Volume 58 No 5  Cover Story

Ossification of the ligamentum nuchae (OLN) is usually asymptomatic and incidentally observed in cervical lateral radiographs. In this study, authors reported that the prevalence of ossification of the posterior longitudinal ligament (OPLL) was higher in patients with OLN than in patients without OLN and the larger types of OLN was related with long level OPLL.