2004, Number s1
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ABSTRACTMaterial and methods. A cohort analysis was conducted on 74 patients who underwent instrumentation fusion of the spine with a dorsal approach. Spines were operated regardless of etiology, age or gender of patients. Patients were randomized into 2 groups, 37 to a group. One group had the spine posterior ligament system (PLS) spared. The other group did not. Both were followed up for an average 30 months. The variable at issue was the development of kyphosis on the cephalic end of the instrumentation as an X-ray complication during the postoperative period. Statistical analysis was done by simple frequencies and inferred statistics using Mann-Whitney´s “U” and Fisher’s testing kyphosis and their postoperative grading. Results. The median age of patients was 13.5 years (ranging between 9 and 28 years). Females prevailed by 65%; prevailing etiologies were idiopathic scoliosis (62.2%) and Scheuermann disease (14.8%). The group having their spine posterior ligament system spared had a lower incidence of postoperative kyphosis (p ‹ 0.001) and less loss of correction in kyphosis degrees (p = 0.037). Conclusion. Sparing the spine posterior ligament system in patients under posterior instrumentation showed a lower incidence of postoperative kyphosis of the instrumentation cephalic end compared to patients who had not their ligament system spared.
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