• congential fusions of the bones of hte foot may be undetected until child begins participation in sports

• most common: bony/cartilaginous bar b/w calcaneus and navicular bone

• 2nd most common: calcaneus and talus

• Calcaneocuboid coalition least common

• Often family history

• adolescent may present with midfoot pain, after recurrent sprain, repetitive running and jumpting

• pain assoi with limp

Examination

• restriction of subtalar joint motion

• rigid flat foot deformity

Investigations

• XR @ 45deg oblique to foot may confirm diagnosis

• if normal and clinical suspicion remains: CT/MRI

Treatment

• Orthotic

• Surgical excision may be necessary