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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...
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: May 23, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Alignment changes due to incomplete component seating in total knee arthroplasty.

H John Cooper1

  • 1Department of Orthopaedic Surgery, Lenox Hill Hospital, William Black Hall, 130 East 77th St, New York, NY 10075, USA.

The Journal of Arthroplasty
|April 7, 2012
PubMed
Summary

Restoring the mechanical axis is key in total knee arthroplasty. Even minor asymmetrical component seating (1-5 mm) can significantly alter knee alignment, impacting surgical outcomes.

Related Experiment Videos

Last Updated: May 23, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Medical Device Technology

Background:

  • Total knee arthroplasty (TKA) aims to restore the native knee's mechanical axis for optimal function.
  • Component alignment is critical for long-term TKA success and patient satisfaction.
  • Deviations from ideal alignment can arise from various surgical factors, including component placement.

Purpose of the Study:

  • To quantify the impact of incomplete asymmetrical component seating on coronal alignment in TKA.
  • To provide surgeons with data on expected alignment changes due to component malpositioning.
  • To enhance intraoperative decision-making regarding component seating in TKA.

Main Methods:

  • Trigonometric analysis was employed to model component seating variations.
  • Simulations were performed to assess alignment changes based on seating depth (1-5 mm) and asymmetry.
  • The influence of femoral and tibial component size on alignment deviation was considered.

Main Results:

  • Incomplete seating of 1 to 5 mm can lead to coronal alignment changes ranging from 0.7° to 4.9°.
  • The degree of alignment alteration is dependent on the extent of asymmetry and component size.
  • This variability highlights the sensitivity of coronal alignment to precise component placement.

Conclusions:

  • Even subtle degrees of incomplete asymmetrical component seating can significantly alter the coronal alignment in TKA.
  • Surgeons must be aware of these potential alignment shifts during intraoperative assessments.
  • Accurate component seating is crucial for achieving the primary goal of mechanical axis restoration in TKA.