Infrapatellar bursitis occurs when one or both of the bursa sacs inside the knee become irritated and inflamed resulting in swelling and knee pain. A bursa is a sac of synovial fluid, rich in protein and collagen.
In biology, motility is the ability of organisms and fluid to move or get around. A microbiologist might test and compare the motility of various single-celled organisms. An easy way to remember that motility means the ability to move without help is the mot- at the root of the word. It's the same root that's found in motor, which is, of course, the engine that drives a car. If you've got good motility then your motor is working.
Motility disorders such as gastroparesis are disorders of physiology, or gut function, not a structural problem of the gut. The problem won't be found unless it is properly searched for, with the appropriate diagnostic tools. Looking back through medical research related to gastroparesis,