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Incidence of complications with instrumentation surgery and non-instrumentation surgery
| Incidence of complications | ||
|---|---|---|
| Instrumentation surgery | Non-instrumentation surgery | |
| 2011 | 15.6 % (1,480/9,487) | 8.2 % (1,786/21,893) |
| 2001 | 12.1 % | 6.8 % |
| 1994 | 15.5 % | 5.9 % |
