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Related Concept Videos

Knee Joint01:23

Knee Joint

1.3K
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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Articulations of the Vertebral Column01:28

Articulations of the Vertebral Column

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In addition to being held together by the intervertebral discs, adjacent vertebrae also articulate with each other at synovial joints formed between the superior and inferior articular processes called zygapophysial joints (facet joints). These are plane joints that provide for only limited motions between the vertebrae. The orientation of the articular processes at these joints varies in different regions of the vertebral column and serves to determine the types of motions available in each...
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Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
3.2K
Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary...
2.0K
Structural Joints: Fibrous Joints01:03

Structural Joints: Fibrous Joints

1.9K
Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
1.9K
Functional Classification of Joints01:09

Functional Classification of Joints

3.7K
Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
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Related Experiment Video

Updated: May 16, 2025

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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Sacroiliac Joint: Mimics and Pitfalls.

Mary K Jesse Lowry1, Mary Elizabeth Buchanan1

  • 1Department of Radiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado.

Seminars in Musculoskeletal Radiology
|March 31, 2025
PubMed
Summary

This review clarifies sacroiliac joint (SIJ) pathology, differentiating common and rare disorders from axial spondyloarthritis. Understanding SIJ anatomy and imaging is key for accurate diagnosis.

Area of Science:

  • Rheumatology
  • Radiology
  • Anatomy

Background:

  • Sacroiliac joint (SIJ) pathology poses diagnostic challenges due to varied mechanical and inflammatory conditions.
  • Axial spondyloarthritis-related sacroiliitis is a recognized pathology, but other conditions mimic its presentation and imaging.
  • Accurate differentiation is crucial for effective patient management.

Purpose of the Study:

  • To review the anatomical features of the SIJ relevant to pathology.
  • To detail imaging findings (MRI, CT, radiography) for various SIJ conditions.
  • To provide a framework for distinguishing SIJ disorders from axial spondyloarthritis.

Main Methods:

  • Anatomical review of SIJ morphology, ligaments, and histology.
  • Comprehensive analysis of imaging findings across multiple modalities.

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  • Comparative assessment of pathologies mimicking axial spondyloarthritis.

    • Main Results:

    • Detailed description of SIJ anatomy aids in understanding pathology.
    • Specific imaging features are presented for differentiating conditions.
    • A framework is established to distinguish SIJ disorders from axial spondyloarthritis.

    Conclusions:

    • Enhanced understanding of SIJ anatomy and imaging improves diagnostic accuracy.
    • Distinguishing diverse SIJ pathologies from axial spondyloarthritis is achievable.
    • This review offers insights into anatomical nuances impacting clinical and imaging assessments.