Surgical Treatment of Scoliosis in Non-Ambulatory Spastic Quadriplegic Cerebral Palsy Patients: A Matched Cohort Comparison of Unit Rod Technique and All-Pedicle Screw Constructs.

STUDY DESIGN Matched cohort. OBJECTIVE To compare the unit rod instrumentation (UR) technique with all-pedicle screw (PS) constructs in the surgical care of scoliosis in Gross Motor Function Classification System IV/V non-ambulatory spastic quadriplegic cerebral palsy patients. SUMMARY OF BACKGROUND DATA Over the past 20 years, there has been a transition from the UR technique to the use of pedicle screws and iliac screws in neuromuscular scoliosis. To date, no head-to-head comparative analysis has been reported between the UR technique and PS constructs for posterior segmental spinal instrumentation and fusion in cerebral palsy patients. METHODS A matched cohort study was performed between 2 tertiary-care pediatric centers: 1 using UR technique and the other PS constructs. Minimum follow-up was 2 years postoperatively (PS 2.5 years, UR 4.6 years, not significant). Fourteen patients were matched from each center based on age (mean age: PS 15.4 years, UR 15.5 years), preoperative pelvic obliquity (mean: PS 33.8°, UR 29.1°) and major coronal Cobb angle (mean: PS 100.9°, UR 100.1°). RESULTS There was posterior-only surgery in 14 of 14 PS and 11 of 14 UR surgeries. The final follow-up Cobb angle was lower in the PS group (13.5° vs. 34.3°, p < .05), with 86.5% correction in the PS group and 65.7% in the UR group. Final follow-up pelvic obliquity was similar (PS 8.5° vs. UR 3.3°; not significant). There were no major complications in the PS group. In the UR group, there was 1 deep infection and 1 reoperation for removal of a prominent sublaminar wire. CONCLUSIONS This is the first study to directly compare UR with PS constructs using matched patient cohorts in this patient population. All-pedicle screw constructs had better correction of coronal Cobb angle, lower blood loss, and shorter hospital stays. There was no difference in the correction of pelvic obliquity, complications, or reoperations.