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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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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Bones have various surface features that help form joints and attach to other soft tissues. Depending on the function, bone markings are categorized into articulating projections, processes for attachment, depressions, and openings.
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Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
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Shape-based acetabular cartilage segmentation: application to CT and MRI datasets.

Pooneh R Tabrizi1, Reza A Zoroofi2, Futoshi Yokota3

  • 1Control and Intelligent Processing Center of Excellence, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran. proshani@ut.ac.ir.

International Journal of Computer Assisted Radiology and Surgery
|October 22, 2015
PubMed
Summary

A novel method accurately segments acetabular cartilage using shape and intensity data from CT arthrography and MRI. This approach shows superior performance, even with noisy data and damaged cartilage, highlighting its clinical potential.

Keywords:
Acetabular cartilageCT arthrographyGraph-CutK-OPLSMRIPelvic bone

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Orthopedics

Background:

  • Acetabular cartilage segmentation is crucial for diagnosing hip joint conditions.
  • Existing segmentation methods face challenges with accuracy and efficiency.

Purpose of the Study:

  • To develop and evaluate a new acetabular cartilage segmentation method.
  • To assess the method's performance using computed tomography (CT) arthrography and magnetic resonance imaging (MRI) datasets with leg tension.

Main Methods:

  • A novel segmentation approach combining shape and intensity information.
  • Shape acquisition based on the nonlinear relationship between the acetabulum and cartilage.
  • Automatic intensity information extraction for segmentation completion.
  • Evaluation on 54 CT arthrography and 20 MRI datasets.

Main Results:

  • The new method outperformed four existing segmentation techniques.
  • Achieved high accuracy across 74 datasets, irrespective of imaging modality.
  • Demonstrated efficiency in noisy conditions and accurate detection of zero-thickness damaged cartilage.
  • Required minimal user interaction for bone segmentation.

Conclusions:

  • The developed method offers robust acetabular cartilage segmentation using combined shape and intensity data.
  • Effective in datasets with clear acetabular and femoral cartilage boundaries.
  • Requires consistent data (CT arthrography or MRI with leg traction) for optimal pelvic bone and cartilage information.