Wikis > Biomechanics > Clinical Biomechanics > Biomechanical Assessment > Lower Limb Alignment > First Ray positions
First Ray positions:
The plantar surface of the first metatarsal heads should normally be on the same plane as the lessor metatarsals.
Technique:
The neutral position is considered midway in its range of motion.
Clinical use:
• if first ray elevated dorsiflexed first ray (metatarsus primus elevatus) or forefoot supinatus
• if first ray is plantarflexed plantarflexed first ray (congenital or acquired), forefoot valgus or dorsiflexed lateral rays
Sources of error:
• STJ not in neutral and MTJ not pronated
• unequal amounts of pressure to dorsiflex and plantarflex the first ray
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