C2–3 Interlaminar Bony Fusion Mitigates Long-Term Progression of Ossification of the Posterior Longitudinal Ligament Following Cervical Laminoplasty

= .0007) progression after adjustment for all confounders. Mixed-effects modeling confirmed a significantly flatter long-term progression trajectory in patients with interlaminar fusion. C2-7 ROM and patient-reported outcomes were comparable between groups.ConclusionsSpontaneous C2-3 interlaminar fusion is associated with attenuation of postoperative OPLL progression without compromising overall cervical motion or clinical outcomes. These findings suggest that C2-3 interlaminar fusion may function as a stabilizing postoperative phenomenon rather than an unfavorable radiologic change following cervical laminoplasty in multilevel OPLL patients.