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Gait affects tibial component fixation.

M B Hilding1, L Ryd, S Toksvig-Larsen

  • 1Department of Orthopaedics, Central Hospital of Västerås, Sweden.

The Journal of Arthroplasty
|September 4, 1999
PubMed
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Good tibial component fixation after total knee arthroplasty is linked to smaller joint moments during walking. Poor fixation correlates with higher flexing moments, indicating gait impacts implant stability.

Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Biomedical engineering

Background:

  • Total knee arthroplasty (TKA) aims to restore function and reduce pain.
  • Long-term fixation of tibial components is crucial for TKA success.
  • Understanding factors influencing fixation is essential for improving patient outcomes.

Purpose of the Study:

  • To investigate the relationship between gait patterns and tibial component fixation in TKA patients.
  • To identify biomechanical differences associated with good versus poor fixation prognoses.

Main Methods:

  • Roentgen stereophotogrammetry (RSP) was used to classify fixation prognosis (good/poor) based on tibial component migration over 4-8 years.
  • Gait analysis using the Vicon system was performed on 27 asymptomatic TKA patients.

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  • Patients were selected to form two equivalent groups with differing fixation prognoses.

    • Main Results:

    • The poor prognosis group exhibited a predominantly flexing knee moment and higher peak moments in the sagittal plane during gait.
    • The good prognosis group demonstrated abnormally small joint moments compared to the poor prognosis group.
    • Significant differences in gait biomechanics were observed between groups with distinct fixation outcomes.

    Conclusions:

    • Individual gait patterns significantly influence tibial component fixation after total knee arthroplasty.
    • Altered joint loading, characterized by specific moment patterns, affects the long-term stability of TKA implants.
    • These findings highlight the importance of biomechanical factors in TKA fixation success.