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

06:00 EDT 16th April 2011 | BioPortfolio

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

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.


Selma Cvijetic, Department for Environmental and Occupational Health; Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10001 Zagreb, Croatia,

Journal Details

This article was published in the following journal.

Name: Croatian medical journal
ISSN: 1332-8166
Pages: 164-170


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Medical and Biotech [MESH] Definitions

The amount of force generated by MUSCLE CONTRACTION. Muscle strength can be measured during isometric, isotonic, or isokinetic contraction, either manually or using a device such as a MUSCLE STRENGTH DYNAMOMETER.

The amount of mineral per square centimeter of BONE. This is the definition used in clinical practice. Actual bone density would be expressed in grams per milliliter. It is most frequently measured by X-RAY ABSORPTIOMETRY or TOMOGRAPHY, X RAY COMPUTED. Bone density is an important predictor for OSTEOPOROSIS.

A device that measures MUSCLE STRENGTH during muscle contraction, such as gripping, pushing, and pulling. It is used to evaluate the health status of muscle in sports medicine or physical therapy.


Removal of mineral constituents or salts from bone or bone tissue. Demineralization is used as a method of studying bone strength and bone chemistry.


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