AN ANALYTICAL STUDY ON THE RESULTS OF POSTERIOR FOSSA DECOMPRESSION AND LAX DUROPLASTY IN CHIARI 1 MALFORMATIONS.

Study design abstract Introduction Chiari malformations are a spectrum of congenital hindbrain abnormalities affecting the structural relationships in the cranio vertebral junction. Chiari 1 malformation is characterised by elongated peg like tonsils displaced inferiorly through the foramen magnum into upper cervical canal. Aim & Objectives To determine the surgical results and clinical-radiological follow up outcome of 28 patients with chiari 1 malformation following foramen magnum decompression with lax duroplasty. Methods The cranio vertebral junction and whole spine MRI scans of patients who underwent foramen magnum decompression with lax duroplasty were reviewed. The clinical improvement following surgery and postoperative complications were monitored. The level and severity of syrinx and upper cervical canal compression were compared. Results 16 patients presenting with spasticity in lower limbs had symptomatic reduction in the sense of tightness in the immediate post operative period. 1 patient presenting with trigeminal neuralgia had complete resolution of pain. Conclusion Foramen magnum decompression with lax duroplasty has withstood the test of time and still remains as the procedure of choice in patients with chiari 1 malformations with lesser postoperative morbidity and more symptomatic relief.