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Loads on a telemeterized vertebral body replacement measured in two patients
Antonius Rohlmann1, Friedmar Graichen, Ralph Kayser
1Biomechanics Laboratory, Charité, Campus Benjamin Franklin, Berlin, Germany. rohlmann@biomechanik.de
Spine
|May 13, 2008
Summary
High forces act on vertebral body replacements (VBRs) post-surgery. Avoid upper body flexion and climbing stairs in the first few months to reduce implant loads.
Area of Science:
- Spinal surgery biomechanics
- Orthopedic implant load analysis
Background:
- Limited data exists on loads acting on vertebral body replacements (VBRs).
- Previous studies measured intradiscal pressure and loads on spinal fixation devices.
Purpose of the Study:
- To measure in vivo implant loads on a VBR during various activities.
- To assess loads within the first 6 months after VBR implantation.
Main Methods:
- Telemeterized VBRs were implanted in two patients with L1 vertebral fractures.
- In vivo measurement of 3 force and 3 moment components on the implant.
- Implant loads were recorded during several activities in the first 6 months post-surgery.
Main Results:
- Resultant forces during standing were approximately 270-300 N one month post-surgery.
- Loads during relaxed lying positions were less than 30% of standing loads.
- Upper body flexion and walking upstairs resulted in loads more than double those during standing.
Conclusions:
- Vertebral body replacements (VBRs) experience significant forces, particularly in the early postoperative period.
- Activities like upper body flexion and stair climbing generate high implant loads.
- Patients should avoid strenuous activities in the initial months after VBR surgery.