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Patellar instability in juvenile amputees.

J B McIvor, R Gillespie

    Journal of Pediatric Orthopedics
    |September 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Juvenile amputees may develop patellar instability due to prosthesis use. Below-knee amputations and longer prosthesis wear correlate with patella alta, a precursor to patellar instability.

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    Area of Science:

    • Orthopedics
    • Biomedical Engineering
    • Pediatric Sports Medicine

    Background:

    • Juvenile amputees often experience knee issues.
    • Patellar instability and patellofemoral pain are common concerns in this population.
    • The relationship between amputation, prosthesis use, and patellar mechanics requires further investigation.

    Purpose of the Study:

    • To assess the prevalence and characteristics of patellar instability in juvenile amputees.
    • To identify radiographic indicators associated with patellar instability in this cohort.
    • To explore potential etiological factors linking prosthesis use to patellar abnormalities.

    Main Methods:

    • Radiographic evaluation of 43 ipsilateral knees in 41 juvenile amputees.
    • Assessment of patellar alignment, morphology, and position (patella alta, lateral subluxation, hypoplasia).

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  • Correlation analysis between amputation cause, prosthesis wear duration, and observed patellar abnormalities.

    • Main Results:

    • Eleven patients (25.6%) exhibited patellar instability, and three (7%) had patellofemoral pain.
    • Symptomatic patients frequently presented with patella alta, lateral patellar subluxation, and hypoplastic patellae.
    • Asymptomatic patients also showed high rates of patella alta (68%) and hypoplasia (35%).
    • Patella alta was more common in patients with below-knee amputations and longer prosthesis wear duration.

    Conclusions:

    • Patella alta and hypoplastic patellae are common radiographic findings in juvenile amputees, regardless of symptoms.
    • Prosthesis pressure on the patellar tendon is hypothesized to contribute to patella alta.
    • These findings suggest that patella alta may predispose juvenile amputees to patellar instability and pain.