Fifth metatarsal bone
Encyclopedia
The fifth metatarsal bone is recognized by a rough eminence, the tuberosity, on the lateral side of its base.
The base articulates behind, by a triangular surface cut obliquely in a transverse
direction, with the cuboid; and medially, with the fourth metatarsal.
On the medial part of its dorsal surface is inserted the tendon of the Peronæus tertius and on the dorsal surface of the tuberosity that of the Peronæus brevis.
A strong band of the plantar aponeurosis connects the projecting part of the tuberosity with the lateral process
of the tuberosity of the calcaneus.
The plantar surface of the base is grooved for the tendon of the Abductor digiti quinti
, and gives origin to the Flexor digiti quinti brevis.
The base of the metatarsal is often injured and a particularly notorious fracture is the Jones fracture
. When the tuberosity is broken, it is called a pseudo-Jones fracture or a dancer's fracture. This is a common fracture of the fifth metatarsal.
Stress fractures are common in the fifth metatarsal among athletes.
The base articulates behind, by a triangular surface cut obliquely in a transverse
Transverse plane
The transverse plane is an imaginary plane that divides the body into superior and inferior parts. It is perpendicular to the coronal and sagittal planes....
direction, with the cuboid; and medially, with the fourth metatarsal.
On the medial part of its dorsal surface is inserted the tendon of the Peronæus tertius and on the dorsal surface of the tuberosity that of the Peronæus brevis.
A strong band of the plantar aponeurosis connects the projecting part of the tuberosity with the lateral process
Process (anatomy)
In anatomy, a process is a projection or outgrowth of tissue from a larger body. The vertebra has several kinds of processes,such as: transverse process, prezygapophysis, postzygapophysis.-Examples:Examples of processes include:...
of the tuberosity of the calcaneus.
The plantar surface of the base is grooved for the tendon of the Abductor digiti quinti
Abductor digiti minimi muscle (foot)
The Abductor digiti minimi is a muscle which lies along the lateral border of the foot, and is in relation by its medial margin with the lateral plantar vessels and nerves....
, and gives origin to the Flexor digiti quinti brevis.
The base of the metatarsal is often injured and a particularly notorious fracture is the Jones fracture
Jones fracture
A Jones fracture is a fracture of the diaphysis of the fifth metatarsal of the foot. The fifth metatarsal is at the base of the small toe. The proximal end, where the Jones fracture occurs, is in the midportion of the foot. Patients who sustain a Jones fracture have pain over this area, swelling,...
. When the tuberosity is broken, it is called a pseudo-Jones fracture or a dancer's fracture. This is a common fracture of the fifth metatarsal.
Stress fractures are common in the fifth metatarsal among athletes.