Abstract:

BACKGROUND: In recent years, allograft bone and coral bone have been commonly used as the spacers after double-door expansive laminoplasty, which can easily result in rejection and non-fusion.
OBJECTIVE: To verify the effect of nano-hydroxyapatite artificial bone on posterior double-door expansive laminoplasty in the cervical spine.
METHODS: Totally 46 patients undergoing posterior double-door expansive laminoplasty in the cervical spine received nano-hydroxyapatite artificial bone as the spacers. All patients were followed-up for over 3 months. Japanese Orthopaedic Association (JOA) scores before and after nano-hydroxyapatite artificial bone grafting were compared. The fusion of bone graft with the cervical spine was detected by X-ray and CT.
RESULTS AND CONCLUSION: At final follow up, JOA scores were increased from preoperative (7.9±1.9) points to (12.1±2.8) points. No patients were found cervical spine instability as well as loosening and displacement of the bone graft postoperatively. The fusion between the nano-hydroxyapatite artificial bone and spinous process was good. These findings suggest that the nano-hydroxyapatite artificial bone is an ideal bone graft substitute material and applicable to double-door expansive laminoplasty.