[Posterior instrumented correction and fusion of adolescent idiopathic scoliosis].

Abstract

Objective: Balanced frontal curve correction with horizontal shoulder levels, restoration of sagittal plane and vertebral derotation with a fusion length as short as possible.

Indications: Curves larger than 40-50° Cobb angle; furthermore age, location, degree of rotation, and sagittal plane deviation have to be considered.

Surgical technique: Posteriorly, segmental pedicle screw instrumentation with a high screw density (80%) and both titanium alloy and cobalt chrome rods. Freehand screw placement under consideration of both natural and deformity-induced pedicle morphology. Correction via reduction screws or instruments. Combined correction technique with rod rotation, segmental screw approximation to the generally concave rod and segmental correction of vertebral translation. Moderate concave distraction and convex compression. If needed, final in situ bending of the rods. Schwab type I osteotomies; in rigid curves type II osteotomies. Fusion with local bone, allogenic bone and/or bone substitutes (i.e., tricalcium phosphate). Intraoperative placement of a thoracic epidural catheter for postoperative pain control. Neurological monitoring throughout the procedure.

Postoperative management: Mobilization on postoperative day 1 with focus on pain management and nutrition. Return to school after 4 weeks. Physiotherapy after 3 months, cycling after 3-6 months, and full sport activities after 1 year.

Results: Frontal curve correction of 60-80%, sufficient sagittal plane correction. Correction of rib hump 40%. Patient satisfaction is high at 95% and long-term revision rates of < 10%.