When a molecule has no dipole moment, like CO2, then it is nonpolar. When a molecule has a dipole moment like water, then it is polar. This polarity business is very important. Polar molecules are like little magnets, with a positive end and a negative end, and they interact with each other through magnetic attractions.
Degenerative Joint Disease - Hip (Osteoarthritis) Osteoarthritis or Degenerative Joint Disease is the most common type of arthritis that occurs most commonly in hips, knees, ankles, and foot joints. Osteoarthritis is also known as wear and tear arthritis since the cartilage simply wears out. When cartilage wears away, bone rubs on bone causing severe pain and disability.
A prosthesisâwhich may also be called an implantâtakes the place of the damaged area of the knee, leaving the other compartments intact. (Partial knee replacement surgery may also be referred to as partial knee resurfacing, unicondylar knee surgery, unicondylar knee replacement, or unicondylar knee arthroplasty.)