Osteoarthritis (OA) is the most common form of joint pain, affecting the knees, hips, back and feet of over 20 million Americans. A joint’s cartilage (the tough, smooth material at the end of bones) wears away over time. When this happens, the edges of the bones rub together, causing the joint to feel stiff and sore.
When cartilage wears away at the knee, the joint becomes “compacted” as the ends of the thigh bone and shin bone rub together. Usually, the compaction occurs on either the inside (medial) part of the leg or outside (lateral); sometimes both sides are compacted.