Sesamoiditis

Sesamoid bones of the foot

Sesamoiditis is an inflammation of the small accessory bones located on the underside of the foot near the big toe. Most bones in the body are connected to each other at joints. But the sesamoid bones are connected to tendons or embedded in muscle. The kneecap (patella) is the largest sesamoid. The foot has two very small sesamoids on the underside of the front of the foot near the big toe.

Inflammation of the sesamoids in the foot may be caused by excessive impact exercise, such as running, and also by jumping sports, such as basketball and volleyball. Signs and symptoms of sesamoiditis may include:

bulletPain near the big toe, which develops gradually
bulletSwelling
bulletDiscomfort in bending and straightening the big toe

A doctor may make a diagnosis based on:

bulletPhysical examination
bulletX-rays
bulletBone scan

Treatment includes:

bulletStopping the activity that's causing the pain and switching to low-impact cross-training
bulletIcing the area under the big toe to relieve pain
bulletWearing arch supports or metatarsal pads to take pressure off the sesamoid bones

 

By Mayo Clinic Staff