You may not be able to bend or straighten your knee after an injury,
especially if your knee is swollen. When the swelling goes down, normal
movement will usually return.
Pain may make your knee and the muscles around it feel weak, but you
should still be able to move them.
Your muscles may sometimes feel weak or stiff, especially after a
strenuous workout. This usually means you have overexerted yourself.
Other causes of weakness, stiffness, or decreased movement
include:
- Damaged muscles, tendons, bones, or
nerves.
- A
dislocated kneecap.
- Another medical
condition, such as arthritis.
Your knee may lock if you have a more serious problem-such as a
free-floating piece of bone, cartilage, or a foreign object in a joint (loose
body)-or a tear in the shock-absorbing disc that cushions the knee (torn
meniscus).
Treatment depends on the cause of your symptoms, your age, and other
health conditions.
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