Jones Fractures

The Jones fracture is a fracture at the metadiaphyseal junction of the fifth metatarsal base, Zone 2 of the three proximal zones. Sir Robert Jones described it in 1902, having sustained the injury himself while dancing. It is notorious for its high nonunion rate and prolonged healing time.

The three zones. The proximal fifth metatarsal is divided into three zones, and the zone is the first thing to settle because the three heal so differently:

• Zone 1 (tuberosity avulsion): extra-articular or involving the metatarsocuboid joint; the most common proximal fifth metatarsal fracture; benign.
• Zone 2 (true Jones fracture): at the metadiaphyseal junction, with the fracture line extending into the fourth-fifth intermetatarsal articulation; lies in the vascular watershed.
• Zone 3 (proximal diaphyseal stress fracture): distal to the 4-5 joint within the proximal 1.5cm of the diaphysis; usually a fatigue or stress injury with prodromal symptoms, and the highest nonunion risk.

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Not everyone draws the line between Zones 2 and 3. Some authors, and the Torg series, argue that the fine anatomical distinction between Zone 2 and Zone 3 matters less than chronicity (sclerosis and canal obliteration) and patient demand, since outcomes track these factors rather than the precise level (Chuckpaiwong 2008).

Who. Peak incidence is in young, active adults, and the injury is strongly associated with running, cutting, pivoting and jumping sports.

Predisposing factors. Cavovarus or hindfoot varus alignment concentrates load on the lateral column, and cavovarus that is not addressed is a recognised cause of refracture. The others are gastrocnemius tightness, metatarsus adductus, a prior fifth metatarsal injury, training-load error and inadequate footwear.

Zone 2 boundaries. Zone 2 runs from the level of the fourth-fifth intermetatarsal articulation proximally to the junction of metaphysis and diaphysis distally. Its defining feature is that the fracture line extends into the 4-5 intermetatarsal joint: a Zone 1 avulsion lies proximal to that joint and a Zone 3 stress fracture distal to it. The question to ask of the radiograph is whether the line enters the 4-5 articulation; if it does, this is a Jones fracture.

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The watershed. The nutrient artery enters the medial cortex at the proximal metaphysis, metaphyseal arteries supply the proximal cancellous bone, and periosteal vessels supply the diaphysis from distally. Zone 2 is where the nutrient artery supply meets the periosteal supply, so it is relatively avascular compared with Zone 1, which has rich metaphyseal blood, and Zone 3, which has the periosteal supply. The scaphoid waist and the central third of the navicular are the same idea.

Why it matters. Healing potential at the watershed is compromised: the nonunion rate with conservative treatment is 25-50%, union is slower even with appropriate treatment, and a delayed union or nonunion goes on to sclerosis, which is what the Torg Type II and III appearances record.

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Mechanism. The fifth metatarsal acts as a lever arm during push-off, peroneus brevis creates a bending moment on it, and hindfoot varus overloads the lateral column. Three loads produce the fracture:

1. An adduction or inversion load on a planted, plantarflexed forefoot
2. Vertical loading with the heel off the ground
3. Repetitive stress in athletes, the acute-on-chronic injury of repetitive lateral-column overload

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Torg classification. The Torg classification is the most widely used system for Jones fractures. It is based on radiographic appearance and indicates chronicity, which is what decides whether bone graft will be needed.

The type maps directly onto the operation, which is set out under Management.

History. Establish whether the onset was acute or insidious, since a prodrome of lateral foot pain points to a chronic component, and ask about activity level (athlete or sedentary, which shapes treatment), any prior fifth metatarsal fracture, and when the symptoms began. The features that flag a chronic component:

• Gradual onset of symptoms before the acute event
• A history of similar pain that resolved
• Prolonged activity-related pain
• Previous treatment for lateral foot pain

Examination. Look for lateral foot swelling and ecchymosis, comparing with the other foot. Palpate the whole fifth metatarsal and the peroneal tendons, and locate the point of tenderness, because it maps to the zone:

• Zone 1: at the tuberosity, at the peroneus brevis insertion
• Zone 2: at the metadiaphyseal junction, 1.5cm distal to the tuberosity
• Zone 3: more distal, along the proximal shaft

The rest of the foot. Assess hindfoot alignment, since varus predisposes to lateral overload; gastrocnemius tightness with the Silverskiold test; ankle stability and lateral ligament integrity; and neurovascular status, which is usually intact.

Differential diagnosis. Lateral foot and fifth metatarsal base pain has several mimics. The discriminators are whether the fracture line involves the 4-5 intermetatarsal articulation and whether an accessory ossicle, with its normal corticated margins, is present.

