Orthopaedic Surgery - Jones Fracture

Basics

A Jones fracture is a fracture involving the proximal fifth metatarsal, near the metaphyseal-diaphyseal junction of the foot.

Proximal fifth metatarsal fractures may occur acutely after trauma or develop gradually as a stress fracture.

Because prognosis and treatment vary substantially according to fracture location, these injuries are commonly divided into three anatomic zones.

Classification

Zone 1: Tuberosity Avulsion Fracture

Zone 1 fractures involve the fifth metatarsal tuberosity.

They usually do not extend into the fourth-fifth intermetatarsal articulation.

These injuries are commonly called avulsion fractures or pseudo-Jones fractures.

They often result from traction by the peroneus brevis tendon or lateral plantar fascia during an inversion injury.

Zone 2: True Jones Fracture

A true Jones fracture occurs at the metaphyseal-diaphyseal junction.

The fracture extends into the fourth-fifth intermetatarsal joint.

This location has a relatively vulnerable blood supply and therefore carries a greater risk of delayed union and nonunion than a Zone 1 avulsion fracture.

Zone 3: Proximal Diaphyseal Stress Fracture

Zone 3 fractures are located in the proximal fifth metatarsal diaphysis, distal to the classic Jones fracture region.

They frequently represent repetitive stress injuries rather than a single acute traumatic event.

These fractures can also have a substantial risk of delayed union or nonunion.

Prevention

Athletes who develop persistent pain over the lateral border of the foot should be evaluated early.

When a stress injury is suspected, timely imaging and activity modification may prevent progression from a stress reaction to a complete fracture.

Epidemiology

Fifth metatarsal fractures are common, particularly in physically active individuals.

Metatarsal fractures can occur at any age, with an average age of approximately 42 years reported in some series.

Frequency

The fifth metatarsal is the most commonly fractured metatarsal.

Approximately 63% of all metatarsal fractures have been reported to involve the fifth metatarsal.

Sex

Some series report a higher overall frequency of metatarsal fractures in females, although athletic Jones fractures are also common in young male athletes.

Athletic Population

Jones fractures are especially important in sports requiring repeated:

Running, jumping, cutting, acceleration, and change of direction.

Historical reports suggest that approximately 1.8% of professional football players may sustain a Jones fracture during their careers.

Risk Factors

Important risk factors include:

Athletic participation, repetitive high-impact activity, falls, direct trauma to the lateral foot, osteoporosis, and abnormal foot alignment.

Cavus Foot

A cavus or cavovarus foot increases loading along the lateral column of the foot and may predispose to fifth metatarsal stress injury or recurrent fracture.

Etiology

The mechanism varies according to fracture type.

Zone 1 Avulsion Fracture

These fractures commonly occur during an inversion or internal-rotation injury of the foot.

The sudden traction force at the fifth metatarsal base avulses the tuberosity.

Zone 2 Jones Fracture

A Jones fracture may result from:

Inversion, plantarflexion with forefoot loading, twisting injury, or repetitive athletic stress.

Zone 3 Diaphyseal Fracture

These injuries may occur from:

Repetitive stress, indirect twisting, or direct trauma.

Chronic stress fractures are particularly common in high-level athletes.

Diagnosis

Signs and Symptoms

Patients typically develop:

Pain, swelling, and focal tenderness along the lateral border of the foot near the base of the fifth metatarsal.

Weight Bearing

Walking often increases pain.

Athletic movements such as:

Running, jumping, cutting, or changing direction

may produce particularly severe symptoms.

Physical Examination

Palpation

There is usually point tenderness over the proximal fifth metatarsal.

The precise location of maximal tenderness can help distinguish a tuberosity avulsion from a true Jones fracture or more distal diaphyseal injury.

Swelling

Swelling and occasionally erythema or bruising may be present.

Weight-Bearing Examination

Patients commonly experience pain with standing or walking.

Some acute fractures prevent normal weight bearing entirely.

Foot Alignment

The examiner should evaluate for:

Cavus or cavovarus alignment, which increases mechanical stress along the lateral ray.

Imaging

Plain Radiographs

Initial imaging should include:

AP, lateral, and oblique radiographs of the foot.

These views help define:

Fracture location, displacement, comminution, and involvement of adjacent joints.

MRI

MRI is useful when:

Plain radiographs are normal or equivocal but clinical suspicion for a stress fracture remains high.

It can detect early marrow edema and stress reaction before a clear fracture line develops.

CT

CT may be helpful when evaluating:

Delayed union, suspected nonunion, postoperative healing, or bony union after previous fixation.

Pathophysiology

The region of the fifth metatarsal metaphyseal-diaphyseal junction has a relatively tenuous blood supply.

Watershed Region

This vascular watershed area contributes to the higher incidence of delayed union and nonunion in true Jones fractures.

For this reason, Zone 2 injuries require more cautious management than typical Zone 1 avulsion fractures.

Zone 3 stress fractures may also heal slowly because repetitive loading can overwhelm the local healing response.

Differential Diagnosis

Important alternatives include:

Lisfranc injury, fifth metatarsal stress fracture, cuboid fracture, peroneal tendon strain or tear, and lateral ankle sprain.

Lisfranc Injury

Pain extending into the midfoot, plantar bruising, or tenderness at the tarsometatarsal joints should raise concern for a Lisfranc injury.

Peroneal Tendon Injury

Peroneus brevis or longus tendon pathology can cause lateral foot pain and may mimic a fifth metatarsal fracture.

Treatment

Treatment depends on the fracture zone, displacement, chronicity, activity level, and patient expectations.

Zone 1 Tuberosity Avulsion Fracture

Most Zone 1 fractures are treated nonoperatively.

Weight Bearing

Weight bearing is generally permitted as tolerated, using:

A stiff-soled shoe, walking boot, splint, or short cast for comfort.

Healing

Clinical healing commonly occurs within approximately 6–12 weeks.

Radiographic union may lag behind clinical recovery.

Displacement

Even considerably displaced avulsion fragments may heal satisfactorily without surgery if joint congruity and function remain acceptable.

Symptomatic Nonunion

Nonunion is uncommon and often asymptomatic.

If a persistent painful nonunion occurs, options may include:

Fragment excision with reattachment of the peroneus brevis tendon or other reconstructive tendon procedures.

Zone 2 Jones Fracture

True Jones fractures require more cautious treatment because of their relatively high nonunion risk.

Nonoperative Treatment

In lower-demand patients with an acute fracture, treatment may consist of:

Strict non-weight-bearing immobilization in a below-knee cast or boot for approximately 6 weeks, followed by gradual protected weight bearing as healing progresses.

The total immobilization and protection period may extend for several additional weeks.

Return to Activity

Return to unrestricted athletic activity may require approximately 3–5 months with nonoperative management, depending on healing.

Chronic Stress Injury

Chronic or stress-related Jones fractures are less likely to heal predictably with casting alone.

These injuries are more likely to require operative fixation.

Zone 3 Proximal Diaphyseal Stress Fracture

Nonoperative treatment generally requires a prolonged period of non-weight bearing, often at least 6–8 weeks or longer, until progressive healing is demonstrated.

Because these fractures frequently represent chronic stress injuries, operative treatment is commonly considered in athletes or delayed unions.

Activity

Zone 1

Activity may progress according to pain and tolerance.

Zones 2 and 3

Patients are generally restricted from full weight bearing initially.

Progression to weight bearing depends on:

Symptoms, fracture type, radiographic healing, and whether operative fixation was performed.

Physical Therapy

Formal physical therapy is rarely necessary during the initial healing phase.

After union, rehabilitation may focus on:

Range of motion, strength, balance, proprioception, gait, and gradual return to sport.

Surgery

Indications

Surgical treatment may be considered for:

Competitive athletes, chronic stress fractures, delayed union, nonunion, recurrent fractures, or fractures requiring a faster and more predictable return to high-level activity.

Intramedullary Screw Fixation

The most common operation is percutaneous intramedullary screw fixation.

A screw is passed down the medullary canal of the fifth metatarsal to compress and stabilize the fracture.

Competitive Athletes

Competitive athletes frequently undergo early fixation because surgery may provide:

Higher union rates, earlier weight bearing, and faster return to sport than prolonged casting.

Postoperative Weight Bearing

Protected weight bearing may begin relatively early in selected surgically treated patients, sometimes after approximately 2 weeks, depending on fixation, symptoms, and surgeon protocol.

Return to Sport

Athletes may return when there is:

No pain or focal tenderness, satisfactory functional recovery, and convincing evidence of healing.

Return commonly occurs around 8–12 weeks or later after successful operative fixation.

Return based solely on time should be avoided.

Surgery for Zone 3 Fractures

Proximal diaphyseal stress fractures may also be treated with intramedullary screw fixation, particularly when:

The athlete requires earlier return, sclerosis is present, or previous nonoperative treatment has failed.

Bone grafting may occasionally be added in established nonunion.

Surgery for Zone 1 Avulsion Fracture

Surgery is rarely required.

For persistent symptomatic nonunion, the fragment may be excised and the peroneus brevis tendon reattached.

Follow-Up

Prognosis of Zone 1 Fractures

The prognosis for tuberosity avulsion fractures is excellent.

Most patients regain normal function with conservative treatment.

Prognosis of Jones Fractures

Jones fractures have a less predictable natural history because of the vulnerable local blood supply.

Older series reported nonunion or delayed-union rates as high as approximately 40–60% with nonoperative treatment, although outcomes vary according to fracture chronicity, patient selection, and treatment protocol.

Surgical Prognosis

Intramedullary fixation generally produces:

Higher rates of union and earlier return to activity, particularly in athletes.

Complications

Delayed Union

Healing may progress more slowly than expected, particularly in Zone 2 and Zone 3 injuries.

Nonunion

Persistent lack of healing is one of the most important complications.

Risk is increased by:

Poor blood supply, chronic stress injury, premature return to sport, smoking, inadequate immobilization, and recurrent loading.

Refracture

Refracture may occur, particularly in highly competitive athletes.

Risk increases if the patient returns to high-impact sport before biological healing is complete.

Hardware Failure

Intramedullary screws may occasionally:

Break, loosen, bend, or become symptomatic.

Prominent Hardware

Screw prominence may produce local irritation and occasionally require implant removal after complete fracture healing.

Return to Sport

Premature return to competition is associated with a higher risk of:

Persistent fracture, nonunion, and refracture, even after surgical fixation.

Return should therefore be based on a combination of:

Clinical examination, absence of pain and tenderness, functional testing, and imaging evidence of healing.

Patient Monitoring

Patients should undergo serial clinical and radiographic follow-up until fracture healing is established.

Follow-Up Interval

Evaluation at approximately monthly intervals may be appropriate during early healing, particularly for Zone 2 and Zone 3 fractures.

Delayed Union

Delayed union should be suspected when there is minimal radiographic progression by approximately 6–8 weeks, especially if focal pain persists.

Nonunion

A fracture may be considered an established nonunion when there is persistent pain and no meaningful progression toward healing over a prolonged period, often around 6 months, although modern definitions also take clinical and radiographic progression into account.

Long-Term Prevention

In recurrent or stress-related fractures, the clinician should evaluate contributing factors such as:

Cavovarus alignment, training errors, footwear, bone health, nutritional deficiency, and premature return to high-impact activity.

Correcting these factors may reduce the risk of another fracture.