Most ankle arthritis starts with an old fracture

Unlike hip or knee arthritis, which develop gradually through decades of wear, ankle arthritis is overwhelmingly the product of a specific injury. Between 75 and 80% of ankle osteoarthritis cases are post-traumatic in origin — tracing back to a fracture, a ligament rupture, or recurrent instability rather than simple ageing.

Intra-articular fractures carry the highest conversion risk. When a break disrupts the cartilage surface and the subchondral bone beneath it, the joint faces a compounding problem: structural damage at the moment of injury, altered load distribution as the bone heals, and a sustained inflammatory environment that continues to degrade cartilage long after the fracture itself has united. Even lower-energy rotational ankle fractures — the kind that might seem straightforward to manage — can set this process in motion, particularly when residual ligamentous laxity leaves the joint mechanically unstable.

The clinical puzzle is timing. Symptoms commonly emerge years or even decades after the original injury, often in a patient's thirties or forties who no longer thinks of themselves as someone with an ankle injury. That gap is not wasted time — it represents a window in which the trajectory of joint deterioration may still be altered. The question this article addresses is whether that window can be used effectively.

Why the biology of early post-fracture OA is different from end-stage disease

Something happens inside the ankle joint within the first two weeks of a fracture that imaging cannot yet capture. A 2025 RNA-sequencing study found measurably distinct molecular signatures in the synovium — the joint lining — collected within 14 days of injury, well before cartilage loss is visible on any scan. The joint has already entered a different biological state; a process of deterioration is under way before the fracture has finished healing.

This matters for two reasons. First, surgical fixation of the broken bone — while essential — does not resolve that process. Repairing an intra-articular fracture triggers its own secondary response, driven by what researchers describe as the body's inflammatory stress chemistry inside the joint cell (the mitochondrial reactive-oxygen-species pathway). Correcting the fracture and protecting the joint from long-term biological harm are separate problems requiring separate attention.

Second, ankle cartilage is unusually sensitive to biomechanical disruption. Even small degrees of residual malalignment or instability after a fracture alter the loading pattern across a surface measured in millimetres — and the cartilage, though it has some capacity for self-restoration when loading is normalised, cannot compensate for sustained mechanical aberrancy.

Early and end-stage post-traumatic OA differ markedly at the molecular level. The same treatments do not work equally at both stages — and that is precisely why earlier assessment opens more therapeutic options than waiting for pain to become severe.

Conservative approaches that may do more than manage symptoms

Conservative care, in this context, means something more purposeful than waiting with pain relief. The central logic is mechanical: an ankle that remains unstable after a fracture subjects the cartilage to repetitive micro-trauma with every step, regardless of how well the bone itself has healed. Addressing that instability — rather than simply dampening the pain it produces — is increasingly framed by specialists as targeting the structural driver of OA progression, not merely managing symptoms.

Ligament repair for residual post-fracture laxity sits at one end of this spectrum. Where sufficient instability persists to alter joint mechanics, restoring ligamentous integrity may interrupt the cycle of cartilage damage more effectively than rehabilitation alone. Custom carbon-fibre bracing represents the conservative counterpart: stiffer and more precisely fitted than standard off-the-shelf ankle supports, it is specifically highlighted in a 2024 Journal of Orthopaedic Research review as a strategy with potential to prevent instability-driven OA development — not simply to reduce discomfort.

Physiotherapy-led neuromuscular control work, proprioceptive retraining, and gait analysis address the same biomechanical problem through load management and motor reprogramming. Emerging assessment tools — weight-bearing CT and biplane fluoroscopy — may sharpen the identification of which residual malalignments are most OA-permissive, enabling more precisely targeted conservative programmes rather than generic advice.

The supporting evidence is mechanistic and observational rather than trial-proven; the structural benefit of these measures has not yet been confirmed in randomised studies. For patients with significant malalignment rather than subtle instability, that limitation becomes clinically relevant — and is where surgical joint-preservation options enter the picture.

Joint-preservation surgery — the middle ground before fusion or replacement

For patients with demonstrable malalignment after a malunited fracture and moderate — but not end-stage — OA, a tier of surgical options exists between conservative management and joint replacement.

Supramalleolar osteotomy (SMO) reshapes the lower shin bone to redistribute load more evenly across the ankle surface. Where a fracture has healed in a slightly off-angle position, the joint bears weight asymmetrically, accelerating cartilage loss on the overloaded side. Two 2025 retrospective series examined SMO specifically for post-fracture ankle arthritis: AOFAS functional scores rose to approximately 82 and VAS pain scores fell to around 3, with no measurable Takakura staging progression at mean follow-ups of roughly 22–47 months. When residual talar tilt complicates the deformity — a three-dimensional problem that tibial correction alone cannot resolve — adding a calcaneal osteotomy addresses the hindfoot component, bringing the heel into proper alignment with the corrected ankle.

Ankle joint distraction arthroplasty works by a different mechanism: an external frame holds the joint under controlled unloading for several weeks, reducing compressive stress and creating conditions in which some cartilage recovery may occur. In a published series of 16 patients followed for a mean of 40.9 months, 14 retained their native joint and AOFAS scores improved from 41.9 to 68.1 — though meaningful benefit was demonstrated in approximately 56% of patients, not all.

