What you do to the Aspirated blood?: help diagnosis further by Looking at it !!!

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Occasionally in the situation of a tense haemarthrosis, the knee can be aspirated under sterile conditions to remove the blood from within the joint, and some local anaesthetic can be injected into the knee to help with pain relief. The aspirated blood should be placed into a container and left to stand. If the injury involves a fracture of the underlying bone, in other words if the damaged fragment that has been knocked off includes cartilage and bone, then usually droplets of fat from the bone marrow are released into the knee and these are visible in the aspirated fluid and will float to the top pf the aspirated blood if left to stand.

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