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Knee Joint

Knee Joint

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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Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach

Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach

Published on: January 24, 2018

Medial pivot total knee arthroplasty.

Ahab G Alnemri¹, Ryan Turlip¹, Amanda Moser¹

¹Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA.

Journal of Clinical Orthopaedics and Trauma

|October 27, 2025

Summary

Medial pivot total knee arthroplasty (MP-TKA) offers improved knee kinematics, showing promising survivorship and patient satisfaction. However, further research is needed to confirm long-term clinical benefits and address revision rate variations.

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Area of Science:

Orthopedic surgery
Biomechanical engineering
Knee joint kinematics

Background:

Medial pivot total knee arthroplasty (MP-TKA) designs aim to mimic native knee function.
Evolution from traditional designs to modern ball-and-socket concepts.

Purpose of the Study:

To review the biomechanical rationale behind MP-TKA.
To analyze current literature on MP-TKA survivorship and patient satisfaction.

Main Methods:

Literature review of biomechanical studies, clinical series, registries, and randomized trials.
Analysis of fluoroscopic and motion capture investigations.

Main Results:

MP-TKA demonstrates improved sagittal-plane stability and reduced anterior translation.
Patient-reported outcomes and survivorship are comparable or superior to traditional TKA in many studies.
Some MP implants show higher revision rates, influenced by design, technique, and patient selection.

Conclusions:

MP-TKA exhibits favorable in vivo performance and kinematics.
Long-term, large-scale studies are necessary to validate clinical benefits.
Surgeons should consider design variations, surgical technique, and patient selection for MP-TKA.