Does patellar dislocation cause visible deformity after injury?

A patellar dislocation happens when the kneecap shifts out of its groove at the front of the thighbone. This can create a visible change in the knee shape, a feeling that the joint is out of place, swelling, and marked pain. The kneecap can sometimes move back into position before examination, so a normal-looking knee does not rule out an injury.

A visible change after a fall, twist, or blow needs assessment because nearby ligaments, cartilage, or bone may also be injured. The appearance alone cannot identify the full extent of damage.

Keep the leg still in the position that feels safest and avoid trying to push the kneecap back into place. Do not walk on the leg if doing so increases pain or the knee feels unstable. Support the limb, use a wrapped cold pack for short periods, and arrange prompt medical evaluation. A clinician may examine alignment and movement and decide whether imaging is needed.

Seek emergency help if the knee is visibly out of place, the foot becomes cold or pale, numbness develops, pain is severe, or you cannot move the leg. Urgent assessment is also appropriate after a high-impact injury or when swelling increases quickly. These features can signal a more serious injury requiring prompt treatment.

Ask whether the kneecap is still displaced, whether the joint needs imaging, and which brace or activity limits are appropriate. You can also ask when gentle movement should begin and how rehabilitation will reduce the chance of another dislocation.