An interesting statement i saw today
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Interesting claim. The evidence that it was more accurate / reliable than, say, the FPI was not quoted.
I will admit to being ignorant as to what the SNA was. A little digging provided some background information
The supranavicular angle was first described in
Norkin, C.C. and Levangie, P.K. (1983) Joint Structure and Function. Philadelphia: Davis.
As the feiss line. It is comprised of the angle between the 1st met and the navicular and the navicular and the medial malleolus.
Cashmere, T., Smith, R.and Hunt, A. (1999) Medial longitudinal arch of the foot: stationery versus walking measures. Foot and Ankle International. 20(2), 112-118.
Went into rather more detail.
What is the view of the community on this as a diagnostic tool?
My immediate thoughts are
- As a static measurement it may not be indicative of dynamic function
- It would appear to have the same problems as RSCP in terms of variability of soft tissue markings
-It would be somewhat skewed by the planal dominance. A foot with a transverse planal dominance for example might display far more drift than drop and could have a lower SNA than the foot with the same degree of pronation and a frontal planal dominance.
Regards
Robert
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