In our study, 70% of the patients reported good outcome on the short-term which dropped to 53% on the long-term. This long-term moderately satisfying result has also been documented by Lequin et al [6]. Since 40% of our patients have been operated before at the index level, could mean that some of the patients presented with failed back surgery syndrome, which is associated with poor surgical outcome [10]. Another explanation of poor long-term results could be the subsidence of the stand-alone cage with consequent decrease of disc height, which occurred in 9 patients to some extent.