injuries poisoning
Scaphoid (Navicular) Fractures
Key Points
Scaphoid fractures usually result from wrist hyperextension, typically during a fall on an outstretched hand. These fractures can disrupt the blood supply to the proximal scaphoid; thus, osteonecrosis is a common, sometimes disabling, complication. Take anteroposterior, lateral, and oblique x-rays; if imaging is normal or nondiagnostic but clinical findings suggest a scaphoid fracture, do MRI or immobilize with thumb spica splint and arrange for repeat x-rays in 1 week. 