief is usually immediate but may not be complete.
Repeated lidocaine injections or the use of corticosteroids may result in longer-lasting relief (from 1 to several months). Generally, use a 22-gauge or 23-gauge needle to inject 1-3 mL of 1% lidocaine and corticosteroid (20-40 mg of triamcinolone, 20-40 mg of methylprednisolone, or 6 mg of betamethasone). If infectionâ€”which is rarer here than in the bursae of the anterior kneeâ€”is suggested, use a larger, 19- or 20-gauge needle and a 20-30 mL syringe for aspiration. Patients who do not respond to initial injection rarely respond to repeated bursal injections. Injection of the knee joint itself may be beneficial in recalcitrant cases.
20551-injection; single tendon origin/insertion
20610-arthrocentesis, aspiration and/or injection; major joint or bursa.
It looks like this could go either way. I think I would use the 20551 for the injection unless it states as in the last sentence that the knee joint itself is injected. But, I would confirm this with dictation and/or ask the Dr.
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