The same pair of proprioceptive insoles are inside both pair of shoes (old and new):

Note the change in position/twist of the left foot

  • Foot Twist increased in old shoes
  • Foot Twist diminished in new shoes

Unstable/Unevenly Worn Shoes - Gait Analysis

Impact on Proprioceptive Signal

Inventor and Designer of Postural Control Insoles

2.  Old / Worn Shoes diminish the effectiveness of the insoles

1.  Old / Worn Shoes distort the proprioceptive signal to the cerebellum (brain), which can increased foot twist 

Shoes are one year old . The midsoles are medially compressed

Note the increase in the left foot twist (pronation) when proprioceptive insoles are worn inside the old shoes.