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Related Concept Videos

Knee Joint01:23

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 group...
Muscles that Move the Leg01:23

Muscles that Move the Leg

The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
Anterior Compartment
The quadriceps femoris, the most visible muscle of the anterior compartment, is integral for leg extension and thigh flexion. It is formed by merging four distinct muscles — the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The quadriceps tendon, a shared tendon of the four quadriceps muscles, is affixed to...
Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the neck...

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Related Experiment Video

Updated: Jun 9, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

Posterior dislocation in total knee replacement: a price for deep flexion?

Nele Arnout1, Hilde Vandenneucker, Johan Bellemans

  • 1Department of Orthopedics, Catholic University Leuven, Weligerveld 1, 3212, Pellenberg, Belgium. nelearnout@yahoo.com

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|September 8, 2010
PubMed
Summary

Posterior dislocation in total knee arthroplasty (TKA) can occur with posterior stabilized designs. Specific features in a high-flexion TKA design were linked to increased dislocation rates in four reported cases.

Related Experiment Videos

Last Updated: Jun 9, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Knee biomechanics

Background:

  • Posterior-cam dislocation is a rare but serious complication following total knee arthroplasty (TKA).
  • Posterior stabilized TKA designs aim to improve stability but can still be susceptible to dislocation.
  • Understanding the specific design elements contributing to this complication is crucial for improving patient outcomes.

Purpose of the Study:

  • To report on four cases of posterior tibial dislocation relative to the femur in a specific posterior stabilized TKA design.
  • To identify potential design-related factors contributing to dislocation in contemporary total knee arthroplasty.

Main Methods:

  • Case series review of four patients experiencing posterior dislocation after TKA.
  • Analysis of the specific design characteristics of the posterior stabilized TKA system used in these cases.
  • Biomechanical assessment of the implant design features implicated in dislocation.

Main Results:

  • Four instances of posterior dislocation were documented in patients with a particular posterior stabilized TKA.
  • The dislocations occurred with a contemporary high-flexion TKA design.
  • Specific design features of this TKA were identified as potential contributors to the observed dislocations.

Conclusions:

  • Certain design features within a contemporary high-flexion TKA system are associated with an elevated risk of posterior dislocation.
  • Implant design plays a significant role in the biomechanical stability of total knee arthroplasty.
  • Further investigation into TKA design modifications is warranted to minimize dislocation complications.