Radiographs. Three views, each answering a different question:

1. AP foot - the best view for identifying the zone
2. Lateral foot - angulation
3. Oblique foot - profiles the fifth metatarsal

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Reading the film. Locate the fracture line relative to the 4-5 joint, then read the fracture for chronicity. The signs that the injury is old, and that bone graft will be needed:

• Sclerotic margins at the fracture site and increased density of the bone ends
• Obliteration of the medullary canal
• A lucent zone around the fracture, with resorption at the fracture edges
• Widening of the fracture line and separation of the fragments
• Periosteal reaction and old callus, the evidence of previous healing attempts

CT. Use it to grade the degree of medullary sclerosis, to plan nonunion surgery, to look for refracture after previous fixation and to assess healing after surgery. It shows canal patency, fracture healing and hardware position.

MRI. Use it for a stress reaction without a fracture line, for soft tissue assessment, for the pattern of marrow oedema and to separate acute from chronic injury. An acute fracture is low signal on T1 and high signal on T2 and STIR, both from marrow oedema; in a chronic fracture the sclerosis is visible.

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The decision. Three questions settle it, in order:

1. Is the patient an athlete requiring rapid return to sport? Yes: intramedullary screw fixation. No: consider non-operative treatment if the fracture is Torg Type I.
2. What is the Torg type? Type I: a screw alone may suffice. Type II: screw, and consider bone graft; some surgeons curet the fracture site; expected healing 10-12 weeks, with a higher refracture risk than Type I. Type III: screw, bone graft and curettage of the medullary canal, which is essential; expected healing 12-16 weeks or more; some use plate fixation if the canal is severely obliterated.
3. Has conservative treatment failed? Yes: surgical fixation is mandatory, with bone grafting considered.

Algorithm

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Non-operative treatment. The candidates are sedentary patients with low functional demands and an acute Torg Type I fracture, who accept the 25-50% nonunion risk. The protocol is a short leg cast with strict non-weight-bearing for 6-8 weeks, serial radiographs every 2-3 weeks, and gradual weight-bearing once radiographic healing is seen; total treatment time runs 12-20 weeks, with return to sport at 4-5 months if healing occurs.

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Operative treatment. The indications are athletes at any level, high functional demands, Torg Type II or III, failed conservative treatment, and the patient who wants a faster return to activity. Athletes need surgery because it gives union and return to sport in 8-10 weeks against 15 or more, a nonunion rate under 5% against 25-50%, and more predictable healing.

Setup and equipment. Supine on a radiolucent table with a bump under the ipsilateral hip, the foot accessible to the C-arm. Have 5.5mm or 6.5mm cannulated screws, guidewires, a cannulated drill and a countersink to hand.

Intramedullary screw fixation.

1. Direct lateral incision over the tuberosity, 2-3cm, protecting the sural nerve
2. Entry point at the tip of the tuberosity, "high and medial"
3. Guidewire under fluoroscopy, confirming a central position
4. Measure screw length; ream if needed, overreaming by 0.5mm only
5. Insert the largest screw the canal accepts and engage the far cortex, which is the plantar bone
6. Final fluoroscopy on AP, lateral and oblique views: adequate compression, no joint penetration, and the head countersunk to avoid prominence

The entry point. Too dorsal places the screw eccentrically; aim for the centre of the medullary canal.

Screw selection. A large, 5.5mm or greater, solid screw is recommended in elite athletes, because undersized hardware is a recognised cause of refracture and nonunion (Hunt and Anderson 2011). Solid screws are biomechanically stronger than cannulated ones, and the screw must cross and compress the fracture and "fit and fill" the canal. Read the 5.5mm figure for what it is, an expert recommendation rather than a tested threshold, and apply it canal permitting: a screw too wide for the canal wedges and straightens the curved metatarsal, so use the largest diameter the canal will accept without doing that.

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Bone grafting. Required for Torg Type II with significant sclerosis, Torg Type III nonunion and revision surgery. Iliac crest autograft is the gold standard; proximal tibia offers less morbidity, and calcaneus can be taken from the same operative field. Curet the sclerotic bone from the medullary canal, pack morselised graft into the canal and, if wanted, around the fracture site, then insert the intramedullary screw. Where the canal cannot accommodate a screw, plantar plating is the alternative.

Biological adjuncts. Because the watershed biology is the limiting factor, union can be augmented alongside mechanical fixation. Autograft is the gold-standard graft for sclerotic delayed unions and nonunions; bone marrow aspirate concentrate (BMAC) plus demineralised bone matrix (DBM) is a lower-morbidity biological alternative used in elite-athlete series (Hunt and Anderson; Lareau). Low-intensity pulsed ultrasound (LIPUS) and other bone stimulators are non-invasive adjuncts used to promote union, particularly in delayed union or as an add-on after fixation in high-demand athletes; the evidence is supportive but not definitive, so they supplement, never replace, adequate fixation, canal preparation and correction of biomechanical risk (cavovarus, smoking). They are an adjunct, not a primary treatment.

Nonunion. The risk factors are conservative treatment (the 25-50% rate), Torg Type II or III at presentation, inadequate immobilisation, early weight-bearing, smoking and diabetes. Treatment is surgical fixation with bone graft and curettage of sclerotic bone, with a larger screw or plate fixation considered.

