5 findings on iliac screw loosening after adult spinal deformity

Written by Laura Dyrda | August 31, 2017 | Print  |

A new study published in Spine examines iliac screw loosening after adult spinal deformity surgery.

 

The study authors examined 72 patients who underwent adult spinal deformity procedures with bilateral iliac screws. The patients had at least two years of follow-up. Study authors found:

 

1. Nearly 28 percent of the patients reported iliac screw loosening and 9.7 percent of the patients reported S1 screw loosening.

 

2. The iliac screw loosening was apparent around five months after surgery on average, and patients who reported screw loosening had higher upper thoracic fusion rates and lower interbody fusion rates.

 

3. When compared with patients who didn't have screw loosening, the patients who did reported a higher misplacement rate and higher insufficient correlation rate.

 

4. Among the patients who didn't experience loosening, Oswestry Disability Index scores improved, but there wasn't a significant difference in ODI scores among those who reported loosening.

 

5. Study authors concluded, "Iliac screw loosening indicated instability of the lumbosacral junction, resulting in sagittal malalignment and poor outcomes. Accurate screw insertion and restoration of optimal [incidence-lumbar lordosis] were necessary to prevent complications."

 

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