Don’t mistake Chopart joint arthritis (transverse tarsal joint OA) for sequelae of a sprain or ankle osteoarthritis — Dr. Moriwaki on chronic degeneration of the talonavicular and calcaneocuboid joints, and what stem cell conditioned media peri-articular injection can and cannot address2026.08.14
“It aches deep in the middle of the foot — not the ankle, not the base of the toes.” “The first few steps after standing up hurt, slightly outside the arch.” This kind of midfoot pain is often dismissed as “the sequelae of a sprain” or “ankle osteoarthritis,” but Chopart joint arthritis (transverse tarsal joint arthritis) may be hiding behind it. This is a chronic degenerative arthritis crossing two joints — the talonavicular joint (between the talus and the navicular) and the calcaneocuboid joint (between the calcaneus and the cuboid). Before considering stem cell conditioned media peri-articular injection as an option, it is essential to first medically organize the pathology, the differential diagnosis, and the boundary between “what can be targeted” and “what cannot.”
Key Points of This Article
・Chopart joint arthritis is a chronic degeneration spanning the talonavicular and calcaneocuboid joints (the transverse tarsal joint), presenting as a heavy, weight-bearing pain in the middle of the dorsum of the foot.
・It often has chronic post-sprain sequelae or adult-onset flatfoot in its background, with a pathology distinct from tibiotalar osteoarthritis or posterior tibial tendon dysfunction.
・What peri-articular injection of stem cell conditioned media can address is the correction of the chronic intra-articular inflammatory environment — it does not reverse osteophytes or joint space narrowing themselves.
・Diagnosis requires combining weight-bearing X-rays, MRI, and palpation; red flags must be excluded before designing a combined plan with orthoses and exercise therapy.
Where Exactly Is the Chopart Joint?
Anatomy and role of the transverse tarsal joint
The Chopart joint refers collectively to two joints — the talonavicular joint (between talus and navicular) and the calcaneocuboid joint (between calcaneus and cuboid) — that form a transverse “joint line” across the middle of the foot; in Japanese it is also called the transverse tarsal joint. It functions like a “turntable” of the foot, absorbing the twisting motion (pronation and supination) during gait, acting as a hinge that functionally connects the hindfoot and midfoot. Because it sits distal to the tibiotalar joint (what people usually call “the ankle”), it is not uncommon for patients to point to “just below the ankle bone,” “the outside of the arch,” or “the middle of the dorsum,” which corresponds precisely to this joint line.
Why Chopart joint arthritis is easily overlooked
This form of arthritis is far less famous than tibiotalar osteoarthritis, and because it does not present as restriction of ankle dorsiflexion or plantarflexion, patients often give the vague complaint that “the ankle still moves fine but the middle of the foot hurts when I walk.” On plain X-rays, joint space narrowing and osteophyte formation are hard to read without oblique or weight-bearing views, so at first visit the patient may be told “no abnormality on X-ray” and go unnoticed for years.
Differentiation from Post-Sprain Sequelae and Tibiotalar Osteoarthritis
Differences from chronic lateral ankle sprain sequelae
Well-known chronic sequelae of a lateral ankle sprain include chronic pain in the anteroinferior aspect of the lateral malleolus from anterior talofibular / calcaneofibular ligament injury, osteochondral lesions of the talus, and peroneal tendinopathy. However, at the moment of the sprain, twisting of the talus–navicular relationship also stresses the Chopart joint, which may manifest years to decades later as secondary degeneration. If the center of the pain seems to have migrated from “the original site of the sprain” toward “the middle of the foot,” a viewpoint that suspects this joint becomes necessary.
Differences from tibiotalar osteoarthritis
Tibiotalar osteoarthritis presents as restriction of dorsiflexion and plantarflexion of the ankle and narrowing of the tibia–talus joint space, with pain concentrated in the ankle itself (around the medial and lateral malleoli). In contrast, Chopart joint arthritis preserves ankle range of motion itself, but the joint spaces between the talar head and navicular, and between the anterior calcaneus and cuboid, become narrow, and pain is induced by vertical and rotational stresses on the midfoot during weight bearing. For information on joint conditions, general educational materials from the Japanese Orthopaedic Association are also a useful reference.
