Bone mineral density and bone turnover in spinal osteoarthrosis

Area of Science:

• Bone biology and metabolic diseases
• Rheumatology and skeletal health
• Geriatric medicine and aging

Background:

• Osteoarthritis (OA) is a common degenerative joint disease.
• Osteoporosis is characterized by low bone mineral density (BMD) and increased fracture risk.
• The relationship between spinal OA and osteoporosis is not fully understood.

Purpose of the Study:

• To investigate if spinal osteoarthritis is associated with generalized increased bone mineral density.
• To explore the underlying mechanism, specifically bone turnover rates, potentially explaining a protective effect against osteoporosis.

Main Methods:

• Study included 375 women aged 50-85 from a population-based cohort.
• Spinal OA diagnosed via radiographs based on degenerative joint changes.
• Bone mineral density (BMD) measured at lumbar spine, femoral neck, and total body using dual-energy X-ray absorptiometry.
• Biochemical markers of bone formation (serum bone-specific alkaline phosphatase - BAP) and resorption (urine deoxypyridinoline - Dpyr) assessed.

Main Results:

• Women with spinal OA exhibited significantly higher BMD at all measured sites (lumbar spine, total body, femoral neck).
• Adjusted urinary deoxypyridinoline and serum BAP levels were 19% lower in women with spinal OA, indicating reduced bone turnover.
• These findings were statistically significant with reported confidence intervals.

Conclusions:

• Spinal osteoarthritis is associated with a generalized increase in bone mineral density.
• The observed decrease in bone turnover markers suggests a potential mechanism for this protective effect against osteoporosis.
• Reduced bone turnover may mediate the protective role of spinal OA in preventing osteoporosis.