Metatarsal Fractures

Metatarsal fractures are common foot injuries, approximately 35% of all foot fractures, and the fifth metatarsal accounts for nearly 70% of them. They range from simple avulsions through stress reactions to traumatic Lisfranc disruptions.

Which metatarsal. Each ray has its own pattern:

• Fifth - the most common, across Zones 1-3, and the Zone 1 avulsion is the most frequent of all
• Central (second to fourth) - often fractured together; an isolated central fracture is rare and should raise suspicion of Lisfranc involvement
• First - the least common, but the most critical for weight-bearing

Stress fractures. The "march fracture" classically involves the second or third metatarsal shaft. Fifth metatarsal stress fractures (Zone 3) are high-risk.

The columns. The foot's structural integrity depends on the metatarsals' role in the longitudinal and transverse arches. For Lisfranc stability the metatarsals and the bones they articulate with are grouped into three columns:

• Medial - first metatarsal and medial cuneiform; flexible
• Middle - second and third metatarsals with the middle and lateral cuneiforms; rigid, the "keystone"
• Lateral - fourth and fifth metatarsals with the cuboid; mobile

The Lisfranc ligament. It runs obliquely from the medial cuneiform to the base of the second metatarsal. There is no ligamentous connection between the first and second metatarsal bases.

Blood supply of the fifth metatarsal base. The base has a dual supply. Metaphyseal arteries feed the tuberosity (Zone 1), and the nutrient artery enters the mid-diaphysis and travels proximally. The junction between the two, the Zone 2 Jones fracture site, is a vascular watershed, and that is what leads to its high nonunion rate. [1]

Load sharing. During gait the first metatarsal takes double the load of the lesser metatarsals and carries roughly a third of forefoot load. The heads sit on a parabola: the second metatarsal is usually the longest, the first and third are slightly shorter and roughly similar, and the fourth and fifth are progressively shorter. That smooth arc distributes forefoot load evenly across the heads.

What malreduction does. Shortening unloads a metatarsal's own head and transfers load to the adjacent heads. Plantar (dorsiflexion-apex) angulation drives the head plantarward so that it bears excess pressure. Either produces a transfer lesion: a painful plantar callosity, metatarsalgia, and sometimes a secondary stress fracture under the overloaded neighbour.

Why the first metatarsal is unforgiving. With that share of the load it has zero tolerance for shortening or malalignment, and a dorsal malunion causes chronic metatarsalgia and can accelerate hallux rigidus. So when fixing any metatarsal, restore length and the plantar plane, not just the coronal alignment. Residual shortening of more than a few millimetres, or plantar angulation, is the mechanism behind late transfer metatarsalgia.

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Lawrence and Botte zones. The fifth metatarsal base is divided into three zones by anatomy and healing potential, and the further distal the zone, the worse the fracture heals: Zone 3 has the highest nonunion rate. The exam favourite is the Zone 2 (Jones) fracture at the watershed. Do not confuse it with the Zone 1 tuberosity avulsion, the pseudo-Jones.

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Hardcastle (Lisfranc). Useful for the associated tarsometatarsal injuries:

• Type A, total - all five metatarsals displaced in one direction
• Type B, partial - the first (B1) or the lesser metatarsals (B2) displaced in isolation
• Type C, divergent - the first and the lesser metatarsals displaced in opposite directions

Torg: chronicity. Lawrence and Botte describe where a proximal fifth metatarsal fracture sits; the Torg classification describes its chronicity and healing potential on the radiograph. The two are complementary, and both are examinable.

• Type I, acute - a sharp, narrow fracture line with no intramedullary sclerosis and no periosteal reaction. Best healing potential; many unite in a non-weight-bearing cast.
• Type II, delayed union - a widened fracture line with some intramedullary sclerosis and evidence of prior periosteal reaction, a fracture that has struggled to heal. Often needs fixation.
• Type III, established nonunion - complete obliteration of the medullary canal by sclerotic bone. Needs operative treatment: curettage or drilling of the sclerotic canal with bone grafting and/or a larger intramedullary screw.

