Which material is typically avoided in orthosis design due to its weight?

Stainless steel is often avoided in orthosis design primarily because of its substantial weight. While stainless steel possesses strength and durability—qualities that may be beneficial in certain contexts—its heaviness can lead to discomfort and restricted mobility for the user. In the design of orthotic devices, it's crucial to strike a balance between strength and weight to enhance the patient's comfort and adherence to wearing the device regularly.

The other materials listed are typically chosen for their favorable properties. Plastic is known for being lightweight and moldable, making it a common choice for various orthotic applications. Aluminum, while somewhat heavier than plastic, generally still offers a lighter alternative than stainless steel, along with decent strength. Lightweight alloys provide the benefit of being strong yet lighter than traditional metals, making them suitable for orthosis design where minimizing the overall weight is essential.

Thus, the selection of materials in orthotic design prioritizes user comfort and effectiveness, with stainless steel being less favorable due to its weight implications.