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Phalanges of the foot: want to learn more about it?

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Phalanges of the foot

The phalanges are long bones in the foot located distal to the metatarsals. Like in the hand, each toe consists of three phalanges, which are named the proximal, middle and distal phalanges. However, the hallux (great toe) only has two phalanges, a proximal and a distal one. Occasionally, there are only two phalanges in the little toe.

The phalanges consist of a proximal base, a shaft and a distal head. This article will cover the anatomy of the phalanges of the foot, including muscle attachments, supply and ossification, followed by any relevant clinical pathology.

Anatomy

Joints

The phalanges in the foot are much shorter than those in the hand, and their total length is also much shorter than the metatarsals. The bases of the proximal phalanges articulate with the heads of the associated metatarsal bones to form the metatarsophalangeal joints.

The heads of the proximal phalanges articulate with the bases of the middle phalanges to form the proximal interphalangeal joints. The distal interphalangeal joints are formed by the articulations between the heads of the middle phalanges and the bases of the distal phalanges. These hinge joints allow flexion and extension and are reinforced by plantar ligaments, as well as by medial and lateral collateral ligaments.

Characteristics

The bases of the proximal phalanges are concave to allow for articulation with the metatarsal heads, whilst the heads are trochlear, or pulley shaped. Like the metatarsals, the shafts of the proximal phalanges are convex dorsally but concave on their plantar aspect.

Proximal phalanges of the foot (lateral-right view)

The small, middle phalanges are broader than their proximal counterparts.

The distal phalanges are flatter and smaller than the ones in the hand. They consist of a broad base for articulation with the middle phalanges as well as a non-articular head. A rough, crescent shaped tuberosity is present on the plantar surface of the heads, which supports the pads or pulps of the toes.

Distal phalanges of the foot (lateral-right view)

Muscle attachments

Proximal phalanges

Many muscles of the foot attach to the phalanges. The muscles that attach to the proximal phalanges include:

  • Lumbricals – medial aspect of the four lateral phalanges
  • Interossei – both sides of the second, third and fourth proximal phalanges

Middle phalanges

Muscles that attach to the middle phalanges include:

Distal phalanges

Two muscles attach to the distal phalange of the hallux:

Muscles that attach to the four lateral distal phalanges include:

Blood supply

The dorsal digital arteries supply the proximal and middle phalanges. The middle phalanges also receive blood supply from the plantar digital arteries. These arteries also supply the distal phalanges.

Innervation

The dorsal and plantar digital nerves innervate all of the phalangeal bones.

Proper plantar digital nerves (inferior view)

Ossification

Ossification is a bone remodelling process where new bone is laid down by osteoblasts, cells involved in synthesising bone. It is an important process in bone development and involves transforming cartilage into bone. The location where ossification begins is referred to as the ossification centre.

The ossification centres for the distal phalanges are the first to appear, between the 9th and 12th week of development. This is followed by appearance of the ossification centres for the proximal phalanges between the 11th and 15th weeks of development. The development of the middle phalanges usually occurs soon after their proximal counterparts.

Phalanges of the foot: want to learn more about it?

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