The Tracer CAD system is a portable computer–aided design system that uses a digital pen to trace and generate a 3–dimensional model of a patient´s limb or torso in just minutes, and displays the model on a computer screen where our practitioner can make modifications instantly using the computer keyboard. We can transport our light-weight TracerCAD laptop to hospitals, clinics, patients´ homes or anywhere our patients are located. It eliminates the need for messy plaster casting and the waiting time for casts to dry, and the computer takes extremely accurate measurements.