Transarticular screw fixation offers acceptably high fusion rates but is not possible in 18% of patients due to a high riding vertebral artery. It also requires pre-operative anatomical reduction which is not always possible. The Harms' technique utilises a posterior C1 lateral mass and C2 pedicle screw. This allows easier access due to the angle of drilling and has become an increasingly popular surgical technique. The aim of this study is to review and compare the above techniques with regard to surgery, complications and outcome. This study is a retrospective chart and radiographic review of patients undergoing posterior C1-2 fusion in a single institution in the period 2003 to 2011. The most common aetiology was rheumatoid arthritis and post-traumatic instability. All atlanto-axial instability patients that came to surgery are included in this study, and only cases with less than six months follow-up were excluded. We report on surgical indications, surgical outcomes, complications and radiographic outcomes.Purpose of study
Description of methods
