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Croat Med J. 2011 Apr 15;52(2):164-70.

Muscle strength and bone density in patients with different rheumatic conditions: cross-sectional study.

Author information

1
Department for Environmental and Occupational Health; Institute for Medical Research and Occupational Health, Ksaverska cesta 2, Zagreb, Croatia. cvijetic@imi.hr

Abstract

AIM:

To explore the relationship between muscle strength and bone density in patients with different rheumatic diseases and to examine whether inflammatory arthritis was more harmful for muscle strength and bone loss than degenerative joint diseases.

METHODS:

The study included 361 men and women with a mean±standard deviation age of 60.5±11.4 years and different rheumatic conditions: regional syndromes, osteoarthritis of the hands, shoulders, knees, and hips, and inflammatory arthritis. Maximum voluntary back strength was measured by isometric dynamometry. Bone mineral density (BMD; g/cm2) of the lumbar spine, femoral neck, and distal radius was measured by dual-energy x-ray absorptiometry. Anthropometry and lifestyle characteristics were also assessed.

RESULTS:

Back strength was lowest in patients with hand and shoulder osteoarthritis (20.0±17.9 kg), followed by patients with inflammatory arthritis (24.8±19.2 kg). Patients with inflammatory arthritis had the lowest BMD at the mid-radius (0.650±0.115 g/cm2) and femoral neck (0.873±0.137 g/cm2), while patients with hand and shoulder osteoarthritis had the lowest BMD at the mid-radius (0.660±0.101). In both sexes, muscle strength was significantly lower in patients who had lower BMD (T score<-1.0). Multiple regression analysis identified significant predictors of back strength to be spine BMD (P=0.024) and body mass index (P=0.004) in men and femoral neck BMD in women (P=0.004).

CONCLUSION:

Muscle strength decline may be connected to bone loss in patients with rheumatic conditions, especially those with inflammatory joint diseases.

PMID:
21495199
PMCID:
PMC3081215
DOI:
10.3325/cmj.2011.52.164
[Indexed for MEDLINE]
Free PMC Article

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