Microvilli (singular: microvillus) are microscopic cellular membrane protrusions that increase the surface area of cells and minimize any increase in volume, and are involved in a wide variety of functions, including absorption, secretion, cellular adhesion, and mechanotransduction. 1 Locations.
When youâre experiencing back knee pain, the cause of the problem may be due to a condition known as a Bakerâs cyst. When the back knee pain is associated with a Bakerâs cyst, it isnât a cyst in the usual sense. Itâs a popliteal cyst. What this means is that fluid is present in the joint at the back of the knee.
Quick Answer. Conditions that cause knee pain and swelling include a broken knee, arthritis of the knee, bursitis of the knee, Osgood-Schlatter disease and osteomyelitis, according to the American Academy of Orthopaedic Surgeons. Pain can range from mild to excruciating, depending on the condition. Continue Reading.