highly significantP < 0.0001
There was no statistical significant difference in the evolution of the HHS between the three groups (Table 2 ). Viscosupplementation provided a highly significant pain reduction in the Adant-group ( P < 0.0001), a significant pain reduction in the Synocrom-group ( P < 0.05) and a pain reduction that did not reach significance in the Synvisc-group ( P > 0.05).