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Related Concept Videos

Knee Joint01:23

Knee Joint

3.4K
The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
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Functional Classification of Joints01:09

Functional Classification of Joints

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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
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Related Experiment Video

Updated: Apr 23, 2026

Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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Mobile- vs. fixed-bearing total knee replacement.

Michael Tjørnild1, Kjeld Søballe, Per Møller Hansen

  • 1Department of Orthopedics, Horsens Regional Hospital, Horsens.

Acta Orthopaedica
|October 4, 2014
PubMed
Summary
This summary is machine-generated.

Mobile-bearing (MB) total knee arthroplasty showed less tibial implant migration than fixed-bearing (FB) designs at two years. While FB implants migrated more, this difference was not clinically significant, with both designs yielding similar patient outcomes.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Arthroplasty research

Background:

  • Tibial component loosening is a concern in total knee arthroplasty.
  • The comparative risk between mobile-bearing (MB) and fixed-bearing (FB) designs remains unclear.

Purpose of the Study:

  • To compare implant migration, bone mineral density (BMD), and patient-reported outcomes between MB and FB tibial components.
  • To investigate the P.F.C. Sigma Cruciate Retaining total knee arthroplasty in a randomized trial.

Main Methods:

  • A randomized study involving 50 osteoarthritis patients.
  • Allocation to either fixed-bearing (FB) or mobile-bearing (MB) tibial articulation.
  • Assessment of implant migration, periprosthetic BMD, and Oxford knee scores at 2-year follow-up.

Main Results:

  • Mean total translation (implant migration) was significantly higher for FB implants (0.30 mm) than MB implants (0.17 mm) at 2 years (p = 0.04).
  • Periprosthetic bone mineral density (BMD) showed a transient decrease at 1 year, returning near baseline by 2 years.
  • Both FB and MB designs resulted in comparable improvements in Oxford knee scores.

Conclusions:

  • Mobile-bearing tibial components demonstrated reduced implant migration compared to fixed-bearing designs.
  • The observed difference in migration was not clinically significant.
  • Mobile polyethylene may mitigate forces on the tibial tray, potentially reducing micromotion.