What is the purpose of a casting block in custom shoe fabrication?

The purpose of a casting block in custom shoe fabrication is primarily related to establishing the proper heel height. Casting blocks are used to create a mold of the foot in a specific position that reflects how the foot will function within the shoe. By determining the heel height accurately, the casting block helps in achieving both functional and comfort-oriented goals in the custom footwear.

Correct heel height is essential for maintaining proper biomechanics, ensuring that the foot is positioned optimally for gait and weight distribution. This can prevent discomfort and issues that may arise from incorrect shoe function, making it a fundamental aspect of custom shoe design.

The other options deal with specific alignments in different planes; sagittal, transverse, and frontal plane alignments all relate to the overall positioning of the foot and its stability during movement, but the casting block specifically addresses the heel height aspect to support the foot's proper function in the design of the shoe.