No abstract

The findings demonstrate a learning curve for PS placement. In this series, the asymptote for this technique for an inexperienced SSF, started after about 80 screws (approximately 25 cases).

Spinal deformity in these patients tended to progress despite the achievement of spine arthrodesis in those with hyperkyphosis and short curves. The study shows that vertebral subluxation, disc wedging, and peripheral skeletal dystrophy are additional prognostic features that predict the progression of deformity after arthrodesis of the spine.

The rate of PS misplacement in the mid thoracic spine (T4-T9) is high and correlates with pedicle transverse diameter.