Residual Limb Model for Osteointegration - Computational Biomechanics of the Musculoskeletal System - page 167

14.3 model FIndIngS

14.3.1 l oadinG a
When only vertical forces were applied, the stresses on the bone adjacent to the implant were dis-
tributed quite evenly (Figure 14.2). The stresses over the entire implanted region of the bone were
in the ranges of 0.20 to 6.31 kPa/kg, 0.40 to 12.5 kPa/kg, and 0.86 to 27.7 kPa/kg, when a 200 N,
400 N, and 900 N axial force, respectively, was applied.

14.3.2 l oadinG B
The stress distribution on the implanted region of the bone was less uniform compared to loading
A, when the “true” forces and moments on the three axes, measured simultaneously during the
same exercises, were applied (Figure 14.3). The peak stresses in loading B in the implanted region

S, Mises (Mpa)
2.57
2.36
2.15
1.95
1.74
1.53
1.32
1.12
0.91
0.70
0.49
0.29
0.08

Peak stress:
2.57 MPa

Distal end

Section view Distal view

FIgure 14.2 (See color insert.) Stress distribution at the bone adjacent to the implant at loading condition A.

S, Mises (Mpa)
9.34
8.58
7.81
7.04
6.28
5.51
4.74
3.98
3.21
2.44
1.68
0.91
0.14

Peak stress:
9.34MPa

L

AP

ML

ML

AP

Section view Distal view

FIgure 14.3 (See color insert.) Stress distribution at the bone adjacent to the implant at loading condition B.