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Related Concept Videos

Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

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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...
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Knee Joint01:23

Knee Joint

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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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Related Experiment Video

Updated: May 4, 2026

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
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MRI after patellofemoral replacement: the component-bone interface and rotational alignment.

Thomas J Heyse1, Jens Figiel2, Ulrike Hähnlein1

  • 1Department of Orthopedics and Rheumatology, University Hospital Marburg, Baldingerstrasse, 35043 Marburg, Germany.

HSS Journal : the Musculoskeletal Journal of Hospital for Special Surgery
|January 16, 2014
PubMed
Summary

Tailored magnetic resonance imaging (MRI) reliably assesses the implant-bone interface and component alignment after patellofemoral replacement (PFR). This technique aids in evaluating painful PFR outcomes.

Keywords:
MRIPFJPFRcomponent–bone interfacekneepatellofemoral replacement

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Area of Science:

  • Orthopedic surgery
  • Medical imaging

Background:

  • Previous research demonstrated tailored MRI's reproducibility for knee joint structures post-patellofemoral replacement (PFR).
  • This study builds upon prior work to assess specific implant-related parameters.

Purpose of the Study:

  • To evaluate the reliability of tailored MRI for assessing the implant-bone interface of femoral and patellar components after PFR.
  • To determine the reliability of tailored MRI in evaluating the rotational alignment of the femoral component post-PFR.
  • To assess the confidence levels of investigators in these evaluations.

Main Methods:

  • Tailored MRI scans were performed on seven patients following PFR, with techniques to minimize metallic artifacts.
  • Two independent investigators assessed the implant-bone interface and femoral component rotational alignment.
  • Inter-observer reliability and investigator confidence were quantified using a five-point scale.

Main Results:

  • Minimal MRI artifacts were observed, allowing clear evaluation of the component-bone interface.
  • Excellent inter-observer reliability and agreement were achieved for both implant-bone interface assessment and rotational alignment.
  • The scoring system used for interface evaluation proved reliable.

Conclusions:

  • Tailored MRI provides reproducible analysis of the implant-bone interface and femoral component rotational alignment after PFR.
  • This imaging method shows promise for assessing patients experiencing pain after PFR.
  • The technique enhances diagnostic capabilities in post-operative orthopedic care.