Capsulitis (Forefoot Joint Inflammation)

What is Capsulitis?

Capsulitis is an inflammation of the joint capsule, most commonly affecting the joint at the base of the second toe (2nd metatarsophalangeal joint).

This condition develops when the joint is overloaded or unstable, leading to irritation of the surrounding soft tissues.

Aetiology (Causes)

Capsulitis is usually related to mechanical overload and joint instability, often associated with:

• Excessive pressure on the ball of the foot

• Long second toe (Morton’s toe pattern)

• Tight Achilles tendon and plantar fascia

• Muscle imbalance around the forefoot

• Poor foot mechanics (e.g., overpronation)

• Inappropriate footwear

From a biomechanical perspective, increased forefoot loading shifts pressure to the second toe joint, leading to inflammation.

Symptoms

Patients commonly present with:

• Pain under the ball of the foot (especially under the 2nd toe)

• Feeling like “walking on a stone”

• Swelling around the joint

• Pain when barefoot or during push-off

• Tenderness when pressing the area

Progressive Signs

If not managed early, capsulitis may lead to:

• Toe drifting or deviation

• Weakening of joint stability

• Development of hammer toe or crossover toe deformity

Why symptoms occur

• Repetitive stress on the joint capsule

• Loss of normal joint alignment

• Compensation due to tight calf and plantar fascia

This creates a cycle of:
➡️ overload → inflammation → instability → deformity

Key Takeaway

• Capsulitis is an early warning sign of forefoot overload

• Symptoms are mechanical and progressive if untreated

• Early intervention can prevent long-term deformity