ABSTRACT
PURPOSE: To evaluate the biomechanical results according to various anterior spinal fixation methodology in the treatment of thoracolumbar spine fracture. MATERIALS AND METHODS: The comparative analysis of fixation method was evaluated by three dimensional finite element model using the 1 mm reconstruction image of CT. Authors evaluated the flexion, extension, lateral bending, torsional stresses with 12 fixation methods for the compression and burst fracture. RESULTS: In biomechanical analysis, stiffness of body-fixation device was more stable in two-rod system in compression fracture and was stable in one-rod, two-rod system in burst fracture, but two-rod system was showed over-increase of stiffness. CONCLUSION: Authors recommend the usage of two-rod system in anterior fixation only and anterior one-rod system in anterior-posterior fixation.
Subject(s)
Fractures, Compression , Methods , SpineABSTRACT
PURPOSE: We reviewed the clinical result of two techniques of anterior fixation method for unstable pelvic ring injuries, which are external and internal fixation. MATERIALS AND METHODS: A retrospective clinical analysis was performed on 33 cases which had been operated from September 1998 to February 2003.Mean follow-up period is 29 months (range, 12-54 months).Previous to anterior fixation percutaneous iliosacral screw fixation was applied on iliosacral joint in Type C injury. After then plate and screw fixation were done in 17 cases and external fixation in 16 cases as an anterior fixation method. The patient' functional outcome was evaluated by Postel score and comparison between two groups was performed. RESULTS: In external fixator group the complaints are long duration of application of external fixator, excessive scar formation due to pin tract infection, pain and discomfort (Postel score 9.9;range, 8-11) due to malunion. In internal fixation group all of them showed more than good result and satisfactory to the postoperative condition and clinically (Postel score 11.6;range, 10-12). CONCLUSION: An open reduction and internal fixation technique is better than external fixation for the treatment of injured anterior pelvic ring in unstable pelvis fracture.
Subject(s)
Cicatrix , External Fixators , Follow-Up Studies , Joints , Pelvis , Retrospective StudiesABSTRACT
Objective To explore the efficacy of ZPLATE TM anterior fixation systems in the treatment of thoracolumbar fractures and dislocations.Methods 13 cases with old thoracolumbar fractures and dislocations accompanied with spinal cord injury have been treated by anterior decompression,implanting bone union and internal fixation with ZPLATE TM anterior fixation systems.Results After an average of 15 5 months followup,No plate and screw was loose and fragmentized,there is no pseudoarticulation formation,average union time are 3 7 months, and paraplegia showed different degrees of recovery.Conclusion It suggests that anterior approach provids thorough decompression and ZPLATE TM anterior fixation systems is a good spinal fixation system for the treatment of old thoracolumbar fractures and dislocations with the characteristics of strong fixation.