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Physical activity and knee structural change: a longitudinal study using MRI.

Stella Foley1, Changhai Ding, Flavia Cicuttini

  • 1Menzies Research Institute, University of Tasmania, Hobart, Australia. sjfoley@utas.edu.au

Medicine and Science in Sports and Exercise
|May 3, 2007
PubMed
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Physical activity, including muscle strength and endurance, may protect knee cartilage volume and tibial plateau area from loss. However, it may also cause bone enlargement, indicating both beneficial and detrimental effects on knee structure.

Area of Science:

  • Orthopedics and Sports Medicine
  • Radiology
  • Biomedical Engineering

Background:

  • Exercise therapy is recognized for improving knee osteoarthritis symptoms.
  • The impact of exercise on the structural integrity of knee joints requires further elucidation.

Purpose of the Study:

  • To investigate the relationship between physical activity levels and structural knee joint changes.
  • To assess knee joint structural modifications using magnetic resonance imaging (MRI).

Main Methods:

  • A cohort of 325 adult subjects underwent baseline and 2-year follow-up assessments.
  • Physical activity was quantified via questionnaires, physical work capacity (PWC170), and lower-limb muscle strength.
  • Knee cartilage volume, tibial plateau area, and cartilage defect scores were evaluated using MRI.

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Main Results:

  • Baseline lower-limb muscle strength correlated positively with cartilage volume and tibial plateau area changes.
  • Changes in muscle strength were inversely associated with tibial plateau area changes.
  • In females, baseline PWC170 was negatively linked to cartilage volume but positively to tibial plateau area; changes in PWC170 positively correlated with cartilage volume changes.

Conclusions:

  • Knee cartilage volume and tibial plateau area demonstrate dynamic responses to physical stimuli.
  • Enhanced muscle strength and endurance may offer protection against cartilage degradation, particularly in women.
  • Physical activity may lead to both beneficial effects (cartilage preservation) and potentially maladaptive outcomes (subchondral bone enlargement).