Metatarsal fractures account for a significant proportion of foot injuries, representing 35% of all foot fractures and 5% to 6% of all skeletal injuries, with an estimated incidence of 6.7/10 000 people. 5,28,41,42 These injuries are more common in females (2:1) in the general population, although in the athletic population, they are seen most commonly in males. 28,37,41,42 Patients in their second through fifth decade of life most commonly sustain metatarsal fractures, with a mean age of 42.28 Most metatarsal fractures occur by low-energy trauma, although they can also occur from penetrating trauma.28 Anatomically, the metatarsals fall into 3 groups: first, fifth, and central metatarsals. In a population study investigating metatarsal fractures, fifth metatarsal fractures occurred most commonly, followed by middle metatarsals and the first metatarsal.
28Although most first and fifth metatarsal fractures are isolated fractures, multiple metatarsal fractures often occur in contiguous bones. If a fracture is identified in a single metatarsal, the orthopedist must closely inspect adjacent metatarsals and joints, especially the Lisfranc articulation.28 Stress fractures can also occur in metatarsals, most commonly in the second metatarsal but also not uncommonly in the third and fifth metatarsal. They are seen typically in women with osteoporosis and athletes with repetitive stress injuries, which includes groups as diverse as ballet dancers and military recruits.
36The appropriate and successful management of these fractures requires knowledge of the anatomy, pathophysiology, and treatments for each of the metatarsal fracture groups. Unfortunately, outcomes are generally less predictable in patients with risk factors such as obesity and diabetes.5 This review focuses on acute metatarsal fractures, with only a cursory discussion of stress fractures and Lisfranc injuries.
First and Central MetatarsalsFractures involving the first and central (second through fourth) metatarsals can vary significantly, including stress and acute traumatic fractures. First metatarsal fractures are not as common as central metatarsal fractures. 28 There is a 60% rate of contiguous fractures when patients sustain fractures involving the central metatarsals.
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AnatomyFirst Metatarsal. The first metatarsal is larger than the lesser 4 metatarsals. Distally, there is the transmetatarsal ligament in the first webspace. The resting position of the first tarsometatarsal joint is supported by a capsule containing strong, thick ligaments. The first metatarsal base is the site of attachment for 2 powerful muscles, tibialis anterior and peroneus longus. The first metatarsal head overlies the 2 sesamoid bones, which provides 2 of the 6 contact points of the forefoot and allows the first ray to support up to 40% of the forefoot weight. The blood supply is primarily from a single nutrient artery with secondary epiphyseal and metaphyseal arteries.Central Metatarsals. The central metatarsals have significant ligamentous structures that link each bone to ...