Although there were significant improvements in all variables, except
WOMAC stiffness and range of motion, measured in all groups at the end of
the treatment and during the follow-up, this improvement was greater in active
IFC groups than in the sham group. The improvement in WOMAC stiffness was
observed only in active IFC treatment groups (P G 0.05). No significant difference
between different amplitude-modulated frequencies of IFC treatments was
observed