Longitudinal line through talus
It is aligned with a longitudinal line through the first metatarsal
When talar axis below 1st MT axis, pes planus
When talar axis is above 1st MT axis, pes cavus
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Longitudinal line through talus
It is aligned with a longitudinal line through the first metatarsal
When talar axis below 1st MT axis, pes planus
When talar axis is above 1st MT axis, pes cavus