The Design, Development, and Initial Evaluation of a Multisegment Foot Model for Routine Clinical Gait Analysis

As shown in Figure 25.1, this single-segment foot model is based on a vector that passes from the calcaneus to the space between the second and third metatarsals. The plantar surface of the foot provides a reference for the sagittal plane alignment of this vector. The ankle center (AC) and toe marker are

intended to provide references for transverse plane alignment, although sometimes the heel marker and toe marker are used instead.