As a rule, an orthosis is a therapeutic appliance manufactured by an orthopedic technician for stabilization, relief, immobilization or positional correction of limbs or the trunk. They are used after fractures, operations, paralyses, inflammations, rheumatism as well as in cases of insufficient flexion or extension. On the one hand, they can partially replace lost functions, while on the other hand, their use prevents sequelae—for example due to poor posture or malposition—and the wear of affected body parts.

Orthoses can be classified by their area of application (leg, arm, trunk, etc.) and by their function (fixation, stabilization, etc.).

They can be used for a variety of different disorders and vary in form and function. An orthosis must be manufactured or at least adjusted by an orthopedic technician to ensure that it fits correctly and functions efficiently. Depending on the type of orthosis, this may be a relatively simple or a very time-consuming process.

The images below show types of orthoses that are frequently used for the treatment of fibular and tibial hemimelia: