Turf Toe

Turf toe is a hyperextension injury of the first metatarsophalangeal (MTP) joint: the toe is forced into dorsiflexion while the forefoot is fixed on the ground. The structure it injures is the plantar plate complex, and the Anderson grade of that injury guides management.

The name. The term was coined in 1976 (Bowers and Martin) after American football moved from grass to artificial turf. The harder, less forgiving surface, combined with lighter and more flexible shoes, allowed excessive first MTP dorsiflexion, and the original Arkansas series (Coker 1978) and subsequent reviews link the rising incidence to this shoe-surface change.

Who. Athletes, in whom it is common: well described in American football, and also seen in soccer, rugby, basketball, dance and wrestling. The peak is in adolescent and young adult athletes, roughly 15-35 years, and the sex distribution reflects participation in high-risk contact and cutting sports.

Risk factors. The injury is more frequent on hard artificial surfaces than on natural grass.

• Artificial turf - hard and less forgiving
• Flexible-soled shoes - allow excess MTP dorsiflexion
• Previous turf toe
• Hallux rigidus or prior first MTP disease - altered biomechanics
• First ray hypermobility

The plantar plate complex. The injured structure is not just the plantar plate. The complex comprises the fibrocartilaginous plantar plate, both sesamoids, the flexor hallucis brevis (FHB) insertions and the plantar capsule, and injury to any component can cause turf toe syndrome. Together it provides 90% of plantar restraint to hyperextension, with the collateral ligaments contributing stability.

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The plantar plate. A fibrocartilaginous structure of type II collagen, 8-10mm thick plantarly and thinning dorsally, that runs from the plantar surface of the metatarsal neck to the base of the proximal phalanx. Its superficial layer blends with the plantar fascia, its deep layer attaches to the sesamoids, and laterally it integrates with the collateral ligaments.

It is the primary restraint to MTP hyperextension and resists forces up to 45 degrees of dorsiflexion. Beyond this threshold, rupture occurs.

The sesamoid complex. Sesamoid pathology often coexists with plantar plate injury.

• Tibial (medial) sesamoid - the larger of the two and directly weight-bearing. It is the more commonly injured, being exposed to valgus forces, and a bipartite variant in 10-30% can mimic a fracture
• Fibular (lateral) sesamoid - smaller, less commonly injured, protected by adductor hallucis
• Intersesamoid ligament - connects the two sesamoids and creates the groove for the FHL tendon. Its rupture causes sesamoid diastasis, a Grade 3 finding
• FHB insertions - medial head to the tibial sesamoid, lateral head to the fibular sesamoid, providing active plantar flexion
• Sesamophalangeal ligaments - connect the sesamoids to the proximal phalanx

Load at push-off. In normal gait the first MTP bears 40-60% of forefoot load at push-off. The sesamoids distribute that pressure over a larger area, and FHB generates the plantar flexion force for propulsion.

The push-off deficit. When the complex fails, the sesamoids migrate proximally, FHB loses its mechanical advantage and propulsive force falls. These changes explain the functional deficit in turf toe.

The mechanism. Hyperextension of the first MTP joint while the forefoot is fixed on the ground. The detail that makes the mechanism work, and that is usually omitted, is that the heel must be raised: the ankle is in fixed equinus. An axial load down a leg with the foot flat cannot hyperextend the hallux; only when the heel is off the ground, and body weight or an opponent's weight drives down through the back of the leg, is the proximal phalanx levered into dorsiflexion against a planted toe.

The setting. The classic description is a player driving forward off the toe, or being landed on from behind in that position, as when a tackler lands on the heel. Cleats caught in the turf fix the forefoot, and high-velocity sports such as football, soccer and rugby contribute. The injury tracks with hard artificial turf plus flexible-soled shoes: turf does not absorb energy, and a flexible forefoot lets the joint reach the end of its range while the surface refuses to let the toe slide.

How the plate fails. Body momentum continues forward and drives the proximal phalanx into dorsiflexion beyond the 45-degree threshold, and the plantar plate fails in tension. Failure propagates distal to proximal through the plantar plate and sesamoid complex, which is why the sesamoids lose their distal tether and may displace proximally. The extent of the failure is the grade:

• Grade 1 - stretching without macroscopic tear
• Grade 2 - partial tear, usually distal to the sesamoids
• Grade 3 - complete rupture with sesamoid displacement

What follows. The capsule, collaterals and surrounding soft tissues are injured with the plate, and push-off is lost. Acute haemorrhage into the plantar capsule and an inflammatory response bring swelling and oedema. Scar formation may cause stiffness, sesamoid healing may end in nonunion, and chronic instability follows if the injury is not treated properly.

Grade 1 or Grade 2. The Grade 1 patient can walk with minimal discomfort and returns in days. Grade 2 brings a significant antalgic gait and difficulty with push-off, and return is measured in weeks.

Grade 2 or Grade 3. Stability and sesamoid position separate them. Grade 2 has moderate swelling, a stable joint and normal sesamoid position; Grade 3 has severe swelling, an unstable joint and proximal sesamoid migration. Accurate grading guides treatment and prognosis counselling, and for Grade 3 look for:

• Sesamoid proximal migration over 50%
• Sesamoid diastasis from intersesamoid ligament rupture
• A positive vertical instability test
• Traumatic hallux valgus

Associated injuries. Always evaluate for these in Grade 2-3 turf toe.

