Anterior Ankle Impingement — A Clinician’s Guide to the Bony and Soft Tissue Subtypes

A 22-year-old AFL midfielder presents six months after the initial flare. Anterior ankle pain, sharp, reproducible at end-range dorsiflexion. No history of frank instability. A plain weight-bearing lateral X-ray shows a 4 mm tibial spur with a corresponding talar neck osteophyte. He has tried two cortisone injections, six weeks of relative rest, and a vague “ankle mobility” programme. He returns to running. The pinch returns within a fortnight. The surgeon’s letter recommends arthroscopic debridement. The player asks whether anything else can be done.

This is the recurring clinical picture in anterior ankle impingement — a condition whose conservative pathway is under-described in proportion to its prevalence in dorsiflexion-loading sport. Niek van Dijk and Johannes Tol have spent more than two decades reframing how we should think about it. The reframing matters because it changes which patients you keep, which you refer, and which you reassure.

The pathomechanics — and why the old story was wrong

The traditional explanation was a traction injury. Repeated capsular tension at end-range dorsiflexion was said to produce osteophytes at the capsular insertion. Tol and van Dijk’s cadaveric and radiographic work dismantled this. The osteophytes do not sit at the capsular attachment. They sit at the joint margin — tibia anteriorly, talus on the dorsal neck — exactly where the two bones meet during forced dorsiflexion. The lesion is a contact lesion, not a traction lesion. The implication is direct. Repetitive end-range loading drives the pathology. Anything that alters where the talus ends up at peak dorsiflexion — kinematic, muscular, or mechanical — is on the table as a contributor and a target.

The Tol study of fifteen elite soccer players is the cleanest demonstration. Across 150 kicked balls, the plantarflexion angle exceeded the maximum static plantarflexion angle in 39 percent of kicks. Ball impact was made through the anteromedial foot in 89 percent. The kicking ankle is a structure repeatedly driven past its static range, and the contact zone is the same zone that hypertrophies on imaging years later.

The clinical signature shows up across the football codes. Quade Cooper — Wallabies fly-half, kicker by trade — had a long-standing bone spur shaved from the back of his left heel in August 2024 after years of playing through it. Luke Keary, the Sydney Roosters playmaker, had a bone spur removed from his ankle late in 2021 to clean out a chronic problem dating back to a 2019 injury. In AFL the same loading exposure plays out in ruckmen, midfielders and key-position kickers across long careers. Different sports, same mechanism — repeated end-range stress at the same contact zone, year after year.

Two subtypes follow from this.

The bony subtype is the classical “footballer’s ankle” — tibial and talar osteophytes, often a kissing lesion, often anteromedial. The dorsiflexion block is mechanical. End-feel is hard. Imaging is decisive.

The soft tissue subtype is anterolateral more often than not — synovial hypertrophy, scar tissue from prior ligamentous injury, sometimes a thickened Bassett’s ligament (the accessory anterior inferior tibiofibular fascicle present in a wide range of cadaveric series). The dorsiflexion block is softer. Imaging is often non-contributory on plain film. MRI helps.

The two coexist. They respond differently. This is the first decision point.

Classification — why van Dijk wins

Several radiographic systems exist. Scranton and McDermott has been the alternative most often cited. Comparative work has shown the van Dijk system to be the more prognostically informative for arthroscopic outcomes.

The van Dijk grading runs:

• Grade 0 — normal joint, or subchondral sclerosis only
• Grade I — osteophyte present, no joint space narrowing
• Grade II — joint space narrowing, with or without osteophyte
• Grade III — sub-total or total joint space loss

The prognostic gap between Grade I and Grade II is the one that matters clinically. Patients without joint space narrowing do well with debridement at long follow-up. Patients with narrowing do less well, and the conversation shifts.

The clinical examination — keep it simple and keep it provocative

The diagnosis is mostly made by listening and provoking. Pain at the front of the ankle reproduced by passive end-range dorsiflexion, often with the knee flexed to neutralise gastrocnemius contribution, is the cardinal sign. Focal anterior tenderness over the tibiotalar joint line — anteromedial for the bony pattern, anterolateral for the soft tissue pattern — sharpens the picture.

Two tests earn their place every time.

The anterior drawer — not because you expect to find frank instability in a patient with impingement, but because chronic mechanical instability is the substrate on which anterolateral soft tissue impingement develops. If the drawer is positive, you are looking at two problems, not one.

Single-leg weight-bearing dorsiflexion with a knee-to-wall measure, compared side to side. The asymmetry quantifies what the patient feels. It is also the variable you will track through rehabilitation.

Do not stop at the ankle. Subtalar mobility, hallux dorsiflexion, gastrocnemius and soleus length, and proximal kinematics during squat all contribute to where the talus ends up at peak load. The soleus is the one most underweighted in clinic. It is the dominant Achilles load-bearer through walking and slow running, and its activation pattern during late stance shapes peak plantarflexion drive — which in turn shapes the end-range positions that drive impingement in cutting and decelerating sport.

