Final answer:
Lengthening is not a common sign of an extremity injury; common symptoms include pain, swelling, and deformity. Lengthening of a limb is not usually associated with injuries, which more often result in the cardinal signs of inflammation and potential complications like edema.
Step-by-step explanation:
The common signs and symptoms of an extremity injury include pain, swelling, and deformity. However, lengthening of the limb is not a common sign or symptom of an extremity injury. Typically, injuries can lead to a loss of function, redness, and increased warmth due to inflammation, but they don't cause the limb to become longer. In the context of inflammation, the cardinal signs also include redness and local heat, alongside swelling and pain. Extremity injuries may result in complications such as edema, which is characterized by an abnormal accumulation of fluid in the tissues, leading to swelling, but not lengthening of the limb.