Long-term loss of intervertebral disc height after posterior cervical surgery for ossification of the posterior longitudinal ligament: a retrospective study with more than 3 years of follow-up.

As shown in Table 6 , patients with continuous or mixed OPLL exhibited a tendency toward smaller postoperative disc height loss and a lower proportion of cases with loss > 1 mm compared with those with segmental or localized OPLL, although these differences did not reach statistical significance.

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