Fig. 2From: Risk factors for poor neurological outcomes after unilateral open-door laminoplasty: an analysis of the characteristics of ectopic boneThe lateral OPLL can be divided into an open door on the ipsilateral side and an open door on the contralateral side according to the position relationship between the open side and the largest ectopic bone. A Open door on the ipsilateral side. B Open door on the contralateral sideBack to article page