Table 4. Dynamic histomorphometry of cortical bone in growing rats. Values are means (±SEM).
|
1-Week |
2-Week |
4-Week |
8-Week |
L1 |
C1 |
L2 |
C2 |
L4 |
C4 |
L8 |
C8 |
Femur |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
Periostium |
MS/BS |
36.6 (3.6) |
32.6 (2.6) |
41.2 (4.7) |
39.9 (4.5) |
43.2 (4.9) |
34.0 (4.8) |
33.0 (4.7) |
36.2 (2.8) |
MAR |
1.8 (.79) |
3.0 (.73) |
2.9 (.94) |
2.3 (.6) |
1.7 (.40) |
2.3 (.44) |
1.5 (.43) |
1.8 (.47) |
BFR/BS |
.83 (.38) |
1.07 (.25) |
1.42 (.46) |
1.07 (.34) |
.87 (.22) |
.90 (.19) |
.57 (.18) |
.75 (.21) |
Endosteum |
MS/BS |
37.3 (3.9) |
41.5 (5.4) |
39.3 (3.0) |
35.2 (3.5) |
38.4 (5.9) |
36.9 (4.8) |
27.5 (6.6) |
21.7 (4.2) |
MAR |
1.3 (.57) |
3.4 (.93) |
1.3 .64) |
1.6 (.54) |
1.4 (.32) |
1.6 (.32) |
1.7 (.33) |
1.9 (.68) |
BFR/BS |
.64 (.31) |
1.70 (.45) |
.62 (.35) |
.74 (.28) |
.70 (.17) |
.72 (.16) |
.55 (.15) |
.50 (.15) |
Tibia |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
n=12 |
Periostium |
MS/BS |
40.3 (2.0) |
30.2 (3.3)* |
40.1 (3.8) |
37.9 (3.6) |
35.4 (2.6) |
28.3 (3.2) |
21.5 (3.9) |
29.0 (2.7) |
MAR |
1.0 (.41) |
.6 (.32) |
1.2 (.53) |
1.0 (.38) |
.8 (.34) |
.5 (.29) |
.7 (.40) |
.7 (.35) |
BFR/BS |
.42 (.18) |
.23 (.13) |
.61 (.27) |
.48 (.19) |
.35 (.16) |
.19 (.11) |
.27 (.15) |
.19 (.11) |
Endosteum |
MS/BS |
37.8 (5.4) |
28.1 (3.4) |
35.0 (3.8) |
39.2 (3.5) |
37.6 (4.2) |
38.4 (3.9) |
27.5 (4.7) |
32.5 (3.3) |
MAR |
1.7 (.62) |
1.1 (.45) |
1.5 (.70) |
1.3 (.39) |
1.7 .(43) |
1.7 (.52) |
1.0 (.45) |
1.2 (.36) |
BFR/BS |
.84 (.32) |
.43 (.20) |
.69 (.33) |
.57 (.19) |
.73 (.20) |
.72 (.22) |
.38 (.24) |
.45 (.14) |
*, significant difference was shown between landing group to the time-matched sedentary control group, p < 0.05. BFR/BS, bone formation rate per bone surface, μm
3/μm
2/day; MAR, mineral apposition rate, μm/day. MS/BS, bone mineralization over bone surface, %.