Flat Foot Secondary To Os

What exactly is a “ganglion”?

Flat foot secondary to Os-Naviculare

This condition presents as a painful lump on the inner side of the ankle and is often associated with flat feet. Children typically report pain that worsens with activity. It is usually seen in both feet, although one side is often more symptomatic than the other.

Do all children need surgery?

Not all children require surgery. Surgery is only recommended if non-operative treatments, such as physiotherapy, stretching, and insoles, have not been successful in relieving symptoms.

Non-operative treatment options include:

• Use of insoles to support the arches and improve foot alignment
• Physiotherapy to stretch the calf and hamstring muscles
• Modification of activities that worsen symptoms
• Serial casting, which may be considered if calf muscle tightness persists despite a structured course of physiotherapy.

Operative treatment:

Operative treatment is indicated if the flat foot continues to progress, with persistent pain on the inner side of the ankle that does not improve despite the above non-operative measures.

Operative treatment is usually performed as a day-case procedure. It involves excising the extra bone and reattaching the tendon to the navicular bone. In addition, most children will also require correction of the flat foot, using the surgical procedure described in the flat foot section.