Related Experiment Videos
Repair of failed transpedicle screw fixation. A biomechanical study comparing polymethylmethacrylate, milled bone,
B A Pfeifer1, M H Krag, C Johnson
1Lahey Clinic, Boston, Massachusetts.
Spine
|February 1, 1994
Abstract:
In a random, controlled laboratory study, pedicle screws placed in human cadaveric vertebrae were axially loaded to failure. Three repair methods were tested. Use of low pressure polymethylmethacrylate yielded 149% of the original pullout strength, milled bone yielded 70% of the initial pullout strength, and matchstick bone yielded 56% of the initial pullout strength. Two incidents of cortical penetration during reinsertion in the matchstick group occurred. The results were statistically analyzed.