Why chronicity matters. Radiographic chronicity, not the millimetre of location, drives prognosis. Sclerosis or canal obliteration predicts poorer healing and pushes toward surgery, whether the fracture is labelled a "Jones" or a proximal diaphyseal fracture (Chuckpaiwong).

Detailed management is developed in Jones Fractures, with Pseudo-Jones Fractures for the zone 1 tuberosity avulsion that behaves completely differently, Fifth Metatarsal Stress Fractures for the chronic presentation, Metatarsal Stress Fractures for the lesser rays, and Lisfranc Injuries for the midfoot injury that must be excluded alongside any base fracture.

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A high degree of clinical suspicion for Lisfranc injury is required in all midfoot trauma.

History. The mechanism separates a direct blow (crush) from indirect twisting, the Lisfranc pattern. Inability to weight-bear is a significant indicator of instability. When a stress fracture is possible, ask about a recent increase in load, as in military recruits and marathon runners.

Examination. Plantar ecchymosis is pathognomonic for Lisfranc injury. Palpate for point tenderness over the metatarsal bases and the intermetatarsal spaces, then stress the forefoot:

• Midfoot stress test - passive abduction and pronation of the forefoot; pain indicates a Lisfranc injury
• Piano key test - moving the metatarsal head up and down; pain at the base suggests a fracture

Finish with the neurovascular examination: the dorsalis pedis pulse and deep peroneal nerve sensation.

Radiographs are the gold standard, but subtle injuries may require advanced imaging.

Radiographs. AP, lateral and 30° oblique views. The Lisfranc signs are:

• A gap of more than 2mm between the first and second metatarsal bases
• The fleck sign, a bony avulsion in the first intermetatarsal space, which is pathognomonic

Weight-bearing views. Essential for the subtle Lisfranc injury, because a ligamentous injury can look stable on non-weight-bearing films. If weight-bearing is too painful, consider stress radiographs under anaesthesia.

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CT. Superior for identifying small avulsion fractures such as the fleck sign and for assessing articular involvement, and the study for pre-operative planning.

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MRI. The most sensitive test for an early stress reaction, showing bone marrow oedema before cortical changes appear on the radiograph.

Forefoot and midfoot pain has several mimics; the table sets out what discriminates them.

Fifth metatarsal. The zone sets the default, as the Lawrence and Botte table shows: Zone 1 is treated with symptomatic weight-bearing in a boot, and Zone 3 warrants aggressive surgical fixation. Zone 2 is where the judgement lies.

The Zone 2 decision. A non-weight-bearing cast or an intramedullary screw. In athletes, early intramedullary screw fixation gives faster union and return to sport than casting (Mologne), and pooled data support the screw for all Jones fractures in athletes (Attia); both are in the Evidence Base. Outside that group the best strategy is debated (see Controversies). The non-weight-bearing rule for the cast comes from Torg's series; the UK position summarised under Guidelines manages most acute Jones fractures in a boot.

First metatarsal. Because it tolerates no shortening or malalignment, ORIF is indicated for any displacement, angulation, instability or articular step-off.

Central metatarsals (second to fourth). Conservative treatment when angulation is less than 10° and displacement less than 3mm. Surgery is indicated for:

• Multiple (displaced) central metatarsal fractures
• A "floating midfoot" configuration
• Clinical instability
• Significant shortening or plantovalar deformity
• An irreducible closed injury

Nonunion. The Zone 2 and 3 fifth metatarsal fracture is the one that fails to unite: 30-50% of Jones fractures without surgery. Smoking is the most significant risk factor; the others are delayed presentation (more than 6 weeks), premature weight-bearing and an undersized screw (under 4.5mm). Revision is described under Surgical Technique.

Refracture. Follows premature return to sport and occurs in 10-15% of athletes.

Transfer metatarsalgia. The consequence of malunion with plantar angulation or shortening of more than 3mm, the malreduction described under Anatomy and Biomechanics, and prevented by anatomical reduction, above all of the first metatarsal. Treatment starts with metatarsal pads and orthotics; the surgical option is a distal (Weil) shortening osteotomy of the overloaded ray.

