Biomedical Engineering Reference
In-Depth Information
0
1 day
2 days
5 days
10 days
20 days
30 days
50 days
75 days
100 days
0.00004
0.00003
0.00002
e
0.00001
0.00000
0.026
0.028
0.030
0.032
0.034
0.036
r ( m )
FIGURE 3.11
Variation of e with time t along the radii for thermal load.
seen from the figure that a magnetic load has a similar influence
on bone structure to an electric load. A magnetic load can also
inhomogenize an initially homogeneous bone structure through
the bone remodeling process. Further experimental and theo-
retical investigations need to be developed to obtain the exact
remodeling rate coefficients and to discover the importance of
the role played by magnetic stimuli.
• Case 3: p ( t ) = 0, P = 1500 N, T 0 ( t ) = 0.1°C, φ b − φ a = 0, ψ b − ψ a = 0.
• Figure 3.11 shows the variation of e with time t along the radii of
bone when the thermal loading case is applied. A similar phe-
nomenon to that of Figure 3.10 is evident in Figure 3.11, indicat-
ing that a warmer environment may improve the remodeling
process with a less porous bone structure, and change of tem-
perature can also result in an inhomogeneous bone structure.
As mentioned in Qin and Ye [19], the process by which tempera-
ture change can affect bone remodeling is still an open ques-
tion. An initial purpose of the study presented in Qu and Qin
[11] was to show how a bone may respond to thermal, magnetic,
and electric loads and to provide information for the possible
use of imposed external temperature and/or magnetic-electrical
fields in medical treatment and in controlling the healing pro-
cess of injured bones. Further investigations are undoubtedly
needed.
 
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