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Fig. 4. (A) Knee and (B) ankle joint angles computed from unloaded joint rotation
using anatomical specimens. The traces represent a typical pattern of
flexion/extension, adduction/abduction (add./abd.; varus/valgus at knee) and
internal/external rotation (int. rot./ext. rot.). Both the knee and ankle
exhibit coupled internal/external and abduction/adduction (varus/valgus at
knee) rotation with passive flexion/extension.