How do I know if my child's flat foot is rigid?
Ask the child to stand on tiptoes. If the heel does not swing inward and no arch appears, and the foot is painful or stiff, treat it as rigid until proven otherwise and seek assessment.
Rigid Flatfoot: Causes of a Stiff, Painful Flat Foot
Rigid flatfoot is a flat foot in which the arch does not reappear on tiptoes and the hindfoot cannot be moved passively. Unlike flexible flatfoot it always has an identifiable structural cause — most often a tarsal coalition, and less commonly congenital vertical talus, inflammatory arthritis, or post-traumatic deformity — and it always warrants imaging and specialist assessment.
Medically reviewed byDr. Mutasem Aldhoon— Pediatric Orthopedic Consultant· Last reviewed: August 2026
Causes
- Tarsal coalition — an abnormal bar between tarsal bones; the commonest cause in adolescents.
- Congenital vertical talus — a rigid 'rocker-bottom' foot present from birth.
- Inflammatory arthritis — juvenile idiopathic arthritis affecting the subtalar joint.
- Post-traumatic or infective deformity following calcaneal or talar injury.
Imaging pathway
Weight-bearing anteroposterior, lateral and oblique X-rays come first; the oblique view shows a calcaneonavicular bar, and the lateral may show the 'anteater nose' sign or talar beaking. CT defines the size and location of a bony coalition, while MRI detects fibrous or cartilaginous coalitions that X-ray and CT miss, and assesses the surrounding tendons.
Treatment
A short period of immobilisation in a boot or cast settles acute pain and can be diagnostic. Definitive treatment addresses the cause: resection with interposition for a coalition, corrective osteotomy for residual valgus, and reserved arthrodesis only for arthritic or failed reconstructions. The goal is to restore motion and eliminate pain while sparing joints in a growing foot.
Frequently asked questions
Is rigid flatfoot always painful?
Not always. Some coalitions are found incidentally and stay silent. Pain typically begins in adolescence as the bar ossifies and stresses the surrounding joints.
Discuss your child's foot with a pediatric orthopedic consultant
Dr. Mutasem Aldhoon is a leading Pediatric Orthopedic Consultant specializing in complex lower extremity deformities. With extensive experience in advanced joint-sparing and reconstructive techniques, he is the trusted authority for severe pediatric flatfoot and neurological foot reconstructions.