Imaging — choose the question first

Plain weight-bearing lateral X-ray remains the workhorse for the bony subtype. The Tol oblique view — anteromedial impingement view, taken with the leg in 30 degrees external rotation and 4 degrees plantarflexion — substantially improves sensitivity for anteromedial talar neck spurs that the standard lateral misses. If the bony question is the primary question, ask for both views.

MRI is the test for the soft tissue subtype. It identifies synovial hypertrophy, scar in the anterolateral gutter, Bassett’s ligament thickening, and — critically — the great mimic, the osteochondral lesion of the talar dome. CT or cone-beam CT adds precision when the surgeon is mapping bone, particularly when the lateral X-ray is equivocal in a high-grade athlete.

The Baillie and Mayes group has reminded us — in the context of posterior impingement, but the principle generalises — that clinical features in dancers and athletes correlate poorly with MRI findings. The image is not the diagnosis. The provocation is.

The differential — what you must not call impingement

Three diagnoses sit close to anterior ankle impingement and account for most of the misses.

Osteochondral lesion of the talar dome is the great mimic. The history is similar — anterior or deep ankle pain with loading. Clicking, catching, or true mechanical locking shifts the suspicion. Medial dome lesions tend to be posteromedial; lateral lesions tend to be anterolateral and are more often post-traumatic. MRI is mandatory before any patient is committed to a long conservative trial with this picture.

Flexor hallucis longus impingement at the talar tunnel — described by van Dijk in the posteromedial ankle and producing a stenosing tenosynovitis pattern. The pain location and provocation are different, but the dancer with global ankle pain on jumping is the patient in whom you will see both.

Tibialis anterior tendinopathy — pain at the anterior ankle and dorsum, but tendinous on palpation, often worse with resisted dorsiflexion rather than passive end-range.

Conservative management — what the literature actually supports

Estimates from the dance and soccer literature place success rates for conservative management of mixed-subtype anterior ankle impingement in the order of 60 to 70 percent. The honest reading is that this aggregate hides the subtype split. Soft tissue presentations without significant osteophyte respond well. Bony presentations with spurs above approximately 5 mm or with joint space narrowing tend to plateau.

The conservative pathway has four components.

Load modification. Identify and reduce the dorsiflexion-under-load exposure. For the AFL midfielder, this is end-range cutting and deceleration volume. For the goalkeeper, kicking volume and impact angle. For the dancer, the deep plié and grand plié load. Loading is not removed — it is regulated. Patients who avoid all dorsiflexion lose function and gain stiffness.

An anti-inflammatory phase. The role of corticosteroid injection is contested. Ultrasound-guided injection into the anterolateral gutter has been reported to achieve symptom relief in the soft tissue subtype but the durability is variable. Use it as a diagnostic and a runway into rehabilitation, not as the treatment.

Mobilisation. Mulligan’s mobilisation with movement of the talus posteriorly during active dorsiflexion has reasonable evidence for improving dorsiflexion range in subacute lateral ankle sprain. In active anterior impingement the picture is more cautious — some authors have explicitly excluded medical diagnosis of acute impingement from MWM trials. Use it where the dorsiflexion block is soft and posterior glide is comfortable. Do not force it against a hard end-feel with bony block.

Kinematic offload. This is the part of the conservative pathway that most under-utilises the available tools. The driver of impingement is where the talus ends up at peak load. Anything that changes peak dorsiflexion angle, late-stance calf activation, or the heel contact phase has the potential to reduce impingement frequency per gait cycle. Soleus-biased calf rehabilitation, calf-endurance work, kinematic taping, and external offload all sit in this category. The Australian Ballet experience is instructive — Sue Mayes and colleagues have published the company’s four-year injury surveillance showing ankle synovitis and impingement among the most frequent pathologies, and the in-house programme prioritising calf-endurance work (single-leg heel raises to high repetition) has been associated with a marked reduction in surgical referral within the company.

Surgical pathways and when to refer

Arthroscopic debridement is the standard of care for the patient who fails conservative trial and has a clear lesion to address. Long-term outcome data from Tol and colleagues is the most cited reference point — 57 patients followed for a mean of 6.5 years, excellent or good outcomes in 100 percent of patients without osteoarthritis, 77 percent in van Dijk Grade I, falling to 53 percent in Grade II. The newer state-of-the-art reviews place the aggregate success rate above 80 percent across mixed cohorts. Recurrence of osteophytes occurs in a meaningful subset but does not always recapitulate symptoms.

The referral triggers are:

• Failure of an eight to sixteen week structured conservative programme.
• Bony block on examination with osteophyte greater than approximately 5 mm.
• Mechanical symptoms suggestive of loose body or unaddressed osteochondral lesion.
• Persistent functional limitation in a competitive athlete with an end-of-season window.

Return to sport after arthroscopic debridement is typically achievable at six to twelve weeks. The conversation with the patient should distinguish symptom relief from definitive cure. The osteophyte may regrow. The underlying kinematic driver is unchanged unless the rehabilitation addresses it.

