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Updated: May 22, 2026

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

Published on: November 23, 2019

Identifying alignment parameters affecting implanted patellofemoral mechanics.

Clare K Fitzpatrick1, Mark A Baldwin, Chadd W Clary

  • 1Computational Biomechanics Lab, University of Denver, 2390 S. York St., Denver, Colorado, USA.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|May 10, 2012
PubMed
Summary
This summary is machine-generated.

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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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Implant alignment significantly impacts patellofemoral joint function after knee replacement. Specific alignment parameters are critical for different patellar component designs, influencing joint mechanics and potentially reducing revision surgery rates.

Area of Science:

  • Biomechanics
  • Orthopedic surgery
  • Medical device engineering

Background:

  • Patellofemoral (PF) joint complications are a frequent reason for total knee replacement revision.
  • Improper femoral and patellar component alignment is linked to PF complications like maltracking and implant failure.

Purpose of the Study:

  • To investigate the relationship between implant alignment parameters and PF joint kinematics, contact mechanics, and internal stresses.
  • To identify critical alignment parameters for different patellar component designs using a dynamic finite element model and probabilistic simulation.

Main Methods:

  • Dynamic finite element modeling of an implanted PF joint.
  • Probabilistic simulation coupled with sensitivity and principal component analysis.
  • Evaluation of three patellar designs: dome, modified dome, and anatomic.

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Last Updated: May 22, 2026

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Main Results:

  • Femoral internal-external (I-E) alignment critically affects medial-lateral contact force and anterior-posterior translation for all designs.
  • Anatomic designs are sensitive to patellar flexion-extension (F-E) alignment; dome designs are more sensitive to translational position.
  • Modified dome designs show sensitivity to superior-inferior, F-E, and I-E alignments.

Conclusions:

  • Understanding design-specific alignment dependencies is crucial for improving preoperative planning.
  • Focusing instrumentation design on critical alignment parameters can enhance total knee replacement outcomes.
  • This research provides insights into optimizing PF joint mechanics through precise component alignment.