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Adynamic bone lesion in renal transplant recipients with normal renal function
F Velasquez-Forero1, A Mondragón, B Herrero
1Departamento de Patología, Mineral Hospital Mocel, México DF, México.
Summary
Adynamic bone lesion is common in kidney transplant recipients with normal renal function, leading to low bone mineral density. Long-term glucocorticoid use and iron deposits may contribute to this condition.
Area of Science:
- Nephrology
- Endocrinology
- Bone Metabolism
Background:
- Adynamic bone lesion is characterized by low bone turnover, normal or low osteoid volume, and decreased bone formation rate (BFR).
- Kidney transplant recipients often experience bone complications, even with normal renal function.
- Evaluating bone health in these patients is crucial for long-term outcomes.
Purpose of the Study:
- To assess bone mineral density and characterize bone lesions in asymptomatic kidney transplant recipients with normal renal function.
- To investigate the relationship between immunosuppressive therapy, biochemical markers, and bone histomorphometry.
- To identify potential contributing factors to adynamic bone lesions in this population.
Main Methods:
- Prospective cross-sectional study involving 16 kidney transplant recipients.
- Bone densitometry (hip and lumbar spine), serum parathyroid hormone (PTH), urine cAMP, and bone biopsies were performed.
- Histomorphometric analysis evaluated osteoid volume, mineralization, and bone formation rate.
Main Results:
- Bone densitometry revealed significantly lower bone mineral density (osteopenia) in hip and lumbar spine compared to controls.
- Bone biopsies showed adynamic bone lesion in 12 out of 16 patients, characterized by decreased osteoid area and bone formation rate.
- Elevated serum PTH and urine cAMP indicated abnormalities in parathyroid function, despite normal renal function.
Conclusions:
- Adynamic bone lesion is prevalent in kidney transplant recipients with normal renal function, contributing to osteopenia.
- Long-term glucocorticoid use and iron deposits at the mineralization front may be associated factors.
- The coexistence of adynamic bone lesion and hyperparathyroid markers suggests complex pathogenetic mechanisms, possibly involving PTH receptor downregulation or bone microenvironment alterations.