An unstable knee may not support your weight or may "buckle" when
you try to walk on it. Trying to move the joint may cause severe pain. A child
will protect his or her leg or may be unable to walk or stand.
Knee instability or buckling can have many causes, such as:
As the name suggests, runner's knee is a common ailment among runners. But it can also strike any athlete who does activities that require a lot of knee bending -- like walking, biking, and jumping. It usually causes aching pain around the kneecap.
Runner's knee isn't really a condition itself. It's a loose term for several specific disorders with different causes. Runner's knee can result from:
Overuse. Repeated bending of the knee can irritate the nerves of the kneecap. Overstretched...