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Subchondral bone marrow edema is also commonly seen in patients with degenerative joint disease (10 â 14). Subchondral bone marrow edema in patients with osteoarthritis of the knee joint has been associated with knee pain and the progression of articular cartilage degeneration (12, 13).
Reactive Hyperemia. Reactive hyperemia is the transient increase in organ blood flow that occurs following a brief period of ischemia (e.g., arterial occlusion).hen the occlusion is released, blood flow rapidly increases (i.e., hyperemia occurs) that lasts for several minutes. The hyperemia occurs because during the period of occlusion, tissue hypoxia and a build up of vasodilator metabolites (e.g., adenosine) dilate arterioles and decrease vascular resistance.