• Sesamoid fracture - often associated with Grade 2-3. Sharp fracture margins distinguish it from the smooth edges of a bipartite sesamoid
• Traumatic hallux valgus - rupture of the medial capsule lets the great toe drift laterally, and may require surgical correction
• Osteochondral lesion - of the metatarsal head or proximal phalanx. Loose bodies may develop; consider arthroscopy if symptomatic
• FHL injury - associated in severe injuries; check for weakness of IP flexion

History. Immediate pain at the great toe after forced hyperextension during sport, often on artificial turf in flexible-soled shoes or cleats. The athlete may report a "pop" or tearing sensation, and has difficulty with push-off and an antalgic gait.

Examination. Swelling and ecchymosis, plantar more than dorsal, with tenderness plantar to the first MTP and point tenderness over the sesamoids. Passive dorsiflexion is painful, FHB is weak on the push-off test, and the gait avoids toe-off.

The vertical instability test. Stabilise the metatarsal head and apply a vertical force to the proximal phalanx: more than 2mm of dorsal translation is positive and is regarded as pathognomonic of Grade 3, although the threshold has not been rigorously validated (see Controversies).

Radiographs. They cannot assess the soft-tissue injury, but they show sesamoid position and fracture.

• AP foot - weight-bearing if possible
• Lateral foot - sesamoid position
• Oblique foot - additional detail
• Sesamoid view - axial projection

What to look for. Sesamoid fracture with sharp margins (a bipartite sesamoid may mimic one), sesamoid proximal migration, joint subluxation or diastasis, and avulsion fractures of the plantar base of the phalanx. Always compare sesamoid position with the contralateral foot: proximal migration over 50% means complete rupture, and diastasis means intersesamoid ligament rupture. On dorsiflexion views, loss of the sesamoids' normal distal excursion is a useful sign.

MRI is the gold standard and the imaging modality of choice for the soft tissue. Use T1, T2 and STIR sequences in axial, sagittal and coronal planes, with a small field of view focused on the first MTP. It is essential for surgical decision-making, and the indications are:

• All Grade 2-3 injuries
• Surgical planning
• Grade unclear from clinical examination
• Persistent symptoms despite treatment

Ultrasound can assess the plantar plate in experienced hands and allows dynamic assessment of sesamoid motion, but it is operator dependent and gives less detail than MRI.

CT is best for sesamoid fracture assessment, useful when bipartite sesamoid versus fracture is unclear, with 3D reconstruction for complex injuries.

Bone scan is rarely indicated. It may show stress reaction, and has been superseded by MRI.

The goal. Restore pain-free push-off and prevent chronic instability. The grade determines the intensity of treatment, but every athlete returns to sport in a turf toe plate (see Rehabilitation).

Who needs surgery. Very few: fewer than 2% of all turf toe injuries require operative repair (Gupta 2023), reserved for unstable Grade III and bony injury. Grades 1 and 2 are treated conservatively; Grade 3 is immobilised for a conservative trial, and surgery is considered when the indications below are met.

Algorithm

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Post-traumatic hallux rigidus. First MTP arthritis from cartilage damage is the most significant long-term complication. It may eventually require cheilectomy or fusion, and prevention lies in adequate initial treatment and protection. Examiners often follow a turf toe question straight into it, so know how it is graded and managed.

Mild to moderate disease. For grades 1-2 and early 3 with reasonable cartilage, cheilectomy (excision of the dorsal osteophyte plus the dorsal ~25-30% of the metatarsal head) relieves dorsal impingement and improves dorsiflexion. A Moberg dorsal closing-wedge phalangeal osteotomy can be added to shift the motion arc into dorsiflexion.

Severe disease. For grades 3-4, first MTP arthrodesis is the gold standard, with reliable pain relief. The joint is fused at roughly 10-15 degrees of dorsiflexion relative to the floor and 10-15 degrees of valgus, with neutral rotation.

Implants. Implant arthroplasty is generally avoided at the first MTP in young and active patients, given the historically high failure and osteolysis with silastic and metallic implants. Synthetic-cartilage implants (e.g. polyvinyl-alcohol) are an alternative with mixed evidence, but fusion remains the durable choice for the active athlete after turf toe.

The turf toe plate. A carbon-fibre or steel-shank insole that limits MTP dorsiflexion, and the standard for return to sport. It restricts the injurious dorsiflexion arc and is the cornerstone of recurrence prevention, although high-quality trials quantifying recurrence reduction are lacking (see Controversies). All athletes with turf toe should use one for return to sport, and stiffer-soled shoes and high-top footwear or cleats are also worth considering.

Prognostic factors. The outlook is better after a Grade 1-2 injury with a stable MTP joint and no sesamoid migration, with early diagnosis and treatment, compliance with rehabilitation and proper prevention with a turf toe plate. It is worse with Grade 3 instability, sesamoid proximal migration, traumatic hallux valgus, delayed presentation, premature return to sport and cartilage injury on MRI.

Outcomes by grade. The figures below come from the reviews by Gupta et al. (2023) and McCormick & Anderson (2010).

• Grade I - return as tolerated, typically 3-5 days; players generally regain prior performance
• Grade II - approximately 2-4 weeks lost; good recovery with protected return and taping support

Grade III. The two reviews quote different numbers, and they are measuring different things: 4-6 weeks or more of play lost, against at least 10-16 weeks to actual recovery, with operative rehabilitation running through four phases to around 20 weeks. Time out of competition is shorter than time to a fully recovered toe, and quoting the smaller figure to an athlete sets an expectation the injury will not meet. About 70% of higher-grade injuries maintain their prior performance level, whether treated operatively or not, which is the honest headline for a "minor" injury.

Chronic sequelae. Clanton's long-term series reported persistent symptoms in roughly half of athletes at over 5-year follow-up, including hallux rigidus.

Turf toe is a soft-tissue sports injury, so there is no implant registry and no single high-level guideline; practice is driven by expert reviews and society sports-medicine guidance. The principles below are consistent worldwide across examination frameworks.