STUDY DESIGN: A nondestructive biomechanical investigation among five anterior spinal instrumentation systems for @entity1635 . OBJECTIVES: The purpose of this study is to analyze the static and dynamic biomechanical stability of five different systems. SUMMARY OF BACKGROUND DATA: Although a variety of anterior spinal instrumentation systems for @entity1635 are available, very few attempts have been made at comparative biomechanical studies. METHODS: Thirty @entity291 spines were underwent static biomechanical tests, including flexion-extension, @entity717 , and lateral bending loading modes in the multisegmental spinal model. Five anterior instrumentation systems included: 1) Texas Scottish Rite Hospital system; 2) Bad Wildungen Metz; 3) anterior ISOLA; 4) Cotrel-Dubousset Hoph; and 5) Kaneda Anterior Scoliosis System. The initial and postfatigue stability after a cyclic loading test were analyzed by measuring the range of motion at instrumented segments compared to the intact within the same specimen (% to intact). RESULTS: Two-rod systems showed a significant decrease in range of motion compared to one-rod systems in flexion-extension (P < 0.001) and @entity717 (P < 0.05). In lateral bending, all systems demonstrated a significant decrease in range of motion of less than 40% to the intact (P < 0.001). After cyclical loading test, all systems increased in range of motion. In flexion-extension, one-rod systems depicted a significant increase in range of motion, compared to two-rod systems (P < 0.05). CONCLUSIONS: In the initial stability analysis, two-rod systems are superior to one-rod systems. For one-rod systems, repeated physiologic loading may result in reduced stability in flexion-extension.

Static and dynamic analysis of five anterior instrumentation systems for XXXX .

@entity717 :: ('MESH:D009069', 'Disease') :: ['axial rotation'] @entity291 :: ('9913', 'Species') :: ['calf'] @entity1635 :: ('MESH:D012600', 'Disease') :: ['scoliosis']
@entity1635 :: (MESH:D012600,Disease) :: ['thoracolumbar scoliosis']
