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Review Question - QID 955

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QID 955 (Type "955" in App Search)
When performing an aspiration or intra-articular injection in the knee, the most accurate needle placement site is which of the following?

At the site of maximal tenderness

1%

23/2485

Medial to patellar tendon with knee flexed

6%

152/2485

Lateral to patellar tendon with knee flexed

17%

429/2485

Medial to proximal patella with knee in extension

4%

98/2485

Lateral to the patella with knee in extension

71%

1770/2485

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Intra-articular administration of medications has been shown to be highest with the injection performed lateral to the middle to proximal patella with the knee in extension. Extension allows greater patellar mobility and increases the available space in the patellofemoral joint compared to flexion. A lateral starting point when injecting into the patellofemoral joint has less overlying soft tissue than medial, which makes it easier to palpate the bony landmarks and evert the patella.

Jackson et al. evaluated 240 consecutive injections in patients without clinical knee effusion placed anteromedial, anterolateral, or lateral midpatellar. Using fluoroscopy to confirm location, accuracy rates were highest for the midlateral portal (93%) compared to anteromedial (75%) or anterolateral (71%).

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