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Patellofemoral abnormalities in renal osteodystrophy

M E Kricun, D Resnick

    Radiology
    |June 1, 1982
    PubMed
    Summary

    Renal osteodystrophy can cause knee abnormalities, specifically in the patellofemoral joint. These changes, including joint space narrowing and erosions, may lead to restricted motion and synovitis.

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    Area of Science:

    • Nephrology
    • Orthopedics
    • Radiology

    Background:

    • Renal osteodystrophy is a common complication in patients with chronic kidney disease.
    • It affects bone metabolism, leading to various skeletal abnormalities.
    • Patellofemoral joint involvement has been less frequently described.

    Purpose of the Study:

    • To describe the characteristic abnormalities of the patellofemoral compartment in patients with renal osteodystrophy.
    • To correlate imaging findings with clinical manifestations.
    • To elucidate the potential mechanism of these joint alterations.

    Main Methods:

    • Retrospective analysis of imaging studies (e.g., X-rays, MRI) of seven patients with diagnosed renal osteodystrophy.
    • Clinical data review including joint motion, pain, and presence of synovitis.
    • Correlation of radiographic findings with underlying bone pathology (osteomalacia, osteitis fibrosa cystica).

    Main Results:

    • Observed characteristic patellofemoral abnormalities: narrowing of the patellofemoral space and ill-defined osseous erosions on the posterior patella.
    • Similar erosions were noted on the anterior femur in some cases.
    • Clinical symptoms included restricted joint motion and traumatic synovitis with joint effusion.

    Conclusions:

    • Renal osteodystrophy can manifest with distinct patellofemoral joint abnormalities.
    • The mechanism likely involves subchondral fractures due to weakened bone from osteomalacia or osteitis fibrosa cystica.
    • Calcium pyrophosphate dihydrate crystal deposition is not necessary for these findings.

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