Influence of muscle forces on loads in internal spinal fixation devices

Spine
A RohlmannH M Mayer

Abstract

The loads acting on an internal spinal fixation device were measured in vivo. To determine the influence of muscle forces on implant loads. Only limited information exists regarding the loads acting on spinal implants in vivo. Though the muscles greatly influence spinal load, they have been neglected in most studies. Telemeterized internal spinal fixation devices were used to study the influence of muscle forces on the implant loads in three patients before and after anterior interbody fusion. Contracting abdominal or back muscles in a lying position was found to significantly increase implant loads. Hanging by the hands from wall bars as well as balancing with the hands on parallel bars reduced the implant loads compared with standing; however, hanging by the feet with the head upside down did not reduce implant loads compared with lying in a supine position. When lying on an operating table with only the foot end lowered so that the hips were bent, the patient had different load measurements in the conscious and anesthetized state before anterior interbody fusion. The anesthetized patient evidenced predominately extension moments in both fixators, whereas flexion moments were observed in the right fixator of the conscious pat...Continue Reading

References

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Citations

Jul 13, 2002·Journal of Biomedical Materials Research·Michael HahnMichael Morlock
May 21, 2011·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Vijay K GoelSanghita Bhattacharya
Jun 16, 2000·Journal of Biomechanics·A RohlmannG Bergmann
Mar 29, 2001·Clinical Biomechanics·T ZanderG Bergmann
Jan 5, 2000·Clinical Biomechanics·A RohlmannG Neff
Dec 12, 1997·Medical Engineering & Physics·A RohlmannU Weber
Apr 14, 2000·Neurosurgery·N Theodore, V K Sonntag
Dec 10, 1999·Biomedizinische Technik. Biomedical Engineering·M HahnO Mahrenholtz
Jun 5, 2012·The Journal of the American Academy of Orthopaedic Surgeons·Eric H LedetGeorg Bergmann
Jan 18, 2005·The Spine Journal : Official Journal of the North American Spine Society·Eric H LedetRichard L Uhl
May 3, 2005·Applied Optics·Abdelmalek HanafiJean-Yves Cornu
Jan 11, 2002·Physical Therapy·Antonius RohlmannGeorg Bergmann
Jan 21, 2020·Technology and Health Care : Official Journal of the European Society for Engineering and Medicine·Yorck RommelspacherRobert Pflugmacher
Jun 8, 2002·Biomedizinische Technik. Biomedical Engineering·A RohlmannG Bergmann

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