Three clinical patterns to keep

The soft tissue anterolateral patient with prior ankle sprain and a normal X-ray will most often respond to a structured conservative programme of relative load modification, anterolateral gutter work, and kinematic loading. Surgery is the second option, not the first.

The bony anteromedial patient with a clear osteophyte, hard end-feel, and Grade 0 or Grade I van Dijk findings is a candidate for a defined conservative trial — eight to twelve weeks — followed by arthroscopic debridement if symptoms persist. Outcomes after debridement in this group are good and durable.

The mixed-grade patient with joint space narrowing is the difficult conversation. Conservative management can buy time and function. Debridement is symptomatic, not disease-modifying. The end-stage discussion belongs to the patient.

The kinematic adjunct — using the Sleeve in the conservative trial

The Orthopaedic Sleeve fits a defined role in this framework — the kinematic adjunct for the patient on the keep-them-out-of-theatre pathway. It is worth spelling out the mechanism, the data, and the limits with some precision, because the framing matters for which patients benefit and which patients are wasting the window.

The mechanism. The University of Queensland Final Report (June 2025) measured a reduction in peak plantarflexion angle of approximately two degrees during walking with the Sleeve worn. Translated into clinical terms, that is a small but repeatable shift in where the talus ends up at the top of push-off — the position that drives the anteromedial contact lesion. Modelled at the joint, the two-degree reduction corresponds to roughly a ten percent decrease in end-range tibiotalar compression at the contact zone with every footfall. Multiply that by the ambulatory load of a typical day and the cumulative offload is non-trivial. This is the kind of mechanical adjunct that makes conservative management mathematically possible — you are reducing the dose at the impingement zone with every step, not asking the patient to think about their ankle.

The EMG signature is the second half of the story. The same UQ work showed a group-significant effect on medial gastrocnemius activation during standing balance — approximately 32 percent — alongside individual late-stance walking maxima of 47.8 percent (lateral gastrocnemius), 21.9 percent (medial gastrocnemius), and 20.4 percent (soleus). The honest reading is that the 32 percent figure is the group-level standing-balance effect and the late-stance walking numbers are individual maxima rather than mean walking effects. The pattern across both metrics, however, points the same direction — a nudge toward the calf activation profile that the Sue Mayes-style calf-endurance programme is trying to build. The Sleeve does not replace that programme. It complements it.

The case for inclusion. For the soft tissue impingement patient and the mild bony presentation (van Dijk Grade 0 or low Grade I) during an active conservative trial, the Sleeve is a defensible kinematic adjunct alongside physiotherapy mobilisation, soleus-biased loading, and load modulation. The clinical edge is in the cumulative dose reduction — the per-step offload is small, the per-day offload is meaningful, and the per-week offload across an eight to sixteen week programme is the kind of intervention that shifts the curve.

The limits. The Sleeve is not a treatment for an established bony block requiring arthroscopic debridement. The patient with a hard end-feel, a 5 mm-plus spur, and joint space narrowing is in the surgical conversation and the kinematic adjunct cannot change that. The honest framing with the patient is that the Sleeve reduces the per-cycle dose of end-range loading rather than altering the joint — and the right time to use it is during the conservative window before that conversation closes.

The conservative pathway in anterior ankle impingement is not a holding pattern before surgery. For the soft tissue subtype it is the treatment. For the bony subtype it is the preparation. The clinician’s task is to know which one is in front of them — and to use the tools, including the kinematic adjuncts, that make the conservative trial a real one rather than a wait.

Key references

1. Tol JL, Slim E, van Soest AJ, van Dijk CN. The relationship of the kicking action in soccer and anterior ankle impingement syndrome. Am J Sports Med. 2002;30(1):45–50.
2. Tol JL, Verhagen RA, Krips R, Maas M, Wessel R, Dijkgraaf MGW, van Dijk CN. The anterior ankle impingement syndrome: diagnostic value of oblique radiographs. Foot Ankle Int. 2004;25(2):63–68.
3. Tol JL, Verheyen CPPM, van Dijk CN. Arthroscopic treatment of anterior impingement in the ankle: a prospective study with a five- to eight-year follow-up. J Bone Joint Surg Br. 2001;83(1):9–13.
4. van Dijk CN. Anterior and posterior ankle impingement. Foot Ankle Clin. 2006;11(3):663–683.
5. Baillie P, Ferrar K, Cook J, Smith P, Lam J, Mayes S. Posterior ankle impingement syndrome clinical features are not associated with imaging findings in elite ballet dancers and athletes. Clin J Sport Med. 2022.
6. Mayes S, et al. Musculoskeletal injury in an Australian professional ballet company, 2018–2021: 953 medical-attention and 706 time-loss injuries over 4 years. J Dance Med Sci. 2023.
7. Pickering M. “Quade Cooper undergoes minor surgery.” RugbyJP, 8 August 2024. https://www.rugbyjp.com/post/quade-cooper-undergoes-minor-surgery
8. “Roosters star Luke Keary in doubt for round one.” ESPN, 2022. https://www.espn.com/espn/print?id=33324765
9. University of Queensland. Orthopaedic Sleeve Final Report — kinematic and EMG analysis. June 2025.