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Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
Published on: May 8, 2014
Mid-term survivorship results for a rotating-platform knee prosthesis
Wayne M Goldstein1, Alexander C Gordon, Ari Youderian
1Illinois Bone and Joint Institute, Morton Grove, IL, USA.
Orthopedics
|January 8, 2011
Summary
Mobile-bearing knee prostheses show promising mid-term results. This study confirms their safety and function, with low complication rates and excellent patient outcomes, comparable to fixed-bearing designs.
Area of Science:
- Orthopedic surgery
- Biomaterials engineering
- Medical device technology
Background:
- Increasing interest in mobile-bearing knee prostheses in the US market.
- Mobile-bearing systems offer rotational freedom, potentially improving kinematics.
- Concerns exist regarding spinout and long-term stability.
Purpose of the Study:
- Evaluate the function and safety of a specific mobile-bearing knee prosthesis.
- Assess the incidence of spinout and other complications.
- Compare mid-term outcomes with fixed-bearing equivalents.
Main Methods:
- Prospective study of 435 knees with a mobile-bearing system (cobalt-chrome tray, polyethylene insert).
- Survivorship analysis and complication reporting over 2-5 years.
- Clinical evaluations included radiographs and Knee Society scores.
Main Results:
- Average flexion of 125° and high Knee Society scores (88/100 for knee, 83/100 for function).
- Radiographic assessment showed 97.3% normal findings; few complications noted (e.g., patella stress fracture).
- No spinout complications were reported.
Conclusions:
- The mobile-bearing knee prosthesis demonstrated safe and effective mid-term function.
- Outcomes in survivorship, function, and patient satisfaction are equivalent to fixed-bearing designs.
- This mobile-bearing system addresses concerns regarding spinout in knee arthroplasty.