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Related Experiment Videos

Loads on an internal spinal fixation device during physical therapy.

Antonius Rohlmann1, Friedmar Graichen, Georg Bergmann

  • 1Orthopaedic Biomechanics Laboratory, Free University of Berlin, UKBF, Hindenburgdamm 30, 12200 Berlin, Germany.

Physical Therapy
|January 11, 2002
PubMed
Summary
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Physical therapy exercises can significantly load spinal fixation devices. Walking generates the highest loads, increasing the risk of pedicle screw breakage, while recumbent positions pose minimal risk.

Area of Science:

  • Spinal biomechanics
  • Orthopedic implant technology
  • Physical therapy assessment

Background:

  • Modified internal spinal fixation devices enable measurement of in-vivo forces and moments.
  • Understanding implant loads during rehabilitation is crucial for patient safety.

Purpose of the Study:

  • To quantify the loads experienced by internal spinal fixation devices during various physical therapy positions and movements.
  • To assess the risk of implant failure associated with different rehabilitation activities.

Main Methods:

  • Telemeterized spinal fixation implants were used to measure loads in 10 patients.
  • Measurements were taken across a range of body positions and therapeutic movements.

Main Results:

Related Experiment Videos

  • Recumbent positions and exercises in lying resulted in low implant loads, below standing levels.
  • Walking produced the highest loads (128% of standing).
  • Activities like standing up, sitting down, bending, and twisting while standing increased loads (111-120% of standing).

Conclusions:

  • Walking poses the greatest risk for pedicle screw breakage due to high bending moments and frequent loading.
  • Certain upright movements (standing up, sitting down, bending, twisting) may slightly increase breakage risk.
  • Ventral flexion/extension while standing can considerably increase risk if distraction occurs.