Abstract
Objective: To evaluate the subjective clinical outcomes, radiographic results and complications associated with single solid rod anterior instrumentation in neuromuscular scoliosis.
Design: Retrospective clinical case series with a mean follow up of 30 months (range 24 – 42 months).
Subjects: 9 consecutive cases (6F, 3M) with a mean age 15 years (range 11 – 24 years), underwent single solid rod anterior instrumentation of their neuromuscular thoracolumbar scoliosis between 1994 and 2000. The heterogeneous patient group consisted of 5 spinal dysraphism, and 1 each of prune belly syndrome, arthrogryposis, myotonic dystrophy and congenital myopathic dystrophy (muscle eye brain syndrome). All patients were ambulatory and had minimal pelvic obliquity (< 15 degrees).
Outcome measures: Pre-operative, post-operative and final follow up measurements were collected for 1) Cobb angles, 2) apical vertebral translation (AVT), 3) thoracic kyphosis (T5-12) and 4) lumbar lordosis (L1-5). Operative complications, pseudarthrosis, metalwork failure and loss of correction were also recorded.
Results: There was 1 each of rod breakage and upper thoracic curve progression requiring supplementary posterior surgery. For the remaining 7 patients, the average follow-up corrections for Cobb angle was 56% (49 to 22 degrees), AVT was 49% (5.1 to 2.6 cms), and both the thoracic kyphosis and lumbar lordosis remained unchanged. No significant loss in correction occurred during the post-operative period to final follow-up in all the above parameters. No pseudarthrosis, vascular or neurological complications were encountered. Subjectively, there were 6 excellent and 1 good results.
Conclusions: In this limited case review, selective anterior instrumentation for neuromuscular scoliosis using a single solid rod system resulted in acceptable clinical and radiographic outcomes. Our results appear to compare favourably with those published for the recommended method of posterior instrumentation. Advantages include preservation of distal lumbar motion segments whilst maintaining segmental saggital and coronal alignment. We believe that this method of scoliosis correction has a definite yet select role in patients who are ambulatory, have minimal pelvic obliquity (< 15 degrees), non-progressive pathology and near normal mental function.
The abstracts were prepared by Mr Peter Millner. Correspondence should be addressed to Peter Millner, Consultant Spinal Surgeon, Orthopaedic Surgery, Chancellor Wing, Ward 28 Office Suite, St James’ University Hospital, Beckett Street, Leeds LS9 7TF.
