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Bone oxalosis and renal osteodystrophy.

G Gherardi, A Poggi, S Sisca

    Archives of Pathology & Laboratory Medicine
    |February 1, 1980
    PubMed
    Summary
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    Calcium oxalate crystals deposit in bones of patients with hyperoxaluria undergoing hemodialysis. This crystal deposition worsens bone disease, including osteomalacia and hyperparathyroidism.

    Area of Science:

    • Nephrology
    • Orthopedics
    • Pathology

    Background:

    • Hyperoxaluria is a metabolic disorder leading to excessive oxalate production.
    • Patients with end-stage renal disease often undergo hemodialysis.
    • Bone complications are common in patients with chronic kidney disease and hyperoxaluria.

    Observation:

    • Bone biopsy specimens from four hemodialysis patients with hyperoxaluria were analyzed.
    • Calcium oxalate crystals were identified within bone marrow spaces, bone matrix, and osteoid tissue.
    • Crystals appeared as elongated empty spaces under electron microscopy and fragmented needle-like structures after hydrogen peroxide treatment.

    Findings:

    • Oxalate crystals aggregated in marrow spaces, eliciting a granulomatous reaction that did not clear the crystals.

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  • Histological examination revealed advanced renal osteodystrophy, characterized by severe osteomalacia and hyperparathyroidism.
  • The granulomatous reaction to oxalate crystals likely exacerbates existing hyperparathyroid bone disease.

    • Implications:

    • Understanding oxalate crystal deposition is crucial for managing bone disease in hyperoxaluric patients on dialysis.
    • The findings suggest a potential mechanism by which oxalate crystals worsen renal osteodystrophy.
    • Further research may explore strategies to mitigate oxalate crystal accumulation and its skeletal consequences.