[Comparison of allogenic versus ostetic artificial bone in double door laminoplasty]

To study the application of allogenic bone and Ostetic artificial bone in double door laminoplasty.

From June 2004 to June 2010, a total of 111 patients underwent double door laminoplasty. And allogenic (group A, n = 63) and Ostetic artificial (group B, n = 48) bones were used. They had spinal stenosis at least several levels or OPLL (Ossification of posterior longitudinal ligament). Their follow-up period was 12 months. Anteroposterior compression ratio was used to evaluate the neurological status. Range-of-movement (ROM) of cervical spine and bone fusion was determined by radiography and computed tomography (CT) during the follow-ups.

Anteroposterior compression ratio: group A improved from 0.18 preoperation to 0.43 postoperation while group B increased from 0.20 preoperation to 0.44 postoperation; ROM: group A decreased postoperatively to (22.6 ± 3.3)° from (39.5 ± 6.1)° while group B decreased postoperatively to (22.9 ± 3.7)° from (39.3 ± 6.7)°. When Groups A and B were compared, bone fusion between allograft and spinous processes was completed in 73.1% vs 64.2%, partial fusion in 22.4% vs 18.7% and failed in 6.3% vs 17.1%.

Uses allogenic and Ostetic artificial bones in double door laminoplasty may achieve an excellent decompression of spinal cord. But the application of allogenic bone yields a higher bone fusion rate after surgery.