Assessing the Balance of Bone Formation and Resorption Through Reference Turnover Markers
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By
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Albert Shieh
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Arun S Karlamangla
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Fatma Gossiel
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Richard Eastell
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Sherri-Ann Burnett-Bowie
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Gail A Greendale
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December 5, 2024
Clinical Scorecard: Assessing the Balance of Bone Formation and Resorption Through Reference Turnover Markers
At a Glance
| Category | Detail |
|---|
| Condition | Bone turnover imbalance during menopause transition |
| Key Mechanisms | Bone resorption and formation markers combined to estimate bone balance via Bone Balance Index (BBI) |
| Target Population | Women transitioning through menopause |
| Care Setting | Community-based cohort study with clinical and research applications |
Key Highlights
- Bone resorption marker CTX and formation marker PINP combined to create BBI reflecting net bone balance.
- More negative BBI values predict faster bone mineral density (BMD) loss at lumbar spine and femoral neck.
- Individual markers CTX or PINP alone reflect overall bone turnover and higher levels associate with greater BMD decline.
Guideline-Based Recommendations
Diagnosis
- Use serum collagen type I C-telopeptide (CTX) and procollagen type I N-terminal propeptide (PINP) as reference bone turnover markers for assessment.
Management
- Combine CTX and PINP measurements to calculate Bone Balance Index (BBI) for estimating net bone formation versus resorption.
- Monitor BBI to predict rates of bone mineral density loss during menopause transition.
Monitoring & Follow-up
- Serial assessments of CTX and PINP are recommended due to their sensitivity and lower variability compared to older markers.
- Track annualized changes in lumbar spine and femoral neck BMD in relation to BBI values.
Risks
- Higher bone turnover indicated by elevated CTX or PINP levels is associated with increased risk of bone loss.
- Negative BBI values indicate unfavorable bone balance and faster BMD decline.
Patient & Prescribing Data
Community-dwelling women aged 42-52 years transitioning through menopause
BBI can serve as a noninvasive biomarker to guide interventions aimed at preserving bone density by identifying imbalance in bone turnover.
Clinical Best Practices
- Utilize serum CTX and PINP as standardized markers for bone turnover assessment in menopausal women.
- Calculate and interpret BBI to estimate net bone formation relative to resorption for individualized risk stratification.
- Incorporate BBI monitoring in longitudinal care to predict and potentially mitigate bone mineral density loss.
References
