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Online ISSN 1827-1707
Background. To describe the characteristics of the ossification of the posterior longitudinal ligament (OPLL) in Caucasian patients.
Methods. Thirty outpatients with radiologically proven OPLL were examined clinically and electromyographycally (EMG).
Results. This series differs in some way from the literature data. The male/female ratio is 1.5/2 and the most frequent ossification site is lumbar especially in females. In the literature the male/female ratio is about 3/1 and the most frequent ossification site is cervical. The age of patients (55.4±13.2 years) and the frequent association with other conditions (20/30 patients, mainly osteophytosis and/or herniated disc) are in agreement with the literature. The symptoms and EMG correlate with associated conditions rather than with the OPLL.
Conclusions. At least in part the disagreement with previous data may be related to selection of patients. At least in mild form, the OPLL seems not so rare among Caucasians as is usually believed and may be lumbar ossification is more common in females.