Introduction and importance Os odontoideum is a rare condition commonly associated with
atlantoaxial instability (AAI) and leading to atlantoaxial dislocation. The incidence of Os …

Purpose To clarify etiology, clinical features, and diagnostic and treatment options of
atlantoaxial dislocation (AAD) due to os odontoideum (OsO) in patients with Down's …

Os odontoideum is a rare anomaly of the second cervical vertebrae, which is a separated
ossicle from the body of the axis. This abnormality of the odontoid process can result in an …

Introduction Os odontoideum is a rare cervical lesion. This unusual condition is sometimes
associated with atlantoaxial subluxation, which is mostly anterior subluxation. Posterior …

Os odontoideum (OO) is defined as an ossicle with circumferential smooth margins and no
osseous continuity with the body of axis. While the size of the ossicle is variable, it has a …

Background: In a small percentage of children born with congenital hydrocephalus,
enlargement of the head and the presence of ventriculomegaly may halt and ultimately …

Background To investigate the effect of posterior atlantoaxial screw fixation for the treatment
of atlantoaxial dislocation in children with Down syndrome (DS). Methods Children …

Object The aim of this study was to audit the treatment of symptomatic atlantoaxial instability
in Down syndrome and to assess factors associated with fusion failure in this group of …

Os odontoideum can lead to atlantoaxial instability, which can be either reducible or a fixed
dislocation. We present surgical management in four patients with os odontoideum at our …

OBJECTIVE This study aimed to compare the clinical results of using posterior fixation and
fusion with or without anterior decompression to treat os odontoideum with atlantoaxial …