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[1] [2] Although generally associated with the fifth toe and big toe, it can occur in any toe. [1] [13] In such a fracture, the hard blow to the tip of the distal phalanx typically results in a transverse or oblique fracture in the proximal phalanx (base of toe), but can occur in any phalanx. [1] [13]
These fractures are sometimes called march fractures, based on their traditional association with military recruits after long marches. The second and third metatarsals are fixed while walking, thus these metatarsals are common sites of injury. The fifth metatarsal may be fractured if the foot is oversupinated during locomotion. [9]
The fifth metatarsal has a rough eminence on the lateral side of its base, known as the tuberosity or the styloid process. The plantar surface of the base is grooved for the tendon of the abductor digiti quinti. The head articulates with the fifth proximal phalanx, the first bone in the fifth toe.
They are analogous to the knuckles of the hand, and are consequently known as toe knuckles in common speech. They are condyloid joints , meaning that an elliptical or rounded surface (of the metatarsal bones) comes close to a shallow cavity (of the proximal phalanges).
Other proximal fifth metatarsal fractures exist, although they are not as problematic as a Jones fracture. If the fracture enters the intermetatarsal joint , it is a Jones fracture. If, however, it enters the tarsometatarsal joint, then it is likely an avulsion fracture caused by pull from the fibularis brevis tendon.
The only movements permitted in the joints of the digits are flexion and extension; these movements are more extensive between the first and second phalanges than between the second and third. The flexor hallucis longus and flexor digitorum longus flex the interphalangeal joint of the big toe and lateral four toes, respectively. The tendons of ...
The phalanges of the foot differ from the hand in that they are often shorter and more compressed, especially in the proximal phalanges, those closest to the torso. [3] A phalanx is named according to whether it is proximal, middle, or distal and its associated finger or toe. The proximal phalanges are those that are closest to the hand or foot.
Proximal fractures of 5th metatarsal. The tuberosity avulsion fracture (also known as pseudo-Jones fracture or dancer's fracture [2] is a common fracture of the fifth metatarsal (the bone on the outside edge of the foot extending to the little toe). [3] This fracture is likely caused by the lateral band of the plantar aponeurosis (tendon). [4]