Of the patients included in the study, 37 were treated simultaneously with decompression surgery at L3/4. Seven patients had symptomatic ASD — six in the decompression group and one in the PLIF-only group. According to the study’s abstract, local lordosis at the fused segment and the sagittal angle of the facet joint at L3/4 were statistically significant predictors of ASD.
“Patients whose facet joint at the adjacent segment had a more sagittal orientation had postoperative anterior listesis, which caused symptomatic ASD. Simultaneous decompression surgery without fusion at the adjacent level was not effective for these patients, but rather, there was a possibility that it induced symptomatic ASD,” concluded the study authors.
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