How Does Ossification of Posterior Longitudinal Ligament Progress in Conservatively Managed Patients? The incidence of OPLL progression in conservatively managed patients was 26.8% in vertical growth and 22.7% in thickness growth.Young age, mixed type, and C2-C3 involvement are risk factors of OPLL progression.Segments with morphology of crossing the segment, but not fusing (type 3), segmental ROM ≥ 5°, and initial segmental thickness > 5 mm carries higher risk of ossified mass progression."
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