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Cancellous bone support for patellar resurfacing.

R G Josechak, J B Finlay, R B Bourne

    Clinical Orthopaedics and Related Research
    |July 1, 1987
    PubMed
    Summary
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    Sacrificing patellar subchondral bone weakens cancellous bone support. The study found no consistent strength patterns on patellar osteotomy surfaces, indicating fixation peg placement is not critical for bony support.

    Area of Science:

    • Orthopedic surgery
    • Biomechanical engineering
    • Human anatomy

    Background:

    • The patella's cancellous bone provides crucial support.
    • Understanding its compressive resistance is vital for orthopedic procedures.
    • Current literature lacks detailed topographic analysis of patellar cancellous bone strength.

    Purpose of the Study:

    • To quantify the compressive resistance of human patellar cancellous bone.
    • To investigate the influence of subchondral bone sacrifice on bone strength.
    • To determine the topographic strength patterns of cancellous bone post-osteotomy.

    Main Methods:

    • Nine fresh human patellar specimens were analyzed.
    • Radiographic assessment and standardized osteotomies were performed.

    Related Experiment Videos

  • Topographic compression testing utilized a Material Test System (MTS) Universal Testing Machine with a 4-mm indentor.

    • Main Results:

    • Sacrificing the subchondral bone significantly diminishes cancellous bone support.
    • Topographic strength patterns on the osteotomy surface were inconsistent.
    • No predictable relationship was found between strength patterns and the intracondylar eminence.

    Conclusions:

    • Fixation peg placement in patellar osteotomies is not critical for bony support strength.
    • The mechanical integrity relies heavily on intact subchondral bone.
    • Further research may explore alternative fixation strategies.