Mechanical testing of a flexible fixation device for the lumbar spine

The aim of this study was to test mechanically a new flexible fixation syst em for the lumbar spine. This device incorporates loops of polyester braid which are secured by a crimped titanium sleeve. In tensile tests, all loops failed, by slippage through the crimped sleeve, at 434 +/- 25 N (mean +/- standard deviation from five loops) for a single crimp and 415 +/- 15 N (fr om five loops) for two crimps. The intact system was then tested according to the ASTM standard. In a static test, all five specimens failed by slippa ge of the braid through the sleeve. Initial slippage occurred between 600 a nd 700 N, but the mean maximum load sustained was 1090 +/- 140 N. Dynamic t ests were performed on ten constructs at a frequency of 5 Hz, under a range of loading conditions. The maximum load applied in any of the tests was 82 5 N. Two constructs did not complete the required 5 x 10(6) test cycles bec ause of fracture of their spinous process hooks. However, other tests, unde r the same conditions, showed no signs of failure. Fracture occurred as a r esult of fretting damage from the recommended stainless steel roll pins.