Bilateral open-door cervical expansive laminoplasty with hydroxyapatite spacers and titanium screws.

Abstract:

OBJECT:The authors report a simple method for bilateral open-door cervical expansive laminoplasty in which hydroxyapatite (HA) spacers are secured by titanium screws. A biomechanical study was also conducted to confirm the strength of the screw fixation. METHODS:A unilateral posterior approach was used to allow preservation of the posterior supporting elements (the posterior tension band) until the laminae were cut at the base. A bilateral open-door expansive laminotomy was then performed in standard fashion. Appropriate-sized HA spacers were selected, held with a specially designed holder, and placed between the split laminae. The screw holes were made in the laminae along the direction of the screw holes in the spacer, and two screws were inserted ventrolaterally to the laminae, resulting in instantaneous fixation. This procedure was performed in 15 patients; clinical results were successful, and there were no significant intraoperative complications. Follow-up radiological studies revealed no evidence of displacement of the spacers or screw backout. The screw artifacts observed on magnetic resonance imaging were minimal, allowing evaluation of the cervical spinal cord. The sagittal alignment of the cervical spine was well preserved. In the biomechanical studies the authors found that the screw fixation was of satisfactory strength, compared with other methods of fixation. CONCLUSIONS:Bilateral open-door cervical expansive laminoplasty in which HA spacers are secured by titanium screws is a simple and quick method that yields sufficient fixation strength.

journal_name

J Neurosurg

journal_title

Journal of neurosurgery

authors

Takayasu M,Takagi T,Nishizawa T,Osuka K,Nakajima T,Yoshida J

doi

10.3171/spi.2002.96.1.0022

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

22-8

issue

1 Suppl

eissn

0022-3085

issn

1933-0693

journal_volume

96

pub_type

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