Validation of vibration testing for the assessment of the mechanical properties of human lumbar motion segments

The vibration results showed clear eigenfrequencies for flexion-extension (mean 121.83 Hz, SD 40.05 Hz), lateroflexion (mean 132.17, SD 34.80 Hz) and axial rotation (mean 236.17 Hz, SD 81.45 Hz). Furthermore, the correlation between static and dynamic tests was significant (r=0.73, p=0.01). In conclusion, the findings from this study show that experimental modal analysis is a valid method to assess the mechanical properties of human lumbar motion segments.