Are clinical outcomes affected by laminoplasty method and K-line in patients with cervical ossification of posterior longitudinal ligament? A multicenter study

Table 5 Stratified analysis of type of laminoplasty on association between effectiveness and K-line

mFDL modified French-door laminoplasty, ODL open-door laminoplasty, OR odds ratio, CI confidence interval, JOA Japanese Orthopaedic Association, RR recovery rate
^*Grouped by the variables below. Outcome variables: grouped by postoperative JOA score (bounded by ≥ 14), grouped by operative time (bounded by ≥ 90 min), grouped by blood loss (bounded by ≥ 300 mL), grouped by JOA score recovery rate (bounded by 0.82). Stratification factors: type of laminoplasty (groups: mFDL and ODL). Independent variables: K-line (+) and (−). The adjusted covariates for the JOA score and its RR were age, sex, BMI, preoperative JOA score, follow-up duration, and OPLL type. The adjusted covariates for operative time and blood loss were age, sex, BMI, preoperative JOA score, and OPLL type

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