Novel biodegradable lamina for lamina repair and reconstruction.

Background Context: Posterior laminectomy is an effective spinal surgical procedure. The adhesion of postoperative scar tissue to surgically exposed dura and, occasionally, to nerve roots can cause failed back surgery syndrome. The establishment of a barrier between scar tissue and dura that is made of hard material may prevent scar adhesions.

Purpose: To evaluate the efficacy of a novel biodegradable multi-amino acid copolymer/nanohydroxyapatite composite artificial lamina.

Methods: A cervical laminectomy animal model in goats was used, and the animals were randomly divided into three groups. In the test group, cervical 4 was removed by laminectomy and the artificial lamina was inserted (n=12). In the control group, the incision was closed directly without implantation (n=9). The goats in the normal group did not undergo any procedure or treatment. Copolymer efficiency was tested by using X-ray, computed tomography scanning, magnetic resonance imaging, scanning electronic microscope, and histologic and biomechanical measurements 4, 12, and 24 weeks postoperation.

Results: No shifting of the artificial lamina or dural adhesion pressure was observed. New cervical natural bone formed in the defect and the bony spinal canal was rebuilt. In the control group, fibrous scar tissue filled the defect and exerted pressure on the dura. No paralysis was observed, and gait was normal in all test and control goats.

Conclusions: Artificial lamina can prevent the epidural adhesions surrounding the defect and promote effectively bone tissue repair and new bone formation.