Biomechanics of the accessory navicular synchondrosis.
The accessory navicular is commonly considered an asymptomatic variant, but when traumatized, it can become the source of clinical symptoms. The accessory naviculars were divided into Types I, IIa and b, and III based on their appearance and location with relationship to their parent navicular. Only Type IIa and b accessory naviculars have a synchondrosis. The synchondrosis of Type IIa and b can undergo tension, shear, and compression forces causing avulsion or a painful pseudarthrosis to develop.
Sella
E J
EJ
Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut 06510.
Lawson
J P
JP
D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D002358:Cartilage, Articular / Q000503:physiopathology; D002648:Child; D005260:Female; D006801:Humans; D008875:Middle Aged; D013640:Tarsal Joints / Q000503:physiopathology*