Orthotics

Orthotics is a specialized medical field focused on the design and application of orthoses.

An orthosis is an externally applied device used to influence the neuromuscular and skeletal systems. These devices are commonly known as braces, calipers, or splints. They work by altering the structural or functional characteristics of the body. Orthotics is essential because it helps people regain stability and movement. By supporting specific body parts, these tools can compensate for lost muscle function or skeletal issues.

An orthotist is the medical professional responsible for these devices. They must master several complex fields, including anatomy and physiology. They also use biomechanics, which is the study of how the body moves. To create modern devices, orthotists use engineering and artistic modeling skills. They may use CAD/CAM systems, CNC machines, or 3D printing. In the United States, a patient needs a prescription from a licensed healthcare provider. In the U.K., orthotists often accept referrals from doctors for assessments without a formal prescription.

Orthoses are categorized by the anatomical region they support. The International Classification System (ICS) divides them into four main areas. These include the head, the trunk, the upper extremities, and the lower extremities.

Professionals also use acronyms to describe which joints are supported. For example, a KAFO is a knee-ankle-foot orthosis. A TLSO is a thoracic-lumbar-sacral orthosis that supports the spine. Using these standardized names helps researchers avoid confusion in scientific studies. This precision ensures that medical teams communicate clearly about patient care.

There are three main types of products available in orthotics. Custom-fabricated products are made individually for one specific patient. These are often the best choice because they match a unique body shape. They also allow for optimal matching of functional needs. Semi-finished or prefabricated products are made industrially for fast supply. These are used for common diseases and can sometimes be adapted to a patient. Finished products, also called off-the-shelf products, are industrial devices for short-term use.

Creating a custom orthosis is a detailed scientific process. Traditionally, makers followed the trace of a limb using physical measurements. Today, many use a plaster of Paris mold to capture the body's shape. Modern materials have changed how these devices feel and work. Using carbon fiber composites and aramid fibers embedded in epoxy resin reduces weight. This makes the device much lighter for the user. These materials allow for perfect stiffness in some areas and flexibility in others. For instance, a brace can be stiff at the ankle but flexible at the forefoot.

Paralysis orthoses are specifically designed for patients with muscle failure. This includes partial paralysis, known as paresis, or complete functional failure. These devices aim to correct limitations or replace lost functions. To ensure a good fit, the orthotic shell must be in total contact with the limb. Lightweight materials like titanium and aluminum are indispensable here. Using these metals helps reduce the energy a person needs to walk. Custom designs also allow for integrated orthotic joints. These joints can be matched exactly to the patient's anatomical pivot points.

When treating paralysis, orthotists must test muscle strength levels. They examine six major muscle groups to determine the necessary support. Doctors use a scale from 0 to 5 to measure strength. A value of 0 means complete paralysis, while 5 is normal strength. Any value below 5 is considered muscle weakness. The specific combination of these levels determines if a patient needs an AFO or a KAFO.

For patients with central nervous system issues, like a stroke, the process is different. In those cases, doctors must also analyze gait patterns using tools like the Amsterdam Gait Classification. This ensures the brace helps correct the specific way a person walks.