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Related Experiment Videos

Tibial component positioning in total knee arthroplasty: bone coverage and extensor apparatus alignment

P Lemaire1, D P Pioletti, F M Meyer

  • 1Hôpital Orthopédique de la Suisse Romande, Lausanne, Switzerland.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|January 1, 1997
PubMed
Summary

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Choosing the right tibial tray in total knee arthroplasty (TKA) is key. A symmetrical tray offers a better balance between bone coverage and patellofemoral tracking than an asymmetrical one.

Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical device design

Background:

  • Optimal tibial component placement in total knee arthroplasty (TKA) requires balancing bone coverage and patellofemoral tracking.
  • Tibial tray positioning is influenced by tibial torsion and bone resection levels.

Purpose of the Study:

  • To quantify the torsional profile for optimal bone coverage using symmetrical and asymmetrical tibial trays.
  • To compare the compromise between bone coverage and patellofemoral tracking for different tibial tray designs.

Main Methods:

  • Quantified torsional profiles for optimal bone coverage with symmetrical and asymmetrical tibial trays.
  • Measured angle differences between optimal bone coverage and tibial tubercle alignment.
  • Assessed the compromise between bone coverage and patellofemoral tracking for each tray type.

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Main Results:

  • Symmetrical tibial trays showed more scattered torsional profiles compared to asymmetrical ones.
  • The symmetrical prosthetic tray provided a better compromise between optimal bone coverage and satisfactory patellofemoral tracking.
  • Asymmetrical trays encountered more difficulty in achieving this compromise.

Conclusions:

  • Symmetrical tibial trays may offer a superior compromise for achieving both optimal bone coverage and good patellofemoral tracking in TKA.
  • The inherent asymmetry of the tibiofemoral joint presents challenges for asymmetrical tray designs in TKA.