The foot is made up of three concave arches (hollow towards the bottom): the medial arch, the top of which is the scaphoid or navicular bone, the lateral arch, the top of which is the base of the 5th metatarsal, and the anterior arch, the top of which is the head of the 3rd metatarsal. Metatarsalgia concerns the anterior arch, which collapses over time or more rapidly when wearing high-heeled shoes. This anterior arch becomes flat or even convex (hollow towards the top), also known as a round forefoot. This causes hyper-pressure on the medial metatarsal heads (2nd, 3rd, 4th), leading to overheating and pain under the forefoot pads. This collapse of the anterior arch of the foot can also lead to other pathologies.

The spaces between the metatarsals contain bursae and nerves. When the downward-sloping metatarsals compress the bursae, they cause intercapitular bursitis, and when they compress the nerves, particularly the sciatic nerve terminal, they cause Morton's syndrome or disease.

Thanks to the retro-capital bar, New Equilibre Metatarsalgia insoles will reorganize the support of this forefoot by restoring its physiological shape, thus avoiding overload and compression, relieving both existing pain and preventing the onset of the various pathologies of the forefoot.
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