title: Unilateral fusion of the scaphoid and the trapezium.
abstract: Fusion of the carpal bones is a rare anatomical abnormality, caused by a defect in the separation and cavitation during embryonic development. It has a prevalence of about 0.1% and most of the time, patients do not present with symptoms. Symptoms are usually caused by wear and tear of the ligaments attached to the fused carpal fragments. We present a case in which a woman aged 36 years experiences pain caused by a lunato-triquetral instability which in turn is caused by a unilateral complete fusion of the scaphoid and the trapezium. A unilateral complete fusion of the scaphoid and trapezium has not been reported before.
authors: Department of Neuroscience and Anatomy, Erasmus MC, Rotterdam, Zuid-Holland, The Netherlands.|Department of Orthopaedic Surgery, Reinier de Graaf Hospital, Delft, The Netherlands.
authors: Alexander Robert
authors: http://orcid.org/0000-0001-8326-4869
authors: AR
authors: Poublon
authors: Department of Orthopaedic Surgery, Reinier de Graaf Hospital, Delft, The Netherlands.
authors: Gerald
authors: G
authors: Kraan
authors: Department of Neuroscience and Anatomy, Erasmus MC, Rotterdam, Zuid-Holland, The Netherlands.
authors: Gert-Jan
authors: GJ
authors: Kleinrensink
mesh_terms: D000328:Adult; D018771:Arthralgia / Q000209:etiology*; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000209:etiology; D021361:Scaphoid Bone / Q000002:abnormalities* / Q000000981:diagnostic imaging; D051222:Trapezium Bone / Q000002:abnormalities* / Q000000981:diagnostic imaging; D014955:Wrist Joint / Q000002:abnormalities*