Relationship with posterior tibial tendon dysfunction (adult-acquired flatfoot)
When the posterior tibial tendon, which supports the medial longitudinal arch, chronically elongates into dysfunction, the talar head drops medially and inferiorly, placing sustained stress on the talonavicular joint. Therefore, in patients whose flatfoot suddenly progressed in adulthood, one must always keep in mind that degeneration of the transverse tarsal joint may be advancing secondarily.
What Stem Cell Conditioned Media Peri-Articular Injection Can Do for Chopart Joint Arthritis
What can be targeted — correcting the chronic intra-articular inflammatory environment
One source of pain in Chopart joint arthritis is the ongoing synovitis that accompanies joint space narrowing and cartilage degeneration. Stem cell conditioned media is a cocktail of secreted factors — growth factors, cytokines, exosomes and more — and it is an approach that, via anti-inflammatory signals, aims to calm the synovial inflammatory cycle. The option of local injection of stem cell conditioned media around the talonavicular and calcaneocuboid joints is designed with this correction of the intra-articular inflammatory environment in mind. However, this remains an out-of-pocket treatment outside insurance coverage; effects vary between individuals, and it still sits at the level of case reports and observational studies within the evidence hierarchy — this must be shared honestly with patients.
What cannot be targeted — bony deformity and joint space narrowing themselves
On the other hand, peri-articular injection of stem cell conditioned media does not reverse osteophytes that have already formed or advanced joint space narrowing itself. In cases where deformity has advanced significantly, procedures such as talonavicular arthrodesis or double arthrodesis may be considered, and drawing the line between “stages where conservative management can still hold” and “stages where surgery should be considered” is indispensable in conjunction with orthopedic imaging evaluation. Please also see more about our stem cell conditioned media joint injection.
Combined design with orthoses, footwear, and rehabilitation
Conservative management is not completed by peri-articular injection alone; it should be designed together with interventions that “reduce the mechanical stress on the joint” — insoles with arch support that hold up the medial longitudinal arch, strengthening of the posterior tibial, peroneal, and intrinsic foot muscles, and weight management. The perspective of not ending with “injection alone” is indispensable when coping with this chronic pain over the long term.
Frequently Asked Questions
Q. Will Chopart joint arthritis heal on its own?
Structural changes such as joint space narrowing and osteophytes do not spontaneously revert. However, since the source of pain is often the intra-articular chronic inflammation, a combination of conservative therapies — orthoses, exercise therapy, weight management, and stem cell conditioned media peri-articular injection — may allow pain and function to be maintained for a long time.
Q. Over how many sessions is the effect of stem cell conditioned media peri-articular injection assessed?
Efficacy is evaluated over several months of multiple induction-phase administrations, objectively assessed by pain scores and range of motion during weight-bearing gait. This is not a treatment where everything is decided in a single session; from the outset, it is important to share the decision framework of continue / change / re-evaluate orthopedically if the response is poor.
Q. How does it differ from a steroid injection?
Steroid joint injections have a strong anti-inflammatory effect and calm pain in the short term, but repeated administration raises concern regarding effects on cartilage and surrounding soft tissue. Stem cell conditioned media is a different axis of action that aims to “regulate the inflammatory environment,” and it is positioned as an option with different goals and time frames.
Q. I was told surgery is my only option — can I still hold on conservatively?
If joint space narrowing is severe and daily life is significantly impaired, arthrodesis may be considered. However, imaging findings do not always align with pain intensity or functional impairment, so it is worth reassessing the room for conservative management — including a second opinion.
Q. Can I resume running or hiking?
It depends on the success of inflammatory control and the state of the joint. Returning abruptly to activities involving rotation and repeated impact just because the pain has eased often leads to flare-ups; as a rule, gradual return should be phased in through intermediate loading stages in rehabilitation.
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Medical Supervision: Shin Moriwaki, MD
Member of the Japan Society of Aesthetic Surgery (JSAS) / Member of the American Academy of Aesthetic Medicine
ECFMG Certificate
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