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Loads on internal spinal fixators measured in different body positions
A Rohlmann1, G Bergmann, F Graichen
1Oskar-Helene-Heim, Biomechanics Laboratory, Clayallee 229, D-14195 Berlin, Germany. rohlmann@biomechanik.de
Summary
Internal spinal fixation device loads vary by patient and position. Upright positions create higher flexion moments, but sitting loads are comparable to standing, suggesting patients can sit post-surgery.
Area of Science:
- Spine surgery
- Orthopedic biomechanics
- Spinal implants
Background:
- Internal spinal fixation devices are crucial for stabilizing the spine after surgery.
- Understanding the biomechanical forces on these implants in various body positions is essential for patient recovery and rehabilitation protocols.
Purpose of the Study:
- To quantify the loads experienced by telemeterized internal spinal fixation devices in different patient body positions.
- To compare implant loads between standing, sitting, and various lying positions (supine, prone, lateral).
Main Methods:
- Ten patients with telemeterized internal spinal fixation devices were monitored.
- Implant loads were measured across different body positions: standing, sitting, supine, prone, and lateral.
Main Results:
- Significant patient-to-patient variability in implant loads was observed, influenced by surgical indication and procedure.
- Anterior interbody fusion altered implant loads.
- Flexion bending moments were substantially higher in upright (standing/sitting) positions compared to lying positions.
- Implant loads during sitting were not significantly higher than during standing.
Conclusions:
- Body position significantly impacts spinal implant loads, with upright postures inducing greater flexion moments.
- The biomechanical loads during sitting are comparable to standing, supporting early mobilization.
- Patients undergoing mono- or bisegmental spine stabilization can be permitted to sit once ambulatory.