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Related Experiment Videos

Symmetrical vs asymmetrical total knee replacement--a medium term comparative analysis.

T Ashraf1, D J Beard, J H Newman

  • 1Avon Orthopaedic Centre, Winford Unit, Southmead Hospital, Westbury-on-Trym, Bristol BS10 5NB, UK. stashraf@hotmail.com

The Knee
|March 22, 2003
PubMed
Summary
This summary is machine-generated.

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The Kinemax plus knee replacement, featuring a symmetrical femoral component, significantly improved range of motion and reduced patello-femoral complications compared to the original Kinematic design. This modification offers enhanced outcomes for total knee replacement patients.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Medical Device Design

Background:

  • Implant modifications can lead to adverse effects, necessitating careful design evaluation.
  • Previous hip implant modifications (Capitol, matt coated Exeter) demonstrated potential risks.
  • The Kinemax plus modification aimed to mitigate patello-femoral complications in total knee replacements.

Purpose of the Study:

  • To compare the outcomes of the Kinematic knee with its modified version, the Kinemax plus.
  • To evaluate the impact of design changes (broader trochlear, offset patella, symmetrical femoral component) on knee function.
  • To assess patello-femoral tracking and range of movement post-total knee replacement.

Main Methods:

  • Comparative analysis of prospective data from 182 total knee replacements (95 Kinematic, 87 Kinemax plus) between 1991-1993.

Related Experiment Videos

  • Standardized surgical technique and instrumentation were used for all procedures.
  • Patients were reviewed at 5 years using the Bristol knee score and radiographic assessment.

    • Main Results:

    • No significant difference in overall Bristol knee scores between the two prosthesis groups (85-86).
    • The Kinemax plus group showed a significantly greater improvement in range of movement (14 vs. 4 degrees; P<0.05).
    • Secondary interventions for mal-tracking were significantly reduced in the Kinemax plus group.

    Conclusions:

    • The Kinemax plus modification, with its symmetrical femoral component and offset patella, effectively reduced patello-femoral complications.
    • The design changes did not introduce any detectable deleterious effects.
    • This modification represents a safe and effective advancement in total knee replacement technology.