Sella E J, Lawson J P
Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut 06510.
Foot Ankle. 1987 Dec;8(3):156-63. doi: 10.1177/107110078700800310.
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.
副舟骨通常被认为是一种无症状的变异，但受到创伤时，它可能成为临床症状的来源。根据副舟骨的外观、位置及其与母舟骨的关系，将其分为I型、IIa型和b型以及III型。只有IIa型和b型副舟骨有软骨结合。IIa型和b型的软骨结合可承受张力、剪切力和压缩力，导致撕脱或形成疼痛性假关节。
