What Are The Accessory Bones of the Foot

Bones of the Foot

Human foot consists of 26 bones (Calcaneus, Talus, Navicular, Cuboid, 3 cunieforms, 5 metatarsals, 14 phalanges ).  Under the big toe joint there are 2 bone called the sesamoids which play an important role in the function of the big toe joint.

There are small bones (ossicles) that form infrequently in the foot. These small bones are called accessory bones of the foot or accessory ossicles of the foot. Although accessory bones are uncommon, some are seen more common in general population.

 

Common Accessory Bones of the Foot

  • os tibiale externum
  • os trigonum
  • os peroneum
  • os vesalianum (accessory bone at the base of the 5th metatarsal bone

 

Less Common Accessory Bones of the Foot

  • os sustentaculum tali
  • os calcaneus tali
  • os calcaneus secondaris
  • os intercunieform
  • os intermetatarsumos sustentaculum tali
  • os calcaneus tali
  • os calcaneus secondaris
  • os intercunieform
  • os intermetatarsum
  • os talonavicular dorsale
  • os intermetatarsum
  • os talonavicular dorsale
  • os intermetatarsum
  • os talotibiale (anterior tibia bone)
  • Fabella (sesamoid bone found in the calf muscle (gastrocnemius) behind the knee

 

Diagnosis of Symptomatic Bone

Accessory bone may become symptomatic.  X-ray will show the presence of an accessory bone in the foot but a bone scan or a MRI may be required to diagnose a symptomatic accessory bone.

 

Treatment of Symptomatic Bones of the Foot

Many individuals with symptomatic accessory bones can be managed successfully without surgery. Usually rest, ice, anti-inflammatory medication, application of offloading pads and immobilization may be needs to manage a symptomatic accessory bone.

Operative Treatment:

If a patient truly fails conservative treatment of a symptomatic accessory bones of the foot, then surgical intervention may be warranted.

 

Image:

Accessory Bones of the Foot
Accessory Bones of the Foot