Identify a standard classification used in orthotic devices.

The classification of orthotic devices into rigid, semi-rigid, and soft orthotics is a widely accepted standard in the field. Rigid orthotics provide maximum support and stability, often used to immobilize a joint or assist in alignment. Semi-rigid orthotics offer a balance between support and flexibility, making them suitable for rehabilitation and dynamic movements while still providing some structural support. Soft orthotics, on the other hand, are typically made from softer materials and are used for cushioning, comfort, and reducing pressure on sensitive areas.

This classification effectively captures the primary functional characteristics of orthotic devices, helping practitioners select the appropriate type based on patient needs. The other classifications do not reflect the commonly recognized categories within orthotics, which can lead to confusion about the orthotic's intended use and application.