Patient selection is the governing variable: age, activity level, degree of malalignment, and OA stage all determine whether any of these procedures is appropriate. The evidence base remains retrospective with medium-term follow-up only; no randomised controlled trials have confirmed long-term structural protection, and specialist assessment is essential before drawing any conclusions about individual suitability.

Injections and biologics as part of joint preservation

Injection therapies sit alongside the mechanical and surgical strategies covered above — addressing symptoms and, in some cases, supporting the joint's biological environment, but not substituting for correction of malalignment or instability.

Hyaluronic acid (HA) is the most established option in this tier. Viscosupplementation — injecting a lubricating gel into the ankle joint — reduces pain and improves function in a meaningful proportion of patients, and HA is also used as a peri-operative adjunct to some surgical procedures. It has not been shown to alter the structural course of OA or slow radiographic progression.

Cell-based therapies — including bone marrow aspirate concentrate (BMAC), adipose-derived stem cells, and related preparations — are increasingly proposed as joint-preserving biologics. A 2026 scoping review examined 11 clinical studies in this area and found that 9 of the 11 co-administered the cell preparation alongside a surgical procedure rather than as a standalone injection. With the cell effect confounded by concurrent surgery in the large majority of studies, standalone injection efficacy cannot currently be attributed to the cells themselves.

ChondroFiller injection takes a distinct approach: rather than delivering cells, it places an acellular collagen scaffold into the defect via ultrasound-guided outpatient injection. The scaffold gels in place and recruits the patient's own progenitor cells from surrounding tissue — a process termed matrix-induced chondrogenesis. In the ankle, this approach is most relevant at the focal cartilage defect stage, typically an osteochondral lesion of the talus, rather than in diffuse end-stage OA.

No injection has yet been shown in clinical trials to halt radiographic OA progression in the ankle. These options are best understood as one layer of a multi-modal approach, working in conjunction with the structural and mechanical strategies outlined above.

When to get an ankle assessment in London

Persistent ankle pain or stiffness following a fracture — even years or decades after the original injury — is a reasonable prompt for specialist review rather than continued GP management alone. The gap between injury and symptoms is one of the defining features of post-traumatic ankle OA, and that gap is also the window in which the most options remain open.

A specialist assessment typically combines a detailed history of the original fracture mechanism, current symptom pattern, and functional limitations with physical examination of alignment and stability, followed by weight-bearing imaging to stage any OA and identify residual malalignment. Weight-bearing X-rays or CT rather than standard resting scans are important here: joint loading conditions reveal angular and rotational problems that disappear when the foot is off the ground.

The practical implication is timing. Earlier assessment leaves room for conservative stabilisation, biological support, or a joint-preservation procedure; a later presentation — once cartilage loss is diffuse and alignment is substantially compromised — narrows the realistic choices toward fusion or replacement.

For patients in whom imaging reveals a focal cartilage defect of the talus at an appropriate stage, a ChondroFiller injection — the ultrasound-guided, outpatient collagen-scaffold pathway — may be relevant. Liquid Cartilage™ is delivered in the UK at the London Cartilage Clinic on Harley Street, the UK certified delivery centre; patient selection and technique are the critical variables in whether an injectable scaffold achieves its intended effect, which is why Professor Paul Y. F. Lee's involvement in individual case decisions matters. Book an assessment via londoncartilage.com.

1. [1] Ankle Osteoarthritis (JAAOS review). (2024). https://doi.org/10.5435/JAAOS-D-23-00743 https://doi.org/10.5435/JAAOS-D-23-00743
2. [2] Ankle osteoarthritis: Toward new understanding and opportunities for prevention and intervention. (2024). https://doi.org/10.1002/jor.25973 https://doi.org/10.1002/jor.25973
3. [3] Prevalence and risk factors of ankle osteoarthritis in a population-based study. (2024). https://doi.org/10.1016/j.fas.2024.02.009 https://doi.org/10.1016/j.fas.2024.02.009
4. [4] Mechanistic Parallels Between Early Post-Fracture and Post-Traumatic Ankle Osteoarthritis: Identifying Synovial Targets for Prevention and Treatment. (2025). https://doi.org/10.1177/2473011425s00323 https://doi.org/10.1177/2473011425s00323
5. [5] Supramalleolar osteotomy outcomes for post-traumatic fracture-related ankle arthritis: a retrospective analysis. (2025). https://doi.org/10.1186/s12893-025-03087-1 https://doi.org/10.1186/s12893-025-03087-1
6. [6] Brain regulates weight bearing bone through PGE2 skeletal interoception: implication of ankle osteoarthritis and pain. (2024). https://doi.org/10.1038/s41413-024-00316-w https://doi.org/10.1038/s41413-024-00316-w
7. [7] Supramalleolar osteotomy combined with calcaneal osteotomy for varus ankle arthritis with excessive talar tilt angle. (2025). https://doi.org/10.1302/2633-1462.611.BJO-2025-0171.R1 https://doi.org/10.1302/2633-1462.611.BJO-2025-0171.R1
8. [8] Ankle joint distraction arthroplasty for severe ankle arthritis. (2017). https://doi.org/10.1186/s12891-017-1457-9 https://doi.org/10.1186/s12891-017-1457-9
9. [9] Cell-Based Therapies for Post-Traumatic Ankle Osteoarthritis and Osteochondral Lesions of the Talus: A Systematic Scoping Review. (2026). https://doi.org/10.3390/bioengineering13070843 https://doi.org/10.3390/bioengineering13070843