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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Bone Remodeling01:40

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.

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Related Experiment Video

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Microstimulation at the bone-implant interface upregulates osteoclast activation pathways.

Vincent A Stadelmann1, Alexandre Terrier, Dominique P Pioletti

  • 1Laboratory of Biomechanical Orthopedics EPFL-HOSR, Institute of Translational Biomechanics, Station 15, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.

Bone
|November 17, 2007
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Summary

Micromotions at the bone-implant interface, not wear debris, initiate peri-implant bone resorption. This mechanical stress activates cell signaling pathways, leading to bone loss around joint replacements.

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Research
  • Cellular Signaling

Background:

  • Peri-implant bone resorption is a critical factor in aseptic loosening following total joint arthroplasty.
  • Both implant wear debris and biomechanical factors contribute to bone resorption, but the primary initiator remains unclear.
  • Previous studies suggest micromotions at the bone-implant interface influence bone tissue differentiation.

Purpose of the Study:

  • To investigate the hypothesis that micromotion and compression at the bone-implant interface directly activate bone resorption.
  • To elucidate the role of osteoblast-osteoclast cell signaling in response to mechanical stimulation in human bone.
  • To quantify the immediate effects of micromotion and compression on human bone tissue ex vivo.

Main Methods:

  • Developed an ex vivo loading system to simulate bone-implant interface micromotions.
  • Applied mechanical stimulation (compression or micromotions) to human trabecular bone cores.
  • Analyzed gene expression of key bone remodeling markers (RANKL, OPG, TGFB2, IFNG, CSF-1) post-stimulation.

Main Results:

  • Exposure to micromotions resulted in an 8-fold upregulation of RANKL gene expression.
  • Micromotions led to the downregulation of OPG, IFNG, and TGFB2.
  • The RANKL:OPG ratio significantly increased (24-fold) following micromotion exposure.

Conclusions:

  • Micromotions at the bone-implant interface, occurring during normal gait, rapidly induce a bone resorption response.
  • This mechanical stimulation activates bone resorption pathways before the potential influence of wear debris.
  • Findings highlight the critical role of biomechanical forces in initiating bone loss around joint implants.