Explain the difference between an internal/external fixation device

Internal and external fixation devices are orthopedic
devices used to stabilize a fractured bone (usually a long bone). When a bone is
fractured it must be immobilized to heal correctly. Immobilization is commonly achieved
by casting the extremity (applying a cast).

More
complicated fractures may require surgical procedures to achieve the needed
immobilization. Internal fixation devices are used internally (under the skin) to repair
and approximate the bone. These devices are usually left in place after the bone has
healed.

External fixation devices are used for the same
reasons but they protrude through the epidermis and are visible. Commonly, EFD's need
periodic adjustments by the orthopedic physician. After the bone has healed, the EFD is
surgically removed.