pediatrics
Köhler Bone Disease
Introduction
Köhler bone disease is Overview of Osteochondroses of the tarsal navicular bone. Osteochondroses are noninflammatory, noninfectious derangements of bony growth at various ossification centers. Köhler bone disease usually affects children aged 3 to 5 years (more commonly boys) and is unilateral. The foot becomes swollen and painful; tenderness is maximal over the medial longitudinal arch. Weight bearing and walking increase discomfort, and gait is disturbed. On x-ray, the navicular bone is initially flattened and sclerotic and later becomes fragmented, before reossification. X-rays comparing the affected side with the unaffected side help assess progression. 