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Arthrocentesis of the metatarsophalangeal joint.

Arthrocentesis of the metatarsophalangeal joint.
Arthrocentesis of the metatarsophalangeal joint.

Synovial fluid is withdrawn from any of the metatarsophalangeal joints. The foot and toes are flat while the patient is supine and the knee is flexed. Needle entry occurs along the dorsal portion of the joint, just medial or lateral to the extensor hallucis/digitorum longus tendon.