Navicular Stress Fractures: A Narrative Review of Pathoanatomy, Diagnostic Pitfalls, and Management.

Navicular stress fractures are high-risk overuse injuries of the midfoot that most commonly affect athletes, military recruits, and individuals involved in repetitive weight-bearing activities, with an incidence ranging from 0.7% to 35% in different studies. Although uncommon in the general population, they pose significant diagnostic and therapeutic challenges due to their tendency for delayed union, nonunion, and chronic pain. The unique anatomy of the tarsal navicular, functioning as the keystone of the medial longitudinal arch, exposes it to considerable mechanical stress, while its central watershed zone predisposes it to relative avascularity and impaired healing. Patients typically present with vague, activity-related midfoot pain and focal tenderness over the dorsal proximal navicular, often leading to prolonged diagnostic delays. Plain radiographs frequently appear normal in the early stages, necessitating the use of advanced imaging such as computed tomography and magnetic resonance imaging for accurate detection and classification. Management depends on the fracture type, degree of displacement, and patient activity level. Nondisplaced fractures generally respond well to strict non-weight-bearing immobilization, while displaced or nonunited fractures often require surgical fixation to achieve predictable union and earlier return to activity. Operative management has been associated with higher success rates, lower refracture risk, and faster functional recovery in high-demand individuals. Adjunctive modalities such as bone stimulators, shockwave therapy, and biologic augmentation with bone graft or bone marrow aspirate are increasingly explored to enhance healing, though evidence remains limited. Successful rehabilitation emphasizes a gradual return to weight-bearing, correction of biomechanical risk factors, and optimization of bone health. Early recognition, appropriate imaging, and individualized management strategies remain essential to achieving favorable outcomes. Further research should focus on standardized diagnostic pathways, prospective comparative studies, and the role of biologic and imaging adjuncts in improving union rates and return-to-sport timelines.