Which combination of materials provides the best strength-to-weight ratio for orthosis?

The combination of plastic and metal offers an excellent strength-to-weight ratio for orthosis applications due to the unique properties of both materials. Plastics are known for being lightweight and flexible, allowing for comfort and ease of movement when used in orthotic devices. They can be molded into various shapes to fit the contours of the body effectively.

On the other hand, metals, especially those like aluminum, are renowned for their high tensile strength and durability. When combined with plastic, metal enhances the overall structural integrity of an orthosis without significantly increasing its weight. This combination allows for devices that are strong enough to provide the necessary support while still being lightweight, which is crucial for patient comfort and mobility.

In contrast, the other options do not provide the same balance of strength and lightness. For instance, while wood may offer strength, it tends to be heavier and less suitable for the intricacies required in modern orthotic design. Ceramics generally do not exhibit the same level of flexibility or weight-to-strength efficacy as plastics and metals, making them less practical for this application. Lastly, glass, while strong, is brittle and lacks the resilience needed in mobile applications, which diminishes its effectiveness in orthosis when paired with aluminum.