Biomedical Engineering Reference
In-Depth Information
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PERCENTAGE OF CYCLE
Fig. 6.20
Tibiofemoral Joint Forces and Motion for Normal Gait
Peak forces occur at about 20° of flexion but substantial forces are present
from 0° to 40° as shown in Fig. 6.20. As may be seen from Fig. 6.21 the
loading is not equally shared by the condyles. Rather, the bulk of the loading
in the high loading phase occurs in the more congruent medial condyle which
carries twice the maximum load of the lateral condyle. This high loading phase
is accompanied by significant lateral collateral ligament loading and abduction.
The less congruent lateral condyle is more highly loaded during the lightly
loaded swing phase.
Thus the knee experiences an oscillating varus-valgus loading which makes
tibial fixation difficult.
