When the knee moves in a different direction to the leg, dislocation of the kneecap can occur. Kneecap dislocation is not common and is usually associated with sports injuries.
Signs of a dislocation of the knee will be a deformity of the knee, the casualty will also be in a lot of pain and they will struggle to walk. A crack may have also been heard, when the knee came out of the joint.
A first dislocation should be treated quickly and treated by medical staff. This type of injury can take up to six weeks to heal. Keep the leg, outstretched and as still as possible, call 999. Don’t pick the casualty up yourself as this may cause more damage.