Table 2 Maximum displacement at the osteotomy site of each model and maximum stress on the implanted bone plate and screws under different loading directions
Loading Direction on the 1st metatarsal bone | implant | Maximum displacement of head (mm) | Maximum von Mises of Plate (MPa) | Maximum von Mises of screws (MPa) | Maximum Fractional Stress between bone/screw interface (MPa) / [screw no.] | |
|---|---|---|---|---|---|---|
At distal | At proximal | |||||
from dorsal to plantar (flexion/extension moment) | A-Plus | 0.746 | 447.94 | 694.82 | 70.61 [1] | 36.841 [2] |
VTEK (0 mm offset) | 0.289 | 359.71 | 725.49 | 15.48 [1] | 27.24 [5] | |
VTEK (7 mm offset) | 0.358 | 623.21 | 456.67 | 54.91 [1] | 18.41 [6] | |
New Design | 0.278 | 429.51 | 294.97 | 28.21 [3] | 28.33 [4] | |
from medial to lateral (abduction/adduction moment) | A-Plus | 0.553 | 603.43 | 709.66 | 61.95 [1] | 35.76 [2] |
VTEK (0 mm offset) | 0.345 | 567.76 | 520.60 | 15.15 [1] | 67.79 [5] | |
VTEK (7 mm offset) | 0.293 | 328.72 | 349.41 | 14.17 [1] | 35.67 [5] | |
New Design | 0.152 | 254.27 | 195.40 | 24.61 [3] | 31.90 [5] | |