Biomedical Engineering Reference
In-Depth Information
Ten fresh cadaveric specimens of the pelvis and lower limb were analyzed in this study. Some of the
recorded parameters are listed in Table 11.3. CT scans and cross-section dissections were performed
on these specimens to observe the distribution of cancellous bone in the distal femur and the proximal
tibia. Both the tibial plateau (TP) and FC were mainly occupied with cancellous bone, and the average
thickness of the cancellous bone in these two regions was 6.24 and 5.64 cm, respectively. This sug-
gested that the FC and TP are potential materials for reconstructing an incomplete hemipelvis, but no
single one of them is capable of reconstructing the pelvic ring and TI in situ (Mei et al. 2008).
Two samples, using combinations of the femur and tibia, were used to reconstruct the hemipelvis.
In one sample, TI was reconstructed with the FC and the proximal tibia was used as a bridging bone
to connect the FC and contralateral pubic as a natural pubic arch. In the other sample, the TP was
used to reconstruct TI and the distal femur was used as a bridging bone. FC-reconstructed (FCR)
and TP-reconstructed (TPR) samples and their x-ray photographs are shown in Figures 11.2 and
11.3. The images indicate that the combined use of the distal femur and proximal tibia could regain
the pelvic ring structure.
table 11.3
anatomic measurements of the Pelvis, Femur, and tibia
Parameters
measurement
The perpendicular distance from TI to the median sagittal plane
4.52 ± 0.48
The perpendicular distance from TI to the coronal plane through the AS center
3.31 ± 0.57
The distance from TI to the ipsilateral AS
11.75 ± 6.19
The distance from TI to the symphysis pubis
15.72 ± 5.19
The maximum oblique diameter of the FC
7.93 ± 0.44
The maximum oblique diameter of the TP
7.19 ± 0.61
Note:
TI: tuberosity of ischium; AS: auricular surface; FC: femoral condyle; TP: tibial plateau. Measurements in cm; mean
± one standard deviation.
(a)
(b)
FIgure 11.2
Photograph (a) and x-ray (b) of pelvic reconstruction using the femoral condyle to replace the
tuberosity of the ischium.
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