musculoskeletal and connective tissue disorders
How To Do Knee Arthrocentesis
Relevant Anatomy for Knee Arthrocentesis
When using the anteromedial approach, the needle enters 1 to 2 cm medial to the superior half or third of the patella. A similar approach can be used from the lateral side of the knee. The knee and connecting suprapatellar pouch can be punctured while the patient is supine and the knee is extended. The needle, 18- or 20-gauge, can be inserted anteromedially, under the cephalad half or third of the patella. Alternatively, the needle can be inserted laterally, just under the cephalad edge of the patella (shown in drawing). 