Prediction of screw loosening by measuring the insertion torque in non-osteoporotic patients: an in vitro study.

The vertebral level had a significant effect on distraction force ( p < 0.01) and showed a trend of increasing possible distraction forces from thoracic (T9) to lumbar vertebrae (L4): 296.3 ± 51.9 N for T9, 248.3 ± 46.9 N for T10, 262.0 ± 52.1 N for T11, 266.4 ± 45.0 N for T12, 361.7 ± 72.0 N for L1, 364.4 ± 68.5 N for L2, 393.7 ± 54.2 N for L3, and 426.4 ± 65.7 N for L4 ( n ≥ 12).

also in 53,322 other papers