Foot Posture Index
This was originally develeoped by Tony Redmond as a means to overcome some of the limitations of previous methods of quantifying posture of the foot.
We have two recent publications in which we used it in:
Static Stance Response to Different Types of Foot Orthoses
The Reliability of the Manual Supination Resistance Test
Another 2 papers from the University of South Australia has just appeared look more at the FPI validity:
Criterion Validation of Four Criteria of the Foot Posture Index
Reliability of the Foot Posture Index and Traditional Measures of Foot Position
My opinion on the Foot Posture Index (FPI):
We use it a lot in research. We use it a lot as part of the inclusion criteria for our orthotic studies (eg we may only recruit those with a Foot Posture Index greater than, say, 6 --> this probably indicates that these people would have probably got foot orthotics if they had symptoms related to a pronated foot --> anything >4-5 on the Foot Posture Index is a pronated foot). The the end of the day, the Foot Posture Index is good for what it is designed for. Like a lot of tools its not good for what it is not designed for.
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