1. Supracondylar fractures of the humerus are most common in children and can cause cubitus valgus. They do not cause compartment syndrome but can lead to vascular insufficiency if the brachial artery is compressed.
2. Colles' fractures present with a "dinner fork" deformity and ulnar displacement of the distal fragment. They are treated surgically in elderly patients to prevent stiffness.
3. Fractures of the femoral neck are common in elderly men and treated surgically. They can be seen on x-ray by distortion of Shenton's line.