Evaluation of a Lumbar Intervertebral Spacer With Integrated Screws as a Stand-alone Fixation Device
| Autor: | Joseph L. Turner, Randall F. Dryer, Carlos A. Castro, Brian P. Beaubien, Andrew L. Freeman, Lindsey G. Waugh, William D. Armstrong |
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| Rok vydání: | 2010 |
| Předmět: |
Male
musculoskeletal diseases Polymers Bone Screws Biocompatible Materials Polyethylene Glycols Weight-Bearing Benzophenones Fixation (surgical) Postoperative Complications Lumbar Cadaver Peek Humans Medicine Orthopedics and Sports Medicine Range of Motion Articular Aged Orthodontics Lumbar Vertebrae business.industry Biomechanics Torsion (mechanics) Ketones Middle Aged musculoskeletal system Internal Fixators Radiography Spinal Fusion surgical procedures operative Axial torsion Female Surgery Stress Mechanical Neurology (clinical) business Range of motion Cadaveric spasm |
| Zdroj: | Journal of Spinal Disorders & Techniques. 23:351-358 |
| ISSN: | 1536-0652 |
| DOI: | 10.1097/bsd.0b013e3181b15d00 |
| Popis: | STUDY DESIGN An in vitro cadaveric biomechanics study. OBJECTIVE To evaluate the biomechanical contribution of the integration of screws into a polyether-ether-ketone (PEEK) spacer, and to compare the resulting construct to standard anterior lumbar interbody fusion constructs. SUMMARY OF BACKGROUND DATA Pedicular fixation is often performed to increase the rigidity of anterior lumbar interbody fusion constructs but also increases the risk of morbidity. Integration of screws into a PEEK spacer (investigational device, ID) may increase construct rigidity and prevent migration without the drawbacks associated with supplementary fixation. METHODS Twenty cadaveric motion segments were potted and tested under pure moments of + or - 7.5 Nm in flexion-extension, lateral bending, and axial torsion. Discectomies were performed and specimens were instrumented with the ID + or - screws, dual threaded cages, structural graft+anterior plate, and graft+pedicle screws. The ID+screws and threaded cage constructs were then pulled out at a constant rate. RESULTS All constructs reduced the mean range of motion (ROM) below the intact level in flexion-extension and lateral bending (P |
| Databáze: | OpenAIRE |
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