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Related Experiment Videos

Nonconstrained implants in revision total knee arthroplasty

Y Takahashi1, R B Gustilo

  • 1Minneapolis Orthopaedic and Arthritis Institute, MN.

Clinical Orthopaedics and Related Research
|December 1, 1994
PubMed
Summary

Revision total knee arthroplasty using modular prostheses showed satisfactory early results, improving patient function and pain scores. This approach aids in managing complex cases with bone loss and instability.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Revision total knee arthroplasty (TKA) presents significant challenges, including bone loss and ligamentous instability.
  • Modular prosthesis systems offer advantages in preoperative planning and intraoperative adaptability for complex revisions.

Purpose of the Study:

  • To evaluate the early outcomes of revision total knee arthroplasty using a modular semiconstrained prosthesis system.
  • To assess the effectiveness of modular prostheses in addressing challenges like bone loss and instability in revision TKA.

Main Methods:

  • A study of 39 knees in 36 patients undergoing revision TKA between March 1989 and March 1992.
  • Utilized posterior stabilized modular prostheses (31 knees) and standard condylar modular prostheses (8 knees).
  • Follow-up averaged 20 months, with analysis of radiographic parameters, clinical scores, and complications.

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Main Results:

  • Improved mean tibiofemoral angle from 2.1° valgus preoperatively to 5.9° valgus postoperatively.
  • Significant improvements in Knee Society Pain Score (50.5 to 82.7) and Function Score (35.5 to 56.1).
  • Complications occurred in 20.5% of cases, with one late failure due to infection leading to knee fusion.

Conclusions:

  • Modular semiconstrained systems provide satisfactory early results for revision total knee arthroplasty.
  • These systems facilitate management of complex revision TKA cases, improving alignment and patient-reported outcomes.
  • Despite challenges, modular TKA offers a viable solution for complex knee revisions.