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Related Experiment Video

Updated: Jun 22, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

Fixed- vs mobile-bearing total knee arthroplasty: does it make a difference?--a prospective randomized study.

Melvyn A Harrington1, William J Hopkinson, Patricia Hsu

  • 1Department of Orthopedic Surgery, Baylor College of Medicine, Houston, Texas 77030, USA.

The Journal of Arthroplasty
|June 26, 2009
PubMed
Summary

This study found no significant early functional outcome differences between fixed-bearing (FB) and rotating-platform (RP) total knee arthroplasty. Both designs demonstrated comparable results in range of motion and patient-reported scores.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Clinical outcomes research

Background:

  • Total knee arthroplasty (TKA) is a common procedure for end-stage knee osteoarthritis.
  • Prosthetic design, including fixed-bearing (FB) and rotating-platform (RP) options, may influence early functional recovery.
  • Understanding the comparative early clinical results of different TKA designs is crucial for surgical decision-making.

Purpose of the Study:

  • To compare the early clinical and functional outcomes of primary total knee arthroplasty (TKA) utilizing fixed-bearing (FB) versus rotating-platform (RP) prostheses.
  • To evaluate differences in range of motion (ROM), patient-reported scores (Knee Society Score, WOMAC, SF-36), and radiographic findings between FB and RP TKA.
  • To determine if the choice of bearing design impacts short-term functional results after TKA.

Related Experiment Videos

Last Updated: Jun 22, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

Main Methods:

  • Prospective, randomized study design involving 72 FB knees and 68 RP knees.
  • Comprehensive outcome assessments including ROM, Knee Society Score, Western Ontario MacMaster (WOMAC) index, and Short Form-36 (SF-36) questionnaire.
  • Data collection at multiple time points: preoperatively and at 6 weeks, 3 months, 6 months, 1 year, and 2 years post-surgery.
  • Radiographic analysis to assess implant positioning and potential complications.

Main Results:

  • The rotating-platform (RP) group showed a statistically greater range of motion (ROM) at 6 weeks and 1 year post-surgery compared to the fixed-bearing (FB) group.
  • This ROM difference between RP and FB groups was not statistically significant at the 2-year follow-up.
  • No significant differences were observed in Knee Society Score, WOMAC, or SF-36 scores between the FB and RP groups at any measured time point.
  • Radiographic analysis revealed no clinically significant differences between the two prosthetic designs.

Conclusions:

  • The choice between fixed-bearing (FB) and rotating-platform (RP) designs in primary total knee arthroplasty (TKA) did not lead to significant differences in early functional outcomes.
  • While a transient ROM advantage was noted for RP designs, overall clinical and patient-reported outcomes were comparable between FB and RP TKA up to two years.
  • Current evidence suggests that both FB and RP TKA designs provide similar early functional results, indicating that other factors may be more critical in optimizing patient outcomes.