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Post-traumatic arthritis. Follows over 50% of Lisfranc injuries and is common even after anatomical reduction. It presents as midfoot stiffness and pain at push-off. Activity modification and stiff-soled shoes come first; arthrodesis of the first, second and third TMT joints is the gold standard and may be required at 2-5 years.

Compartment syndrome. Rare, but an emergency: it follows a high-energy crush (a run-over foot) or multiple metatarsal fractures. Pain out of proportion and a delta pressure under 30mmHg make the diagnosis, and fasciotomy releases all nine compartments:

• Medial, lateral and superficial
• Four interosseous
• Adductor
• Calcaneal

Sequelae are claw toes, sensory loss and stiffness.

Sural neuropathy. A risk of the lateral approach to the fifth metatarsal base, felt as numbness along the lateral border of the foot.

Hardware prominence. Pain over the screw head, treated by removing the hardware after union.

Complex regional pain syndrome. Associated with prolonged immobilisation, and managed with early mobilisation, physiotherapy and the pain clinic.

Recovery depends on the stability of the construct and the biology of the fracture. The general framework:

• 0-2 weeks, protection - splint or backslab, strictly non-weight-bearing, elevation to manage oedema
• 2-6 weeks, mobilisation - transition to a CAM walking boot and gentle toe range of motion, weight-bearing status per the surgeon's protocol for the procedure
• 6-12 weeks, rehabilitation - gradual weight-bearing as tolerated, physiotherapy to strengthen the intrinsic foot muscles

After Lisfranc ORIF. Non-weight-bearing in a cast or boot for 6 weeks, then progressive weight-bearing from 6 to 12 weeks. Screws are removed at 3-4 months, while plates can stay, and return to sport takes 4-6 months at minimum.

After first metatarsal ORIF. Non-weight-bearing for 6 weeks, then a boot with weight-bearing to 12 weeks, progression guided by radiographic union.

Overall prognosis for metatarsal fractures is good, provided structural alignment is maintained.

Zone 1 and central fractures. Excellent. Healing is predictable within 6-10 weeks, and functional return to baseline is standard.

Zones 2 and 3 of the fifth metatarsal. Guarded, with the highest rate of secondary intervention (up to 30%). Return to high-impact sport may take 4-6 months if nonunion develops.

Long term. Post-traumatic arthritis after Lisfranc injury and chronic metatarsalgia after plantar-angulated malunion are the lasting problems.

Global epidemiology:

• Metatarsal fractures account for roughly 5-6% of all fractures and about 35% of foot fractures worldwide; the fifth metatarsal is involved in the majority (commonly quoted ~70% of metatarsal fractures).
• Stress (fatigue) fractures cluster in military recruits, distance runners, dancers and footballers. The 2nd/3rd metatarsal shaft ("march fracture") is the classic fatigue site; proximal 5th metatarsal stress fractures are the high-risk subset.
• Bone stress injuries frequently signal an underlying metabolic problem — screen for the Relative Energy Deficiency in Sport (RED-S) / female athlete triad, low vitamin D, and (in recurrent or atypical cases) coeliac disease.

Side-by-side guidance:

Surgery for the non-elite Jones fracture. Level I evidence supports early screw fixation in athletes, but the optimal strategy for sedentary or low-demand patients is debated. Many heal with non-weight-bearing casting, avoiding hardware and refracture risk.

Screw type and diameter. Larger, solid screws are widely recommended to reduce refracture. High-quality comparative data on the ideal diameter, headed versus headless designs and the added value of bone graft or biologics remain limited.

Primary fusion or ORIF for Lisfranc. Primary arthrodesis is favoured for purely ligamentous injuries. For combined bony-ligamentous patterns the choice between fusion and ORIF, and the timing of routine hardware removal, is still individualised.

Weight-bearing protocols. Early protected weight-bearing after fixation may speed recovery without compromising union, but cautious surgeons still use prolonged non-weight-bearing in watershed-zone fractures. Consensus thresholds are lacking.