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• W2969850598 abstract "BACKGROUND CONTEXT Precontoured spinal rods are growing in their utilization for spinal deformity. Although there are theoretical advantages to precontouring rods, no previous studies have compared precontoured and manually contoured rods for their ability to maintain sagittal contour and resist mechanical load. PURPOSE To compare the biomechanical properties of roll-formed precontoured spinal rods with manually contoured rods of the same diameter. STUDY DESIGN/SETTING Biomechanical study utilizing a rigid, thoracolumbar spinal deformity model. OUTCOME MEASURES Load to reduction, rod plastic deformation METHODS A spinal deformity model was utilized, simulating a rigid, thoracolumbar spinal deformity fixated with pedicle screws. Roll-formed precontoured and manually contoured 5.5 mm and 6.0 mm cobalt chromium (Co-Cr) rods were reduced to the model with a load cell attached to the apical screw to measure reduction force. Rods remained reduced in the model for 20 minutes and change in contour was assessed to characterize plastic deformation. Reduction loads and plastic deformation was compared between rod groups using paired T-tests. RESULTS Twenty-four rods were tested with 6 rods per group. The load to reduction was significantly lower in the 5.5 mm rods compared to the 6.0 mm rods (95% C.I. -254.0 - -61.42; p=0.008). Although there was no difference in the load to reduction for manual and precontoured 5.5 mm rods (437.01 N vs 428.38 N; p=0.722), the precontoured 6.0mm rod required significantly less load to reduction compared to the manually contoured 6.0 mm rods (586.09 N vs 655.97 N; 95% C.I. -134.42 - -5.317; p=0.039). Additionally, rod contour for the manual group showed significantly less plastic deformation than the pre-contoured group in both 5.5mm and 6.0mm rods (5.5mm: 57.1% vs 61.6%, p=0.006; 6.0mm: 54.3% vs 62.28%, p=0.003). CONCLUSIONS Roll formed, precontoured Co-Cr rods demonstrated significantly greater plastic deformation when compared with manually contoured rods of the same diameter. Furthermore, 6.0mm precontoured rods required significantly lower load for rod reduction. Post-manufacturing, roll-formed pre-contouring of larger diameter Co-Cr may impair the rods mechanical properties. FDA DEVICE/DRUG STATUS Unavailable from authors at time of publication." @default.
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• W2969850598 date "2019-09-01" @default.
• W2969850598 modified "2023-09-27" @default.
• W2969850598 title "292. Are precontoured spinal rods mechanically superior to manually contoured rods?" @default.
• W2969850598 doi "https://doi.org/10.1016/j.spinee.2019.05.308" @default.
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