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Related Concept Videos

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Related Experiment Video

Updated: Dec 31, 2025

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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Spaceflight-Induced Bone Tissue Changes that Affect Bone Quality and Increase Fracture Risk.

Jennifer C Coulombe1,2,3, Bhavya Senwar1,2,3, Virginia L Ferguson4,5,6

  • 1Department of Mechanical Engineering, University of Colorado, UCB 427, Boulder, CO, 80309, USA.

Current Osteoporosis Reports
|January 4, 2020
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Astronaut bone fragility from spaceflight involves reduced bone mass and impaired bone quality. New assessments are needed to understand fracture risk and identify therapeutic targets for skeletal health.

Keywords:
ArchitectureBMDBoneFractureMicrogravityQualitySpaceflight

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Area of Science:

  • Spaceflight research
  • Skeletal biology
  • Bone biomechanics

Background:

  • Current assessments of astronaut skeletal health, including bone mineral density, do not fully predict fracture risk.
  • Long-duration spaceflight poses unique challenges to bone health, necessitating a deeper understanding of skeletal fragility.

Purpose of the Study:

  • To review the impact of microgravity on bone structural and material quality.
  • To highlight the need for advanced bone assessment methods in astronauts.
  • To identify potential biomarkers and therapeutic targets for spaceflight-induced bone loss.

Main Methods:

  • Review of existing literature on bone quality changes in astronauts and animal models.
  • Analysis of microgravity effects on bone formation, resorption, and microarchitecture.
  • Examination of impaired tissue mineralization and osteocyte-mediated maintenance.

Main Results:

  • Spaceflight compromises bone mass through reduced formation and increased resorption.
  • Microgravity diminishes bone structural quality (trabecular microarchitecture) and material quality (mineralization, maturation).
  • These combined effects can jeopardize astronaut readiness and increase fracture risk upon return to gravity.

Conclusions:

  • Bone structural and material quality are critical factors in microgravity-induced skeletal fragility.
  • Future research must integrate bone quality with bone mass to predict fracture risk accurately.
  • Evaluating bone quality may reveal novel biomarkers and therapeutic strategies for astronauts.