Sixty patients who underwent posterolateral fusion with Steffee instrumentation of the lumbosacral spine were reviewed and compared with 68 patients who underwent posterolateral fusions without internal fixation. Because the study was not randomized, the noninstrumented population was not considered to be a control group for the instrumented population. Eighty percent of the instrumented group was clinically improved compared with 63% of the non-instrumented group. Sixty-nine percent of the non-instrumented group had a solid radiographic union. At 12 months followup, the fusion in 20 (33%) of the instrumented group was considered to be indeterminate because, although no movement was evident on flexion-extension radiographs, overlying plates made visualization of the fusion mass impossible. At 24 months followup, the indeterminate group had decreased to 6 patients (10%) giving a fusion rate of 72% (43/60) in the instrumented group. The instrumented population was older, had more previous surgery and had more levels fused than the non-instrumented population, but the instrumented group had better clinical results and the same percentage of union.
|Original language||English (US)|
|Number of pages||9|
|State||Published - 1992|
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