Refracture. The best-evidenced risk factor is early return to sport before radiographic union: Larson's failures returned at a mean of 6.8 weeks against 9 weeks in those who did not fail, and only 1 of 6 failures had complete union when cleared. Elite competition level, hardware removal and residual cavovarus alignment are also implicated. Small screw diameter is widely blamed but poorly evidenced: Larson found no significant difference in screw diameter between failures and successes, so the case for a large screw rests on expert recommendation (Hunt and Anderson) and mechanics rather than comparative data.

Preventing refracture. Delay clearance until complete radiographic union, not merely absence of pain and "progress"; Larson's failures were all asymptomatic and progressing when released. Address cavovarus with an orthosis or a lateralising osteotomy where present, and consider leaving the hardware in place long-term.

Hardware. A prominent screw head may need removal after healing, a screw that backs out requires revision fixation, and breakage is rare with an adequately sized screw.

Sural nerve injury. Caused by an entry point too plantar or by retraction. Prevention is entry at the tip of the tuberosity, careful soft tissue handling and direct visualisation.

Rehabilitation. The postoperative timeline, which is also the athlete protocol:

• Weeks 0-2: posterior splint, non-weight-bearing, with elevation and ice for swelling
• Weeks 2-6: CAM boot with progressive weight-bearing in the boot; range-of-motion exercises out of the boot; pool therapy if available
• Weeks 6-8: athletic shoe with full weight-bearing; progressive strengthening including stationary bike and swimming
• Weeks 8-10: sport-specific training with a cutting and jumping progression; return to play when the criteria are met

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Return to sport criteria. Return to play requires:

1. Pain-free with sport-specific activities
2. Full range of motion
3. Normal strength, demonstrated by the single-leg hop test
4. Radiographic evidence of healing with bridging callus

After surgery. The pooled union rate with intramedullary screw fixation in athletes is approximately 97% (Attia 2021 meta-analysis), and return to sport averages 9-10 weeks. The overall refracture rate is approximately 10% in athletic cohorts. Hardware removal is rarely needed unless symptomatic.

Without surgery. Union in a cast is 50-75% for Torg Type I, the refracture risk is higher than after surgery, and the option is best reserved for non-athletes with Type I fractures. Time to union, when it happens, is given as anywhere from 6-12 weeks to 15-20 weeks, and the evidence cards below show why the spread is so wide: Torg's non-weight-bearing cast patients united in a mean of 7 weeks, whereas Mologne's cast arm took a median of 14.5 weeks.

Global Epidemiology

Proximal fifth metatarsal fractures are among the most common forefoot injuries, and the Zone 2 (Jones) and Zone 3 (proximal diaphyseal stress) patterns are over-represented in cutting and pivoting field sports worldwide - American football, basketball, soccer, rugby and Australian Rules football. Their disproportionate impact on elite athletes (high-profile in-season injuries in the NFL, NBA and European football) has driven a strong international convergence toward early operative fixation in this population (Attia 2021 meta-analysis; Porter 2017).

Side-by-Side Guidance and Evidence Synthesis

There is no single high-level society practice guideline dedicated to Jones fractures; practice is instead anchored on synthesised evidence and expert consensus. The dominant positions across major bodies and the strongest evidence are summarised below.

Registry and Real-World Evidence

Unlike arthroplasty, there is no dedicated international Jones-fracture registry; population-level data derive from large athletic cohorts and league injury surveillance (e.g. NFL and professional soccer datasets), which consistently report return-to-play rates above 95% with operative treatment and a persistent refracture rate of roughly 10% (Attia 2021; Lareau 2016). These real-world series confirm that the principal modifiable failure factors are undersized hardware, inadequate biology in sclerotic fractures, uncorrected cavovarus alignment, and premature return to sport before radiographic union (Larson 2002; Hunt and Anderson 2011).

Practice Variation

International practice varies chiefly at the margins rather than the core: the threshold for operating on the recreational or sedentary patient, routine use of biological augmentation (bone marrow aspirate concentrate, demineralised bone matrix, autograft), choice between cannulated and solid screws, and the aggressiveness of return-to-sport timelines. Plantar plating is reserved for revision or canals that cannot accommodate an adequate screw.

Prevention and Modifiable Risk Factors

• Training-load management: avoid rapid increases in cutting, pivoting and lateral-column loading to reduce acute-on-chronic Zone 2/3 stress injury in field-sport athletes.
• Biomechanical correction: address hindfoot varus / cavovarus and gastrocnemius tightness; uncorrected cavovarus is a recognised cause of refracture.
• Footwear: appropriate sport-specific footwear and lateral-support orthoses to offload the lateral column.
• Smoking cessation: smoking impairs union and is a modifiable nonunion risk factor; structured cessation support improves outcomes.