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12.3 RESULTS 245

FIG. 12.4 Minimum principal stress in an intact foot with loads of 300 (A), 600 (C), and 750 N (E), respectively, and with 7.5mm bone excision and
loads of 300 (B), 600 (D), and 750N (F), respectively.

Minimum principal stress (compression) was concentrated in a different way at the calcaneus zone (Table 12.2;
Fig. 12.4). When the load on the talus and the volume of bone extraction increased, compression stress in the healthy
model and the simulated model with removal of bone material were very different. In the intact model the compression
stress was localized from the dorsoposterior aspect of the calcaneus and the support zone (Fig. 12.4). In the extracted
bone model, the compression stress was localized in the “central area” of the calcaneus called the “neutral area”
(Fig. 12.4).

I. BIOMECHANICS