How common is visible deformity after injury in patellar dislocation?

The patella normally glides in a groove at the front of the knee. During a dislocation it can shift to the side, making the knee look angular or the kneecap visibly off-centre. Swelling, pain, and guarding may limit movement. A clinician also needs to consider cartilage, ligament, or bone injury that cannot be judged from appearance alone.

Keep the knee in the position that causes the least discomfort. Do not force it straight or press the kneecap inward. Support the leg with padding and avoid standing on it.

Arrange urgent medical assessment after a knee injury with visible displacement, whether or not the kneecap seems to move back on its own. Use a wrapped cold pack beside the knee for comfort, protect the skin, and use safe transport. Do not massage the knee or test it by walking.

The assessment may include circulation, sensation, and movement checks followed by imaging. If reduction is needed, trained staff can guide the kneecap back while checking for associated injury. A brace and rehabilitation plan may follow, based on the examination.

Get emergency help if the foot becomes cold, pale, blue, numb, or difficult to move, if pain is severe or rapidly increasing, or if there is an open wound. These changes may reflect a more serious injury involving circulation, nerves, or surrounding tissues.

Even if the kneecap returns to place, prompt assessment remains appropriate because swelling and internal injury may persist. Keep the leg supported until reviewed.

Ask whether the kneecap is aligned, whether an X-ray or other imaging is needed, and whether bone or cartilage was injured. Ask about a brace, safe exercises, weight-bearing, recurrence warning signs, and the point at which physiotherapy should begin.