Sesamoiditis is a common ailment of the plantar forefoot, causing pain in the ball of the foot specifically under the big toe joint. The sesamoid bones are very small bones which are located under the big toe joint within the tendons that run to the big toe. They are similar to the knee cap, acting to increase the leverage of the tendons that control the big toe. The sesamoid bones take an incredible amount of pressure, stress, and force with every step one takes. This puts these bones at risk for developing injury and inflammation as a response to these forces.
People participating in activities and sports that involve repetitive, excessive loading of the ball of the foot such as dancing, sprinting or even walking often suffer from this condition. People with bony, higher arched feet, marked flat feet or those who tend to run on the ball of their foot also tend to be more prone to sesamoiditis.
The pain may be constant, or it may occur with or be aggravated by, movement of the big toe joint. It may be accompanied by swelling throughout the bottom of the forefoot.
Damage to the sesamoid bone may also result in sesamoiditis. Stress fractures (fine cracks in the bone structure due to repetitive abuse) can occur if the condition is untreated, and in more severe cases can turn into a true bone fracture.
Treatment for Sesamoiditis
Treatment is usually non-invasive. The Podiatrist may suggest one or more of the following:
- Immediate Immobilisation of the joint
- I.C.E Rest / Ice / Compression / Elevation
- Use of modified shoes that have reduced flexion at the forefoot or orthotic therapy
- Anti-inflammatory medication
- Temporary Padding and Strapping: Temporary padding and strapping can reduce sesamoid discomfort up to 80% in the first 48 hours, which is a significant result if you’ve been in pain for some time.
Severe cases may require a below-the-knee walking cast for 2 to 4 weeks and the injection of steroids. Often foot orthoses are used to correct any anatomical or functional foot issues that have contributed to the problem, in order to prevent a recurrence.
Long-term therapy must be geared to identifying the cause of the sesamoiditis so as to avoid these situations or to accommodate foot deformities or modify shoes. This may include the use of orthotic devices.
When chronic pain is unable to be managed by these conservative methods, or if avascular necrosis has occurred, a surgical procedure called a ‘sesamoidectomy’ may be indicated. This is removal of all or part of the painful sesamoid bone.