RE-OPERATION RATES IN SPINAL SURGERY: A TEN YEAR REVIEW

The volume of spinal procedures have increased over the last two decades (220% in lumbar region). A simultaneous increase in re-operation rates (up to 20%) has been reported. Our aim was to compare with literature the reoperation rates and complications for various spinal procedures from a peripheral unit and to provide this information to the patients This was a retrospective study of all patients who underwent spinal surgery during the period 1995 to 2005 by one surgeon. Using ICDM-9 codes and private notes patients were identified and medical records were used to gather relevant data. The following information was extracted-demographics, diagnosis, ASA criteria, primary procedure, any complication/s, secondary procedures, duration of follow up and to secondary procedure. The index procedures were grouped into regional and according to indication. Both complications and reoperations were grouped into early (within three months) or delayed (after three months) from the index operation. Reoperation rates and complications were calculated and compared with literature. Four hundred and thirty-nine patients formed the study population. Five patients had inadequate data and were excluded. 23 patients have since died. Demographics showed 22% were smokers and 9% were either unemployed or sickness beneficiary. The commonest diagnosis in the lumbar spine was disc herniation (194). Stenosis and disc degeneration were the next most common surgical indications. In the cervical spine 27 patients had disc herniation and 15 patients were operated for trauma. Lumbar discectomy was the commonest procedure-191 patients with one third having microdiscectomy. Instrumented fusion was performed in 97 while 37 patients underwent decompression only. The majority of cervical spine patients (46) had discectomy and fusion. Stabilisation for trauma formed a reasonable workload in both cervical and lumbar regions. Early complications included dural tears (seven), neurological symptoms (eight), wound infections (12) and pulmonary embolism (one) and repeat disc herniation. Delayed problems included repeat disc herniation, pseudoarthrosis and implant related symptoms. Overall re-operation rate was 14.52% with 5.02% early and 9.4%delayed repeat surgery. Repeat discectomy (eight) and decompression and exploration (seven) were the common early reoperation whereas fusion post discectomy (19) and recurrent disc herniation (12) were indications for delayed intervention. Removal of metalware (8) was another large late re-operation group. Our re-operation rates fall within the quoted figures in literature. However our early re-operation rates are somewhat higher. These figures help us to inform patients better at the time of consent for the primary procedure especially lumbar disc surgery as most of the re-operation were required after discectomy.