Midfoot arthritis develops when cartilage wears down in the small joints across the middle of your foot, most often from a combination of prior injury, gradual degeneration, and the shape of your foot itself. About 12% of adults over 50 have symptomatic midfoot osteoarthritis, making it more common than many people realize. The joints most frequently affected are the second and third tarsometatarsal joints, where the long bones of your foot connect to the small, tightly packed bones in the arch.
The Five Main Causes
Midfoot arthritis generally falls into one of five categories: degenerative (wear and tear), post-traumatic (following an injury), inflammatory (from a systemic condition like rheumatoid arthritis), neuropathic (related to nerve damage), and secondary to a previous surgical fusion of the ankle or hindfoot. Most cases are either degenerative or post-traumatic, though the line between those two is blurry. Many people diagnosed with “primary” degenerative arthritis can recall an old injury that was never properly treated or was dismissed at the time.
Prior Injury and Lisfranc Damage
Post-traumatic arthritis is one of the most common causes of midfoot joint breakdown. The Lisfranc joint complex, a group of bones and ligaments running across the middle of the foot, is particularly vulnerable. Lisfranc injuries range from obvious fractures to subtle ligament tears that are easy to miss on initial X-rays. Up to 50% of people who sustain a Lisfranc injury go on to develop post-traumatic arthritis in those joints, and the risk rises with the severity of cartilage damage at the time of injury.
These injuries often happen during falls, car accidents, or sports where the foot is planted and twisted. Because mild Lisfranc sprains can look like a simple sprain, they’re frequently undertreated. The ligament instability left behind allows the joint surfaces to grind unevenly over months and years, accelerating cartilage loss.
Degenerative Wear and Tear
Like osteoarthritis in the knee or hip, the midfoot joints can simply wear down over time. The second tarsometatarsal joint is the most commonly affected, showing arthritic changes on X-ray in roughly 84% of cases studied, followed closely by the third tarsometatarsal joint at about 72%. These two joints sit at the apex of your arch and bear significant compressive force with every step, which helps explain why they break down first.
Prevalence increases with age, though not as dramatically as you might expect. Around 11.8% of people aged 50 to 64 have symptomatic midfoot osteoarthritis, and that number rises to about 14.4% in those 75 and older. Women are affected more often than men at every age, with the gap widening after 75: roughly 16.6% of women in that age group have symptomatic midfoot arthritis, compared to 11.3% of men.
Flat Feet and Foot Structure
The shape of your foot plays a meaningful role. People with midfoot osteoarthritis consistently have flatter foot posture compared to those without the condition. Specifically, they tend to have a lower arch (measured by a decreased calcaneal inclination angle) and greater alignment changes between the heel bone and first metatarsal.
A flatter arch causes the foot to pronate, or roll inward, more than normal. This shifts extra compressive force onto the top of the midfoot joints, particularly the second tarsometatarsal joint. That joint is especially vulnerable because the base of the second metatarsal bone sits wedged tightly between three surrounding bones and has very little room to move. When the arch flattens, the resulting dorsal compression on that joint accelerates cartilage wear. Cadaver studies confirm this: when the ligaments supporting the arch are cut to simulate a flat foot, compression across the top of the midfoot joints increases significantly.
This finding also has a practical flip side. If a pronated foot posture contributes to the problem, supportive footwear and custom orthoses that stabilize the arch may help slow progression.
Body Weight and Joint Loading
Higher body weight directly increases the pressure your midfoot absorbs during walking. Research comparing obese adults (average BMI around 36.5) with non-obese adults (average BMI around 24) found that the heavier group experienced notably greater midfoot peak pressure and maximum force with each step. In one study, BMI alone accounted for about 30% of the variance in midfoot joint positioning during walking, a substantial contribution from a single factor.
The mechanism is straightforward: more weight pressing down on the arch during every step can gradually collapse the longitudinal arch, which in turn elevates pressure on those midfoot joints. Over years, this compounds the kind of cartilage damage that leads to osteoarthritis.
Inflammatory and Systemic Conditions
Rheumatoid arthritis and other inflammatory joint diseases can target the midfoot, though they affect it less frequently than other parts of the foot. In rheumatoid arthritis specifically, the forefoot is involved in about 59% of cases and the hindfoot in 27%, while the midfoot accounts for roughly 14%. Some earlier studies place midfoot involvement even lower, around 7%.
When inflammatory arthritis does reach the midfoot, it typically affects multiple joints at once rather than a single one. The damage comes from the immune system attacking the joint lining rather than from mechanical wear, so it can progress even in people who aren’t particularly active or heavy. Gout can also cause midfoot inflammation, though the classic presentation targets the big toe joint first.
Neuropathic Arthritis (Charcot Joint)
People with significant nerve damage in their feet, most often from diabetes, can develop a destructive form of arthritis called Charcot neuroarthropathy. When you can’t feel pain properly, you don’t adjust your gait to protect damaged joints. Repeated, undetected micro-injuries cause the bones and joints to break down, sometimes dramatically. The midfoot is one of the most common sites for Charcot changes, and the condition tends to affect multiple joints simultaneously. Without intact sensation acting as a warning system, the damage can become severe before it’s even noticed.
Previous Ankle or Hindfoot Surgery
Surgical fusion of the ankle or hindfoot joints eliminates motion at those levels but doesn’t eliminate the forces your foot has to absorb. Instead, those forces get transferred to the joints that still move, and the midfoot is a prime recipient. This means people who’ve had a successful ankle or hindfoot fusion can develop midfoot arthritis years later as a secondary consequence, simply because those small joints are now handling stresses they weren’t designed to bear alone.
How These Causes Change Your Gait
Regardless of the initial cause, midfoot arthritis alters the way you walk, which can create a cycle of worsening joint stress. People with midfoot osteoarthritis tend to show greater subtalar pronation (inward rolling at the ankle joint) during the late phase of each step. Their tarsometatarsal joints compensate by supinating (rolling outward) to keep the foot flat on the ground. This pattern, described by biomechanists as the “twisted plate” mechanism, means the midfoot is constantly working harder to maintain stability, placing additional strain on already damaged cartilage.
These gait changes also help explain why midfoot arthritis tends to be progressive. The compensatory mechanics that develop to work around painful joints end up loading those same joints in abnormal ways, which drives further cartilage breakdown over time.