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Related Concept Videos

Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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Evaluating tibial rotation in recurrent patellar dislocation with four-dimensional computed tomography.

Kazuya Kaneda1, Kengo Harato2, Satoshi Oki1

  • 1Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo, 160-8582, Japan.

Skeletal Radiology
|November 15, 2024
PubMed
Summary

Patients with recurrent patellar dislocation show altered knee joint motion, with the tibia externally rotating earlier during knee extension compared to healthy knees. This impacts patellar tracking and knee kinematics.

Keywords:
3D joint kinematics4DCTRecurrent patellar dislocationTibial external rotation

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Medical Imaging

Background:

  • Recurrent patellar dislocation is a common knee injury affecting joint stability and function.
  • Understanding the three-dimensional (3D) kinematic changes during knee motion is crucial for effective treatment.

Purpose of the Study:

  • To investigate the 3D kinematic differences in the knee joint of patients with recurrent patellar dislocation compared to controls.
  • To analyze patellar and tibial motion during knee extension using four-dimensional computed tomography (4DCT).

Main Methods:

  • Analysis of ten knees with recurrent patellar dislocation and seven control knees using 4DCT.
  • Patients performed knee extension from 60° flexion to full extension over 10 seconds.
  • 3D-3D surface registration was employed to evaluate patellar and tibial angles relative to the femur.

Main Results:

  • The patellar lateral tilt increased with knee extension in the dislocation group.
  • Significant differences in patellar tilt were observed between groups at 0°-20° knee flexion.
  • The tibia exhibited external rotation during knee extension in the dislocation group, with significant differences noted at 0°-10° flexion.

Conclusions:

  • Patients with recurrent patellar dislocation demonstrate distinct tibial external rotation patterns compared to controls.
  • Tibial external rotation initiates earlier in the knee extension phase for individuals with recurrent patellar dislocation.
  • These findings offer novel insights into knee kinematics, potentially guiding future therapeutic interventions for patellar instability.