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Loads on internal spinal fixation devices.

A Rohlmann1, G Bergmann1, F Graichen1

  • 1Oskar-Helene-Heim, Orthopädische Klinik und Poliklinik, Freie Universität Berlin, Germany.

Der Orthopade
|March 2, 2017
PubMed
Summary
This summary is machine-generated.

Internal spinal fixation devices experience highest loads during walking and lateral bending. Sitting imposes no greater load than standing, suggesting it

Keywords:
Key words Internal spinal fixation device • Loads • Telemetry • Anterior interbody fusion • Brace

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Area of Science:

  • Spinal biomechanics
  • Orthopedic surgery
  • Biomedical engineering

Background:

  • Internal spinal fixation devices are crucial for stabilizing the spine after surgery.
  • Understanding the biomechanical loads on these implants during daily activities is essential for patient recovery and implant longevity.

Purpose of the Study:

  • To quantify the loads on internal spinal fixation devices during various patient activities.
  • To evaluate the impact of different activities and surgical procedures on implant loads.
  • To determine the efficacy of bracing in reducing implant loads.

Main Methods:

  • Telemeterized bisegmental implants were used to measure loads in ten patients.
  • Implant loads were recorded during activities such as walking, bending, sitting, and standing.
  • The influence of anterior interbody fusion and bracing on implant loads was assessed.

Main Results:

  • Highest loads were observed during walking and lateral bending while standing.
  • Forward bending of the upper body resulted in only slight alterations in fixator loads.
  • Forces and moments during sitting were comparable to standing, and were not increased.
  • Anterior interbody fusion, particularly in patients with degenerative instability, led to higher implant loads.
  • Braces showed no significant reduction in fixator loads.

Conclusions:

  • Sitting can be permitted for patients with instrumented spines once they are able to get up.
  • Anterior interbody fusion may increase implant loads, especially in cases of degenerative instability.
  • Bracing appears ineffective in reducing implant loads after mono- or bisegmental spinal stabilization.