Топ-100

Ossification of the posterior longitudinal ligament

Ossification of the posterior longitudinal ligament is a process of fibrosis, calcification, and ossification of the posterior longitudinal ligament of the spine, that may involve the spinal dura. Once considered a disorder unique to people of Asian heritage, it is now recognized as an uncommon disorder in a variety of patients with myelopathy.

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1. Causes
The causes of OPLL are unknown. However, genetic and environmental factors appear to play a role in pathogenesis. OPLL may also be associated with diffuse idiopathic skeletal hyperostosis

2. Treatment
Surgical management options include extensive cervical laminectomy with or without an additional posterior arthrodesis, anterior decompression and arthrodesis, and posterior cervical laminoplasty. Treatment decisions can be made based on a grading systems devised by Hirabayashi et al., supplemented by the Nurick myelopathy classification system.

3. Prognosis
Most patients suffer from only mild symptoms. Symptoms typically last approximately 13 months. Of patients without myelopathy at initial presentation, only 29% of them will develop myelopathy within 30 years.

4. Epidemiology
The age range of patients with OPLL is from 32 to 81 years mean = 53, with a male predominance. Prevalence is higher in those of Japanese or Asian ancestry 2-3.5% and rarer in other racial groups 0.16%. Schizophrenia patients in Japan may have as high as 20% incidence.